S15 6 Speed Transmission for Dummies [Archive] - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

View Full Version : S15 6 Speed Transmission for Dummies

xpertsnowcarver

01-13-2011, 02:41 AM

S15 6 Speed Manual Transmission (6MT)

***Sorry if the photos no longer show up. Photobucket turned into a real shitshow of a site and wants me to upgrade to a $400 account. I'll figure out how to host them somewhere else.

http://i561.photobucket.com/albums/ss56/xpertsnowcarver3/221-1.jpg
http://i561.photobucket.com/albums/ss56/xpertsnowcarver3/222-1.jpg
http://i561.photobucket.com/albums/ss56/xpertsnowcarver3/238.jpg
http://i561.photobucket.com/albums/ss56/xpertsnowcarver3/240.jpg
http://i561.photobucket.com/albums/ss56/xpertsnowcarver3/fsm1.jpg

Everything you wanted to know about the S15 6MT. A lot of this information is scattered all over the place. I'm just bring it together. I personally know quite a bit about the 6MT. I own and use two of them.

Please do not ruin this thread with a bunch of nonsense. Don't post information unless you are 100% positive that it is correct. Don't post how weak you think this transmission is, especially if you've never used or destroyed one yourself.. Any personal experience with this transmission is encouraged to be posted on this thread. For example, "XXXWHP and XXXWTQ, and I destroyed 3rd gear," or "XXXWHP and XXXWTQ, and she still kicks ass."

THE KA 5MT AND SR 5MT BELL HOUSINGS ARE NOT THE SAME.

I don't know everything, but I do know a lot. I'm not stubborn with what I am presenting to you. If you feel I posted incorrect or misleading information, I would be more than happy to hear you out and further research the issue.

To be covered:
- First look
- Comparison to the '5 Speed Manual Transmission' (5MT)
- Gearing and Specifications
- Gearing Comparison to the 5MT
- Necessities for Use
- VSS and Options
- Neutral Position and Reverse Switches
- Aftermarket Options
- Miscellaneous
- Final Notes
- Fitment on Other Engines
- Sources
- Post Notes

Pre-notes:
- I am strictly providing information regarding the S15 6MT for the SR engine. But, always take information as opinion anyway, and fact-check the information yourself.
- When I say 5MT, it is with assumption that it has a SR bell housing for the S13 and S14 SR engines and not a KA bell housing.
- When I am referring to a specific chassis, I will state so.
- I am strictly referring to OEM parts, excluding the 'Aftermarket Options' and 'Miscellaneous' sections.

Apparently the 6MT sycnromesh was designed by Borg Warner, just as the 5MT.
http://www.technolab.org/img/products/hako/hako1148.jpg

First Look
http://i561.photobucket.com/albums/ss56/xpertsnowcarver3/fsm2.jpg

Nissan guarantees that this transmission will not fail at or below an input torque of 209lb-ft.

This transmission was designed with a Dual-Mass flywheel in mind. Watch this video for an animation on how the dual-mass flywheel works. The first half shows how it is assembled. The last half shows how it works.

YnaXB8q3uzQ

Comparison to the 5MT
Similarities
- Bell housing pattern between the 6MT and 5MT are identical.
- The transmission mount is the same as the 5MT. However, the cross member is not the same.
- The slave cylinder, fork, pivot ball, release bearing, release bearing holder and pin all appear to be the same as the 5MT.
- The starters are identical between the S13-S15 SR engines.
- The 6MT clutch disc and pressure plate are similar to the 5MT. (NOTE: Because the 6MT uses a dual-mass flywheel, the OEM clutch disc is unsprung. The 5MT does not use a dual-mass flywheel, so the OEM clutch disc is sprung.)
- The output shaft to the driveshaft is the same as the 5MT.

http://i561.photobucket.com/albums/ss56/xpertsnowcarver3/230.jpg
http://i561.photobucket.com/albums/ss56/xpertsnowcarver3/232.jpg
http://i561.photobucket.com/albums/ss56/xpertsnowcarver3/235-1.jpg
Starters may appear different, but seem to mount and operate the same.

Differences
- The 6MT flywheel is much thicker than the 5MT. Consequentially, the bell housing is also deeper by the difference in thickness.
- The copper pilot bearing is located in the 6MT flywheel, rather than in the SR engine for the 5MT.
- The 6MT is divided into three sections, rather than two for 5MT. So, no! You cannot put a KA bell housing on a 6 speed.
- The 6MT shaft is slightly shorter than the 5MT shaft.
- The shifter and shifter plate are not the same between the 6MT and 5MT.
- Shift knob threading is wider, but have the same thread pitch. 6MT = M12x1.25. 5MT = M10x1.25.
- The Vehicle Speed Sensor (VSS) is located on the differential rather than the transmission.
- The 6MT cross-member is opposite of the 5MT. (The AT cross-member is closer to the 6MT, but still will not fit.)

http://i561.photobucket.com/albums/ss56/xpertsnowcarver3/224-1.jpg
Slight difference in spline thickness.

http://i561.photobucket.com/albums/ss56/xpertsnowcarver3/310.jpg
Thicker Flywheel. (In this picture, both the OEM S15 Dual-Mass Flywheel and Autech Flywheel are shown.)

http://i561.photobucket.com/albums/ss56/xpertsnowcarver3/307.jpg
This is the OEM Dual-Mass Flywheel with OEM Unsprung Disc and Pressure Plate. (If I recall correctly, the OEM Dual-Mass Flywheel weighs about 28lbs.)

http://i561.photobucket.com/albums/ss56/xpertsnowcarver3/237.jpg
6MT Crossmember and Nismo Transmission Mount

http://i561.photobucket.com/albums/ss56/xpertsnowcarver3/239.jpg
The 6MT bellhousing is noticeably deeper than the 5MT.

http://i561.photobucket.com/albums/ss56/xpertsnowcarver3/241.jpg
The shifter plate and assembly are completely different.

VSS and Options
As many of you have heard, yes, the VSS is located in the differential, rather than the transmission.

Some of you have speculated that some 6MTs have a plug covering what looks to possibly accommodate a VSS. This is true and false. Yes, the whole is the right size and shape. No, because the plastic gear that turns the VSS is absent from the output shaft. One would need to purchase the plastic gear (and a steel ball and c-clips that lock the gear in place) and dissemble the transmission to install it.

Some 6MTs don't have a plug. They may be cast molded shut.

http://i561.photobucket.com/albums/ss56/xpertsnowcarver3/243.jpg
http://i561.photobucket.com/albums/ss56/xpertsnowcarver3/245.jpg
Here we see one 6MT has a plug and the other does not.

So what are the VSS options?
1) Purchase and install the plastic gear (as mentioned above) and use the pertaining S13 or S14 VSS. This only works if you have a 6MT with plugged VSS slot.
2) Install a differential that has a VSS in it. This is not limited to the S15 differential. From what I've seen, a Q45 differential has a VSS and may be used.
3) Custom magnetic pick up or gear tooth pick up and sensor attached to the driveshaft.

So what are the signal modifier options for the speedometer to read appropriately?
If option 1, then you won't need anything. If you're using a S13 cluster, then use a S13 VSS. Likewise for the S14.
If option 2, you can either use the S15 ABS control unit (located next to the ECM) or use an aftermarket signal modifier such as the Dakota Digital box or Innovate DL-32.
If option 3, you will need an aftermarket signal modifier.

Neutral Position and Reverse Switches
http://i561.photobucket.com/albums/ss56/xpertsnowcarver3/wirings156speed.jpg
Wiring the transmission to continue using the reverse lights is very easy. No explanation should be needed here.

Gearing and Specifications
http://i561.photobucket.com/albums/ss56/xpertsnowcarver3/fsm3.jpg

Gearing Comparison to the 5MT
http://i561.photobucket.com/albums/ss56/xpertsnowcarver3/fsm4.jpg
http://www.nissans15.com/img/autech%20gear%20ratio.jpg
http://img.photobucket.com/albums/v731/XpertSnowCarver/rpm-vs-v.jpg
http://img.photobucket.com/albums/v731/XpertSnowCarver/v-vs-rpm-NISMO.jpg
***This last one I estimated where the Nismo 6MT gear ratio would be. The original can be found below.***

Necessities to Use a 6MT
For the SR engine ONLY.
- S15 Transmission Cross Member. The 5MT and AT cross members will not work.
- Transmission Mount. The 5MT and 6MT mounts are all the same.
- 6MT Flywheel. The 5MT flywheels will not work.
- Clutch Disc and Pressure Plate. Any clutch kit for the 5MT will work, but if one is using the OEM S15 Dual-Mass Flywheel, then feel free to get an unsprung clutch kit, even though this may be costly. Sourcing a new OEM replacement clutch kit is rather difficult to find. You can use a sprung clutch kit on the Dual-Mass flywheel, but the dampening will be overkill and shifting between gears may feel sloppy.
- Clutch fork, Release Bearing and Holder, pins, and slave cylinder. I am not 100% here, but they appear to be the same between the 5MT and 6MT.
- Driveshaft with S15 output. (Unsure, but the OEM S15 driveshaft may be used as long as the S15 or similar differential with VSS is used.)
- Shift knob with M12x1.25 threading. The 5MT shift knob won't fit because it is thinner, M10x1.25.

Notes: It is best to install the transmission and engine together. With the 6MT mounted on the engine, it will not touch hit the chassis. But, because it is still fatter than the 5MT, there is less room to muscle the 6MT on or off with the engine already mounted. Don't forget, the flywheel is about an inch thicker, which means you need to pull the transmission about an inch further back. That's never going to happen... I've tried; there is no room for removing and installing the 6MT separately from the engine.

Everything else is straight forward and no different than the 5MT. Be sure to torque all bolts down to spec. They will shear if you over tighten them.

Parts to Reference
http://img.photobucket.com/albums/v731/XpertSnowCarver/Partslist.jpg

Aftermarket Options
- Driveshafts. Driveshaftshop.com seems to be the place to go.
- Flywheels & Clutch Kits. This may get costly, but one can either source a used Autech flywheel (~$400), purchase a new JUN flywheel (~$700), or purchase a clutch kit that includes a new flywheel (~$1100+). The benefit of getting the Autech or JUN flywheels is that you can continue using a 5MT clutch kit, whereas a complete clutch kit such as the Nismo Coppermix may force you to stick with the same disc.
- Gears. Nismo, OS Giken, and possible others make gearing kits for this transmission. These kits are rated to withstand more power.
- Transmissions. Nismo and HKS make complete replacement transmissions. The Nismo transmission costs ~$3500, but only guarantees quality up to 298lb-ft. The HKS transmission costs ~$10500. Both, however, have different gear ratios compared to the S15 MT.

http://i561.photobucket.com/albums/ss56/xpertsnowcarver3/04765_2138_36009628.jpg
Comparison between the Nismo 6MT, S15 6MT, and 5MT.

http://img.photobucket.com/albums/v731/XpertSnowCarver/tran1.jpg
http://img.photobucket.com/albums/v731/XpertSnowCarver/tran2.jpg
http://img.photobucket.com/albums/v731/XpertSnowCarver/tran3.jpg
http://img.photobucket.com/albums/v731/XpertSnowCarver/tran4.jpg
Here are some more individual comparisons.

Miscellaneous
- Nismo 6th Main and Cross gear swap
http://i7.photobucket.com/albums/y274/xpertsnowcarver2/build/036.jpg
I swapped out the 6th gear on one of my 6MTs for track use. It brought the gearing much closer to 5th. (Gear Ratio changes from 0.764 to 0.8624)

- Closer look at Autech Flywheel
http://i561.photobucket.com/albums/ss56/xpertsnowcarver3/226.jpg
http://i561.photobucket.com/albums/ss56/xpertsnowcarver3/227-1.jpg
http://i561.photobucket.com/albums/ss56/xpertsnowcarver3/308.jpg
If I recall correctly, the OEM Dual-Mass Flywheel weighs about 28lbs, and the Autech Flywheels weighs about 17lbs. Also, the Autech flywheel was engineered by both Nismo and Exedy. Both of their stamps are on the flywheel. (The clutch disc pictured is the Fidanza 3.2 Clutch Kit).

Final Notes
Some of you guys jump the gun by saying, "forget the 6 speed, its weak anyway.." but most of you never used, touched, or seen a 6MT in your life. Don't continue making this your automatic response when the 6MT is mentioned.

How come this guy with 400WHP hasn't destroyed his 6MT when I only have 340WHP and destroyed mine in weeks???
Assuming you know how to shift, it just depends on two things.
- How much TORQUE are you putting out? Not horsepower... One guy may do 340WHP and have 280WTQ while another may have 340WHP and 320WTQ... (If the engine has a GT2871R, bigger intercooler, and injectors, then it should be fine. If you put a rebuilt the engine from scratch and/or put a 2.2L stroker kit, why didn't you buy a stronger transmission anyway? Even a 5 speed is a shitty tranny to mate with a built SR..)
- What are you using the transmission for? Drifting??? Drag???? This transmission isn't good for smashing gears like a mad man, especially with a very abrasive clutch. If you're engagements are smooth, the transmission will do fine. Most of you, and I mean 95% of you, aren't even close to 300whp. So destroying a 6MT transmission would be the last of your worries.

Nissan designed and guaranteed the quality of this transmission when torque input is no more than 209lb-ft. This is because Nissan (as well as any manufacturer) designed the transmission with a Factor of Safety or Margin. So, under normal conditions or even if one were to push an unmodified Spec-R to its limits, the transmission will not fail. (Assuming the tranny is well maintained.)

I estimate Nissan has a margin of AT LEAST 1.333, so one can expect an actual limit to failure to be a least 270lb-ft (emphasis on "at least", because I personally know someone with 270WTQ and has no problems what so ever). The gears are fragile to sudden impulses. To create an impulse, one could simply clutch kick or drop the clutch from a stand still, but you'd need some very sticky tires and a very abrasive clutch. If one were to transition smoothly between gears, no severe impulse made, and the oil used effectively fills the gaps between the teeth of the gears, then this transmission would be capable of at least 300WTQ. (These are all ball park estimates.) Anything after that, beyond me. Have heard of someone with 340WTQ and not having problems... but this is second/third hand information.

Keep in mind that the OEM S15 flywheel is a Dual-Mass flywheel. This flywheel significantly reduces an impulse, making engagement very smooth and allowing the gears to withstand more torque. The Dual-Mass flywheel is quite nice, especially with the unsprung clutch disc. I honestly cannot tell the difference between a dual-mass flywheel with an unsprung clutch kit versus a regular flywheel with a sprung clutch kit (aside from the difference in rev response). I think the dual-mass flywheel with, for example, with the Fidanza 5.4 unsprung clutch kit would be an awesome combination. With the OEM unsprung clutch kit, there is ZERO clutch chatter.

Fitment On Other Engines
- No.
Hahaha. This just isn't the transmission to bother with that. The amount of work it would take to re-center the input shaft of the 6MT to a KA engine, create a sandwich plate to marry the engine to the 6MT, make sure the clutch fork will pivot in the correct range to release the clutch disc, and align the starter to line up with the flywheel... you might as well do this for a sequential tranny, or some other heavier duty tranny.

Sources
- 1999-2002 Nissan Silvia S15 Factory Service Manual
- 1991-1994 Nissan 240SX Factory Service Manual
- Nissan S15 Specifications (http://www.nissans15.com/)
- Octane Report - Nismo 6MT Conversion (http://octanereport.com/tech/parts-reviews/2010/07/13/review-nismo-sr20det-reinforced-6-speed-transmission.html)
- Dual-Mass Flywheel assembly and functionality - Youtube
- NISMO | Silvia•180SX Reinforced Cross 6-Speed Transmission (http://www.nismo.co.jp/en/products/competition/mission/silvia.html)
- Gearing and Assembly Prices and Comparison (http://www.nismo.co.jp/en/products/competition/mission/pdf/silvia_price.pdf)
- Parts List and Prices per Chassis (http://www.nismo.co.jp/en/products/competition/mission/pdf/silvia_spec.pdf)

Post Notes
I think this transmission is a lot of fun to have, but not for drifting or drag racing. I use the transmission for road racing, and it has performed exceptionally well.

Again, please do not ruin this thread. Ask legitimate questions. Post solid facts and experience. If you have not used and/or destroyed this transmission, you're post/claim may not be valid to me.

Hope this helps a lot of you guys.

onehundredoctane

01-13-2011, 06:47 AM

Good info! Thanks for sharing!

Pure_JDM

01-13-2011, 07:10 AM

Thanks for sharing...

anton1o

01-13-2011, 07:25 AM

Amazing write up we don't even have this much info in AUS about the gearbox.

Thank You

Sent from my GalaxyS using Tapatalk

datsunnazi

01-13-2011, 08:21 AM

finally some reliable info... i was tired of just hearing, "those trannys are weak! just use a z32..." ghey...

slider2828

01-13-2011, 09:16 AM

Awesome write up! Always wondered about these nice little guys... I would love to have one...... Did you do the 6th gear yourself?

MisawaJason

01-13-2011, 10:11 AM

WOW, thanks for putting this out there in one place!!!

xpertsnowcarver

01-13-2011, 10:13 AM

No problem. There are some details I left out. I'll add them whenever I can recall them.

Awesome write up! Always wondered about these nice little guys... I would love to have one...... Did you do the 6th gear yourself?

Edit: Holy fuck... Completely misread your post.

Yes, I do have the Nismo 6th gear installed on one of my 6MTs.

xpertsnowcarver

01-15-2011, 01:04 AM

Finally found the other graphs. These are much better illustrations.

http://img.photobucket.com/albums/v731/XpertSnowCarver/rpm-vs-v.jpg
http://img.photobucket.com/albums/v731/XpertSnowCarver/v-vs-rpm.jpg

Edit: I added a line for the Nismo 6MT in the original post.

sidewaysil80

01-15-2011, 01:17 AM

THANK YOU! i just picked up a 6sp/s15 spec r motor and have been searching and searching for info. i do have a few questions for you though...

-do you know the part number or where to buy the s15 cross member?
-will the s13/s14 transmission mount fit on the s15 crossmember?
-does the 6spd use the same transmission fluid as the 5spds?

xpertsnowcarver

01-15-2011, 01:54 AM

-do you know the part number or where to buy the s15 cross member?
-will the s13/s14 transmission mount fit on the s15 crossmember?
-does the 6spd use the same transmission fluid as the 5spds?

1) 3137S-RRS50

2) Yes

3) Yes

~~~~~~~~~~~~~~~~~~~~~~~~~~~

Added a lot more information. More gear ratio comparisons and sources to reference.

dorkidori_s13

01-15-2011, 04:53 AM

i seriously <3 this thread...like A LOT!!!

awesome find in information man, threads like this should be made PERMANENT stickies!!! (ill recommend it for one actually)

ManoNegra

01-15-2011, 09:45 AM

Great info, props yo
I think an S15 SR w/ 6-speed tranny and mild boost upgrades would
make a killer daily

btw, how is the hand?

xpertsnowcarver

01-20-2011, 02:55 PM

Thanks :)

Hand is doing much better. It was a clean cut, so it healed very fast.

~~~~~~~~~~~~~~~~~~~~
Started using the dual-mass flywheel instead of the Autech flywheel. I must say, this flywheel is pretty cool. With the OEM clutch disc unsprung and letting the flywheel dampen the engagement, there is ZERO clutch chatter. I highly recommend it for daily driving. It may play a major roll in extending the life of your transmission.

If you increase your horsepower to +300whp/+240wtq and are still using the dual-mass flywheel, I would recommend the ACT 6 Puck unsprung clutch kit as a good replacement of the OEM unsprung clutch kit.

West

01-21-2011, 01:58 PM

Thread stuck due to pure awesomeness.

Om1kron

01-21-2011, 02:29 PM

dope ass post Joel.

Vatche

01-21-2011, 03:03 PM

i agree thread is overkill. haha.

xpertsnowcarver

01-21-2011, 06:11 PM

Awesome! Thanks for the sticky Mark. :D

Wayne, Vatche, thank you too. :)

BoostFiend510

01-28-2011, 09:43 AM

Great thread with great info! I have one of these bad boys if anybodys interested hmu!

DreamN

01-28-2011, 10:57 AM

No 6 speed to KA. You killed my dreams Joel. lol

Great tech thread. This is more of what Zilvia needs.

srkid50

02-10-2011, 11:24 PM

Really nice post. Had all the information I needed to hear. I am just curious..... if you have the time, you think you can research the HPI transmission? I hear that company took the NISMO tranny and made it stronger with less noise on the higher RPMs. I was reading it under RHDjapan.com.

Again, great job.

Oh, don't have a car yet but will be buying an S15 around April. Got to finish paying off debts first :). Driving a freaking Honda Accord for the time being just incase anyone was wondering what car I drove:(.

Jacks_s13

03-03-2011, 10:35 PM

So to put a SR20DET from a S15 into a S13 would require a S15 transmission crossmember, driveshaft, and a way to get the speedo sensor to work? and of course all the other usual stuff. I have heard you can use the stock S13 Crossmember.

FLMadness

04-20-2011, 10:12 AM

s14 slave cyl. works on a s15 as well. figured id add that since i just found out trying it myself

bornloser_182

04-28-2011, 07:58 PM

thanks for the goog thread

sidewaysil80

05-29-2011, 09:33 AM

xpertsnowcarver

05-29-2011, 01:38 PM

any options to tighten up the shifter? i know the hks springs arent compatible or the cusco shifter collar. are their any similiar options for the 6mt shifter? also, i noticed you said the oem clutch should be upgraded once you go above 300whp, but just how durable is it? i know thats a relative question but from what i gather you're still using it so i was just wondering for how long and what kind of driving you were doing with it?

I'm still not certain on the options to tighten/shorten the shifter on the 6MT. I've seen a few modified/aftermarket shifters on the Upgarage website, but there wasn't enough info in the ads for me to bother buying one.

I may have jumbled my words but generally speaking, the 6MT is going to fail due to an impulse/jerk. So, getting a clutch kit with harsh engagement, such as a hyper single, is going to significantly increase the odds of shearing teeth. This transmission can handle at least 300WHP, but if you're not smooth with your clutch engagements, completely letting off the throttle at 7500RPMS in second gear, clutch kicking like its 2012, then you're 6MT is going to fail. On full deceleration, the weakest gears are 1st-3rd, which usually fail at high RPMs. (The engine is trying to slow down while the momentum continues to drive the car forward. Bother gears become drivers, and you end up with two opposing forces that meet at the teeth in the transmission.) Clutch kicking with this much horsepower and very sticky tires will shear some teeth. Using the hand brake and powering the car through a drift should be fine. It's possible to drift, but generally its not ideal for +300WHP.

On my track car, I use the Autech (Nismo/Exedy) flywheel and a Fidanza 3:2 Clutch Kit. Been using this setup since 2009 and still have yet to replace the clutch. On my daily, I use the OEM Dual-Mass flywheel and an unsprung clutch kit (currently an OEM Nissan kit). The flywheel and clutch kit were used when I bought the swap, but I've added another 5000 miles to it and still feels great.

I use my track car for road racing. Currently, the engine is only doing 200WHP. I've fooled around with a friend's S13 with 6MT (270WHP and about 250TQ) and drifted around a few corners. Transmission felt fine. I believe he is also using the OEM Dual-Mass flywheel and an unsprung clutch kit (unsure of brand).

Big Zee

07-01-2011, 10:35 PM

I try not to let the blonde come through to often, but reading this thread I so far only have one question sir.

on the graphs with grey and black lines, which one is the nismo gears and which one is the factory gears?

thank you, and I apologize if I missed that part.

xpertsnowcarver

07-02-2011, 03:54 AM

Light Grey is OEM Transmission gearing. Bold Black is the aftermarket comparison.

HPKMotorsports3

07-02-2011, 04:25 AM

How much to these trannys go for?

xpertsnowcarver

07-02-2011, 04:34 AM

A bit hard to answer. Here in the state, they usually sell for $400-450 for the transmission alone. Maybe $1000 if the flywheel, clutch kit, crossmember, and driveshaft (new, steel) are included. But, I'm no one to say what they should cost. I'm just posting what I've seen them go for.

In Japan, the 6MTs still sell for about $650, but shipping is an arm/leg.

Boostedkouki

09-12-2011, 10:18 PM

So im assuming people who run the 6MT never do upgrades there SR? I want to know how much power they can handle?

bowlspray

12-04-2011, 06:57 PM

This is an excellent write up. I have a couple 6 speeds and I joined the forum to add one thing. In my S14 (not sure about S13 chassis) I can install the transmission separately from the engine. I need to disconnect all the intercooler plumbing and hoses and move the wire running along the top of the firewall. Doing those things allows the engine to tilt back enough to remove the tranny. It is a squeeze though.

sidewaysil80

12-30-2011, 03:36 PM

found this while searching for the 6spd crossmember ala-carte:

http://www.nismo.co.jp/en/products/competition/mission/pdf/silvia_spec.pdf

it contains all the part numbers for essentially anything 6spd related on the 180sx/silvia.

ALSO, be advised the throwout bearing is NOT the same between 5spd and 6spd. i don't recall off the top of my head but one is of smaller diameter compared to the other.

ST(I)mpreza

01-09-2012, 04:50 AM

what an excellent and thorough write up, thanx man. Zilvia needs more of these!

quadzilla

01-25-2012, 06:50 PM

3v1Ls14

01-26-2012, 04:46 PM

has anybody put speedo drives in these? I have the nismo cross reinforced box which had provisions on the main shaft for a speedo drive, ie had the two grooves and hole for a steel ball with the rear housing having a removable bung over the vss hole.

i did a little tinkering myself..

i put a drive gear on the main shaft using an rb25 auto speedo drive gear. it is 2mm smaller in internal diameter. but very carefully i was able to bore it out enough just before the gear became too thin. it was also to wide to fit in the space provided. so i ground it down on a bench grinder and tidied it all up.

i will be using a c34 vss and i am hoping that it will do the trick. if not i will have to find myself a s14 vss.

have heard of people running s15 abs computer etc etc but too much of a hassle for me and i already took my abs out anyhow

logedog

03-03-2012, 10:28 AM

i have the s15 engine and trans and i am planning to make in the neighborhood of 550 to 600 hp max is there anything i can do to strengthen the tranny without spending $10500

3v1Ls14

03-27-2012, 09:09 PM

The 6 speed gearbox uses same yoke as an RB auto box if anybody didnt realise this

winter

03-27-2012, 09:57 PM

Great thread. I had one in my non turbo S15 SR car and I never had to replace it. I beat the hell out of my S13 drifting as slow as I could, and the tranny never gave me shit. Considering about doing the 6spd MT in my S13 SR setup , but I have an FC..so it's complicated like a Facebook relationship status.

Silvia352

03-28-2012, 04:21 PM

Great info here guys. Im just curious why do you have to use the s15 flywheel when fitting the 6 speed to a non s15 sr20det?

I can understand the flywheel is thicker. Is the input shat on the 6 speed not long enough to work with the s14 flywheel?

Shot in the dark, but I want to say it is bc both the flywheel and bell housings overall diameter are larger and the matching flywheel is needed for trans, flywheel and starter to align.

3v1Ls14

03-28-2012, 11:16 PM

6 speed uses dual mass flywheel, needs it as stated above different diameter bellhousings etc

garageafterlyfe

04-05-2012, 12:18 PM

3v1Ls14

04-06-2012, 01:24 AM

hello from chicago, i have a kinda silly question so please dont kill me,lol can the drive shaft from the 5mt s14 fit the 6mt from a s15? i have a s14 blktop with a 5mt and blew 5th gear and when i put it in reverse the trans wont go back to nuetral when i want to get out from reverse unless i drive it in rev, for about 10ft or so then it pops out on its own? so i just got a 6mt and now the driveshaft doesnt fit?so what should i do? im kinda lost here,anyone in chicago have a yoke i can buy for 6mt? lol hit me back.thanks and this wright up is SSOOO informative! thank you so much. [email protected]

You can use an auto drive shaft. I dont know if it is the same as a SR auto. But in my 6 speed i actually used a factory auto drive shaft from an RB R32 skyline.

Basically the 6 speed yoke is just an auto yoke. everybody says u need a custom one blah blah blah. But no u dont. auto has same yoke.

garageafterlyfe

04-06-2012, 11:56 AM

hello again, hey 3v1ls14 thanks for the reply. but i still have a problem, i cant find any skyline parts locally and would have to order from somewhere online,so what other options do i have for a driveshaft yoke for the 6mt? can any other yoke fit from other us spec nissans? i've been hitting the junkyards for about 3 days now and no luck. :( i thought a ka yoke would fit but none available what would be best for my trans/yoke combo? or do i need to have a custom yoke and d-shaft made? im stuck!! lol any one else care to share as well please, thanks very much. oh btw, pics to come soon, i have a 1977 corolla wagon(te38) with s14 sr20det and ae86 gts diff. so hopefully can take her out soon, thanks again forum.

3v1Ls14

04-07-2012, 09:44 PM

what would be best for my trans/yoke combo? Or do i need to have a custom yoke and d-shaft made? .

everybody says u need a custom one blah blah blah. But no u dont. Auto has same yoke

you can use an auto drive shaft

any nissan rwd silvia skyline etc auto drive shaft yoke fits the 6 speed!

marcs13r32

04-08-2012, 07:44 AM

will a 5 speed from a KA fit on a s15 motor?????!?!?!?!?!

racinjayson

04-27-2012, 02:21 PM

richmond82

05-16-2012, 10:49 AM

Great info thank you

xpertsnowcarver

05-17-2012, 06:46 PM

This maybe a silly question, but do you think that there is a possibility of removing the bell housing to machine off the extra thickness and run an s14 flywheel? Or since that might misalign the starter, take the bell housing and section an inch out of it at the base which would pull the tranny closer without messing with the starter aliment. I think I'm going to try this and get back to this thread to report my findings because a 17lbs flywheel is just unacceptable when with the s14 setup you can have a 9.5lbs flywheel.

I would not recommend this. The transmission casing is made of cast aluminum, and you may weaken the integrity of the casting, which may lead to cracking.

slideways240

06-06-2012, 04:12 PM

This maybe a silly question, but do you think that there is a possibility of removing the bell housing to machine off the extra thickness and run an s14 flywheel? Or since that might misalign the starter, take the bell housing and section an inch out of it at the base which would pull the tranny closer without messing with the starter aliment. I think I'm going to try this and get back to this thread to report my findings because a 17lbs flywheel is just unacceptable when with the s14 setup you can have a 9.5lbs flywheel.

An easier solution would be to use something like the Exedy hyper single. The included flywheel is not dual mass and extremely light comparatively. Also I can second the other S14 owner. Removal of the tranny alone is doable in an S14 chassis, it's a pain though.

3v1Ls14

06-07-2012, 02:37 AM

its taking a box out of a car while still in place. it is what it is. not usually very fun to do and you will more than likely have a little less space than you'd like, but you can do it if you feel like getting it done.

Silvia352

06-07-2012, 02:06 PM

No, the distance needed to clear a dual mass flywheel is much larger, you can find aftermarket 6MT flywheels that are the proper distance.

The distance you would have to cut the housing down would surpass the alignment holes, not to mention its extremely unsafe idea in general.

richmond82

01-10-2013, 09:49 AM

thank you for this thread !

s14fbs

01-19-2013, 02:46 PM

so i figured this would be the best place to ask

i got a 6 speed swap and is came with this was told its a nismo flywheel its very light

thinking its the Autech Flywheel

anybody can confirm this and maybe have more info on it as of it value
i searched for a little and could not find much on it
http://i157.photobucket.com/albums/t72/easternbikes1990/153BED85-F88F-496E-BD2D-68D199B1EB17-3961-000002045F3221B0.jpg

stockasfuhs14

02-03-2013, 12:21 PM

where could i possibly get a rebuild kit for a 6 speed?

oni jake

02-03-2013, 02:21 PM

Did you blow up gears or are you looking for synchros? If you blew up gears, the cheapest option is to find a replacement trans or go 5-speed. I'm unsure where you would get a rebuild kit for synchros, I've always assumed they are only sold in Japan and would probably cost too much anyways.

stockasfuhs14

02-03-2013, 02:28 PM

oni jake

02-03-2013, 03:12 PM

Your post did not answer my question in any way.. Not looking for gears, looking for a rebuild kit(seals, syncros etc)
Sorry man, wasn't trying to help you or anything. I've looked for the same thing a while ago, and with little information on the 6-speed I couldn't find where to go. Previous post was kinda hinting that you're on a lost cause. If rebuild kits are only sold in Japan, (which I think they are) then you have to find a seller, convert yen, pay shipping, rebuild at a shop. In all, it'll cost less than a 5-speed swap. Makes no sense to do all of this work on a "weak" transmission, but that's a whole other case.

GL on finding info, post it here if you do.

stockasfuhs14

02-03-2013, 03:25 PM

Sorry man, wasn't trying to help you or anything. I've looked for the same thing a while ago, and with little information on the 6-speed I couldn't find where to go. Previous post was kinda hinting that you're on a lost cause. If rebuild kits are only sold in Japan, (which I think they are) then you have to find a seller, convert yen, pay shipping, rebuild at a shop. In all, it'll cost less than a 5-speed swap. Makes no sense to do all of this work on a "weak" transmission, but that's a whole other case.

GL on finding info, post it here if you do.

Did you read this thread?

ThatS13Guy

02-03-2013, 03:34 PM

great info!! wish there were more threads like this

oni jake

02-03-2013, 05:08 PM

Did you read this thread?

Did you? Its a been a while since I've looked for this stuff.

I've looked for the same thing a while ago, and with little information on the 6-speed I couldn't find where to go.

stockasfuhs14

02-03-2013, 07:57 PM

oni jake

02-03-2013, 08:47 PM

This is not a thread for ppl to request info and other ppl to say "just get a 5sp" ... This is the 6 SPEED INFO THREAD. Meaning if someone asks a question and you don't have the answer, "just get a 5 speed" is not the right response. And for your info, I have a six speed already.. Sorry you didn't.

Don't be a chode, sit back and relax, no one is knocking you. You misunderstood my intention to gain reason out of you. Do what you want, you are gonna be terribly butt hurt when you find the price differences to rebuild a 6 speed compared to a 5 speed. When you find a place, share your info. I had a friend in Japan check years ago and it was laughable when you convert yen and add shipping. I honestly have no idea where you can find rebuild kits for 6-speeds in the states. Try calling Touge Factory?

s14fbs

03-28-2013, 07:07 PM

for anyone wanting a complete 6 speed swap

http://zilvia.net/f/sale-items/510317-100-sr-6speed-greddy-nismo-dss-s15.html

tooquick240

04-22-2013, 02:15 PM

-I previously had an s15 engine/tranny with nistune/cams/injectors and dyno'd 303whp and 304wtq.
-16lbs boost stock turbo.
-tuned by Martin from Zfever in Tampa, FL.
-The 6 speed handled the torque no problems.
-Never drifted but did go to drag strip 3-4 times with about 3 passes each time.
-Minor issue of getting into reverse, but resolved issue with solid tranny mount.
-car was stolen Oct last year
-Loved the trans so much decided to mate it to my l26 in '74 datsun Z

-If you want to see my build thread on the old fairlady type
"s30 with s15 6 speed" into google

-Should be finished with build in mid May this year.

-Dont bash this Trans unless you bash gears!

racinjayson

06-13-2013, 09:22 AM

I said I was going to do this last year and I have. I've successfully shortened and mated a six speed trans. to light 17lb clutchmaster fx700 clutch for all other sr's and I've found out some interesting things while doing it. The people who think that the six speed is weak have no idea what their taking about. I had both 5 and 6 speed tranny's apart and sitting side by side. The truth is that the gears are the same size. The only reason people think the tranny is weak is because of the behemoth of a 40lb dual mass flywheel in front of it. It's simple physics, take a 40lb rotational mass spinning at say 5000 rpms and then try to slow it down with one transmission gear, say 2nd and what do you get, no 2nd gear. The reason the 5 speeds hold up to the abuse better is quite simply due to the light weight flywheel's available to it. I solved this problem and I'm going to make more if anyone is interested. I'll be selling them on eBay in the coming months so stay tuned. Mind you it's no easy task and requires a lot of calculations to make it right, but when it's finished you can mate the 6 speed tranny to any sr20 clutch available. I will upload some pics once I get back home to my computer.

oni jake

06-18-2013, 04:12 AM

i said i was going to do this last year and i have. I've successfully shortened and mated a six speed trans. To light 17lb clutchmaster fx700 clutch for all other sr's and i've found out some interesting things while doing it. the people who think that the six speed is weak have no idea what their taking about. i had both 5 and 6 speed tranny's apart and sitting side by side. the truth is that the gears are the same size. The only reason people think the tranny is weak is because of the behemoth of a 40lb dual mass flywheel in front of it. it's simple physics, take a 40lb rotational mass spinning at say 5000 rpms and then try to slow it down with one transmission gear, say 2nd and what do you get, no 2nd gear. the reason the 5 speeds hold up to the abuse better is quite simply due to the light weight flywheel's available to it. i solved this problem and i'm going to make more if anyone is interested. I'll be selling them on ebay in the coming months so stay tuned. mind you it's no easy task and requires a lot of calculations to make it right, but when it's finished you can mate the 6 speed tranny to any sr20 clutch available. I will upload some pics once i get back home to my computer.

no.

No.

You're wrong.

So you created a flywheel shim?

And no.

LoSt180

06-18-2013, 10:43 AM

Thank you for the info in this thread, it's actually funny how similar this trans is with my G35 (350Z) 6mt. Dual mass flywheel, etc.

Waaaay back in 2001-2002 timeframe, when I was working on my first SR swap, somebody somewhere busted his 6-speed and the "weak" rumors seem to have been parroted by forums ever since. Plus S15 swaps were $7-8k back then so "too expensive" also came into play.

Recently got another 240, glad to see things have progressed since 2005.

b4l

06-18-2013, 10:47 AM

dam great job on the post

racinjayson

06-19-2013, 12:18 PM

no.

No.

You're wrong.

So you created a flywheel shim?

And no.

No shim idiot, obviously you no nothing about this trans. You can't shim a flywheel out and still have your starter engage the ring gear. I physically shortened the bell housing and relocated the pilot bearing into the end of the crankshaft. I have had these transmission completely apart and sitting side by side and I'm telling you the gears are the same size. The 6 speed is 5% narrower and that's it. It's the inertia of the flywheel that snaps gears. Instead of the load being transferred back into the motor and bogging it down, it simply keeps spinning and strips off gears in the trans. It's simple physics. You haven't done it and you don't know, so stay off this thread, negative Nancy.

oni jake

06-19-2013, 08:52 PM

^^^LOL this faggot

racinjayson

06-24-2013, 07:27 PM

Here are some pics I took of the transformation.

56674New pilot bearing in the end of the crank shaft, relocated from the flywheel. The input shaft is not long enough to locate the pilot bushing in the standard location inside the crankshaft. Pilot bearing is something we found at the local bearing shop.

56675 Mocking up the transmission without the bell housing to figure out the amount that needs to be removed.

56676 No going back from here. Cutting the bell housing before getting it machined to a perfect face once again. Notice the jig I built to hold the bell housing straight. If I start doing a lot of these, then I will be using a band saw for the initial cut.

56677 Final step, installing the trans onto the motor.
It all really worked out very well and I'm so happy to be rid of that stupid huge dual mass flywheel!

s14fbs

07-08-2013, 06:53 PM

or you can just run a nismo lightweight flywheel for the 6mt lol

racinjayson

07-10-2013, 10:01 AM

Kingtal0n

07-10-2013, 12:15 PM

You people just don't get it. Yes, the NISMO flywheel is the lightest flywheel you can get for this transmission, but it still weighs in at almost 14lbs and cost by itself almost a 1000 bucks. You can get a fidanza 9.5lbs flywheel and clutch assembly for under 500 bucks all day long on eBay which puts you under or right at 20lbs total. You'll never be able to beat that in the standard transmission form. My total clutch assembly weighs just 17lbs which if I do the math correctly is a mere 3lbs heavier than your NISMO flywheel. Beat that, oh you can't.

Ive been quite happy driving around with the OEM flywheel/clutch combo. A little weight and slip to keep the trans alive forever.
Let these guys keep telling themselves the six speed is weak; it brings prices down and we can stock up on them while they last :rofl:

s14fbs

07-10-2013, 06:09 PM

You people just don't get it. Yes, the NISMO flywheel is the lightest flywheel you can get for this transmission, but it still weighs in at almost 14lbs and cost by itself almost a 1000 bucks. You can get a fidanza 9.5lbs flywheel and clutch assembly for under 500 bucks all day long on eBay which puts you under or right at 20lbs total. You'll never be able to beat that in the standard transmission form. My total clutch assembly weighs just 17lbs which if I do the math correctly is a mere 3lbs heavier than your NISMO flywheel. Beat that, oh you can't.

i understand what your saying its just alot of work

and i can beat that i got my full 100% complete 6 speed swap with nismo flywheel for 400$ if you think about it thats 100$ less then u paid for your clutch setup:hide:

dont gotta get so hostile

we all love 6mt here

racinjayson

07-11-2013, 12:26 AM

Not really all that much work. Now that I've done, I could do it in just a couple of hours less the time on the mill which is only about a half hour if you cut it correctly. Turns out, they've been doing this over in Aussie land for awhile now. Guess I'm not as cool as I thought.

jr_ss

07-11-2013, 12:53 AM

Yes, the NISMO flywheel is the lightest flywheel you can get for this transmission, but it still weighs in at almost 14lbs and cost by itself almost a 1000 bucks. You can get a fidanza 9.5lbs flywheel and clutch assembly for under 500 bucks all day long on eBay which puts you under or right at 20lbs total. You'll never be able to beat that in the standard transmission form. My total clutch assembly weighs just 17lbs which if I do the math correctly is a mere 3lbs heavier than your NISMO flywheel. Beat that, oh you can't.

Sometimes you want the rotating mass to help with drivability, especially in a daily driver car. I for one like not having to rev and slip the piss out of the clutch to get moving because there is no mass help move the car.

Lighter is not always better, unless you're using this is a completely racing only application.

My twin disk setup from Exedy on the 5MT is 35lbs total weight. The clutch setup I had prior was 34lbs. I'm sure clutch/flywheel weight combos play a role in the destruction of tranmissions, but if a transmission is rated for X torque, no matter how light the rotating assembly gets infront of it, you're not going to make it any "stronger".

Sweet project though. I always wanted the 6MT, but it was always more work than I wanted to do to have a true 6spd and working speedo.

Agamemnon

07-11-2013, 10:51 AM

I would like to add some info to this thread.

NISMO sells a speedo gear mounting kit to move the VSS from the differential to the transmission tail section. It places the VSS in the same spot as it would be in a S13 or S14. The kit comes with everything needed except the speed ring gear.
NISMO Silvia Reinforced Cross 6-Speed Transmission - Speedometer Gear Mounting Kit (http://www.rhdjapan.com/nismo-silvia-reinforced-cross-6-speed-transmission-speedometer-gear-mounting-kit-64507)

No more s15 diffs and signal converters!

Enjoy.

dwnshft2drft

07-17-2013, 03:47 PM

It is something like this...57891

My Questions are:
I already have the housing extension on the 6MT, so now where can I get a speedo drive gear from? From KA 5MT? Or SR 5MT? Looks like its not included in the Nismo kit.

The ball bearing and snap ring is it the same parts from the KA 5MT/SR 5 MT?

Would the s14 speed sensor works accurately with the s15 cluster speedometer?

racinjayson

07-17-2013, 08:18 PM

dwnshft2drft

07-18-2013, 09:41 AM

You can use the nylon gear out of what tranny your using the vss out of, but you'll have to get a big unibit to drill it out to fit over the larger output shaft of the s15 tranny. I did this and it worked great. Oh you'll have to find a small ballbearing to lock the gear on too. The s13 ball bearing is too big.

Awesome thanks! Should I just buy the snap ring anywhere as long as i have the shaft diameter for it and i think i might need two right?

racinjayson

07-19-2013, 01:59 PM

Yep, two snap rings, although I only used the front because the fit was so tight and the gear was too wide to get the back one in. So, if you want to use both, you'll have to narrow the nylon gear a bit, but as tight as it was after boring it out, there's no way it was going anywhere. I had to use a crescent wrench and hammer to tap it into place. Hope this helps. Cheers.

S13GG

07-26-2013, 09:00 AM

The 6 speed gearbox uses same yoke as an RB auto box if anybody didnt realise this

and the S-chassis auto yoke...

haven't measured the case lengths 6MT vs AT though

racinjayson

07-26-2013, 09:10 AM

Yes, you have to knock off the oil slinger on the auto yoke (two little welds on either side, a cutoff wheel, and a small hammer takes care of it), but other that that the driveline fit perfect. Not sure about the length of the auto trans, but I know the six speed is shorter than the ka 5 speed. I'm not positive about the numbers but I think it's around 30"s 6spd, 33"s 5spd in length.

dwnshft2drft

07-26-2013, 01:35 PM

S15 SR with 6MT and diff. bolts on to s14, but how about the S15 stock drive shaft?

racinjayson

07-26-2013, 05:21 PM

Don't know anything about the stock s15 drive line, didn't get one with my swap motor, but I would assume it is the exact same as the s13 auto drive line length and all save the oil slinger.

S13GG

07-27-2013, 05:15 PM

anyone able to help with some part #'s? (6speed) I think I have them but unverified...

shifter control housing 32515-89F00
throw out bearing 30502-69F10
throw out bearing carrier

sources;

328 - transmission shift control (unit) for Silvia S15 Nissan Silvia - Genuine parts (http://nissan.epc-data.com/silvia/s15/4127-sr20det/trans/328/32145/)

REPAIR PARTS | Products | EXEDY RACING CLUTCH (http://www.exedy-racing.com/racing/en/pro/repair.html)

S13GG

07-27-2013, 06:20 PM

Nissan Release Bearing and Sleeve Set' (http://www.rhdjapan.com/nissan-release-bearing-and-sleeve-set-14460)

http://www.tomeipowered-usa.com/usa/msrp/nismo_msrp_2011oct.xls

S13GG

08-10-2013, 08:11 AM

does the transmission plate (between block/bell housing) remain the same 5 vs 6 speed?

will I require S15 part or will my S13 part work the same....

I've searched, with no luck leading me to believe its unecessary...

racinjayson

08-10-2013, 01:04 PM

Agent S14

08-10-2013, 01:19 PM

My only question is I am doing a s15 swap with the 6 spd trans what are my diff options apart from the s15 diff since I need the abs module for my Dakota.

racinjayson

08-12-2013, 10:02 PM

My only question is I am doing a s15 swap with the 6 spd trans what are my diff options apart from the s15 diff since I need the abs module for my Dakota.

There are quite a bit of things in this thread that discuss this very topic, so read through it and if you still have questions I'll do my best.

Agent S14

08-12-2013, 10:09 PM

There are quite a bit of things in this thread that discuss this very topic, so read through it and if you still have questions I'll do my best.

I have now my question is the Dakota sgi-5 do the trick? There is no specific model in the walkthrough.

Nilsson

08-28-2013, 04:11 AM

Hey guys, really dont know if this is the right thread to ask this question.
But anyway, anyone knows the difference if you take the s15 spec-r 6-speed diff and put it in a s14 kouki sr20det with 5-speed?
Need a welded diff and a buddy of mine got the original from his s15!

Thanks /Nilsson

racinjayson

08-28-2013, 06:58 AM

Nilsson

08-28-2013, 04:16 PM

Man, I wouldn't weld up an s15 diff, but it will work just fine. The only difference is the gearing. Your diff. now is probably a 4.08 or 3.90 where as the original s15 gearing is a 3.69 so your tach. at 65 will be about 300 rpms lower. Like I said ,though, I wouldn't weld it up, because it's already a helical style posi. which by many standards is the best type of posi. you can get. Yes, of course, not for you drifters, but time attack, autocross, and track days there's nothing better.

Damn, I hoped it would be the other way.. Need to get me a 6-speed tranny, always thought my gears are sooooo long if u know what i mean, ~85 topspeed at 2nd gear and ~115 in 3rd.
Got a good price at the s15 diff so might as well use it! :) thanks for the good answer!

/Nilsson

Croustibat

08-29-2013, 03:41 AM

only the s15 spec R diff is a torsen unit, the S15 spec S (and tbc the auto) is a standard diff.

Sell the S15 spec R diff with the halfshafts, it is worth a bit of money. Dont get a 6spd from an S15, unless you want to change it often. The late Z33 6 spd is really great even for drifting, as it is quite short and precise. I know a pro drifter using one around here. Full kit (including new gearbox from nissan, adapter plate, machining, propshaft, and maybe labor ) is around 4000€.

Another way to make a gearbox "shorter" is the Clarkson way: "POWERRRRRRRRRRRRRR" :mrgreen:

Nilsson

08-29-2013, 04:38 PM

Agent S14

09-15-2013, 10:42 AM

My swap didn't come with the shifter does anyone know where I can get a s15 shifter.

S13GG

11-11-2013, 11:09 AM

Speedo gear question:

So I had my s14 speedo drive gear (metal) machined for a 28mm vs 25mm shaft

There are 2 clip groves, but the nismo kit only includes 1, so I only ordered 1

The gear is too wide to expose both groves,

My guess is; put the c-clip in forward groove and the rear housing holds it in place?

Anyone with experience care to chime in?

Agent S14

11-12-2013, 08:11 AM

i am still working on my speedo issue also

kuruptR

11-13-2013, 12:26 PM

Would anyone happen to know:
I have an S14 SR with a Exedy Hyper Single (clutch and fly wheel combo), Would this combo work with the S15 Transmission?
Also, can you swap the bell housing between S15 and S14 to allow the use of a S14 Clutch?

Can anyone post pics on how to install the VSS ring into the S15.

dawagarage

11-13-2013, 05:51 PM

hello all :)
pardon me, i dont mean to add clutter to the thread,
i only ask because maybe others could benefit from it.

how does the 6 speed s15 trans compare to the 6 speed z33
trans?

-which one is more plentiful/tangible?
-does it cost more to source the s15 trans OR the z33 and adapter plate
(and/or whatever else it takes to run it)?
-how are the gearings compared to each other?
-which one is stronger (id assume its the z33, but i dont want to assume...)

again, only trying to help and bring more options and info to the community.

kuruptR

11-14-2013, 02:53 AM

I just backed out of a S15, because the Z33 seems like a better route. Z33 gear boxes are reasonably priced on ebay. I feel the s15 swap costs a bit much for what it is.

pg240

11-14-2013, 12:45 PM

just got the s15 engine and tranny swap done with a Toda 11lb flywheel and ACT 6 puck street clutch. i drive it almost every day and im so glad i got this setup. just have to sort out the speedometer issue

S13GG

11-15-2013, 05:26 AM

Alright, ^I will document and upload the speedo correction in about a week or so when I get around to finishing it up, with part numbers etc...

pancakes562

01-07-2014, 01:24 AM

Wow, this is a really good write up. I don't plan to do a swap any time soon but when I do I will be coming back to this. Thanks!

Bernie (NoVA)

01-16-2014, 04:45 PM

My swap didn't come with the shifter does anyone know where I can get a s15 shifter.

Do you still need the shifter lever?
I have an extra for S15.

soundboy

02-23-2014, 05:05 AM

Any problems mating a s15 DET with a s13/14 5 speed box?

shaggy0778

03-05-2014, 11:44 AM

I have an S14 with a relatively stock S15 motor making 304whp 306wtq and the transmission is still holding strong.
However, I am starting to have some issues with the clutch slipping. I have purchased a new clutch and flywheel, but was wondering; do I have to remove the engine to change the clutch? It says in the OP there's no way to get the transmission in and out with the engine in the car. If this is true that makes clutch changes a real PITA

jr_ss

03-05-2014, 12:03 PM

Wrong place to ask said question. Try the actual tech section next time, not the stickier threads.

However, it's not impossible to get the trans out with the motor still in, it just takes some finesse.

slow_sr20

07-23-2015, 06:49 PM

Does anyone know, can I use an automatic s14 KA driveshaft for the s15 6 speed trans? I found a super old thread from freshalloy where someone said you could. Just looking for clarification before I pay out for a "JDM" s15 6-speed shaft. Thanks.

dorkidori_s13

07-23-2015, 11:03 PM

buy the S15 shaft. the american drive shafts were pieces of shit. the JDM drive shafts didnt use the stupid hockey puck damper on the tranny output shaft that goes to hell in a hand basket (turns into a frayed mess). the JDM drive shafts used standard yolks and a rebuilding center bearing bushing.

or just buy a single piece aluminum drive shaft and enjoy the wonderful 100% direct feeling in acceleration!

soundboy

07-24-2015, 04:50 AM

The aluminum shafts make the most sense imo

dorkidori_s13

07-24-2015, 09:12 AM

The aluminum shafts make the most sense imo

single piece drive shafts arent for everyone though. there is a bit of noise that comes with them since there is no rubber to dampen out drivetrain noise. also, unless you are really familiar with your gear ratios, gearbox rumble from trying to accelerate a too low of rpms can really shake the hell out of the car with a single piece compared to an OE 2 piece.

slow_sr20

07-24-2015, 12:47 PM

I had an aluminum in my last car. The noise it made was ungodly. I'm looking for oem like qualities. I was hoping for an inexpensive option for now. So does that mean the U.S. Spec auto shaft will work, or no?

shaggy0778

07-27-2015, 09:14 PM

ShakotanGazelle

08-06-2015, 08:02 PM

dwnshft2drft

08-06-2015, 08:56 PM

sooooooooo, anybody have the part number for the speedo drive gear and the associated c clips and bearing to get the speedo to work in an S13?

ive got 2 full s15 setups so i sold all my 5 speed stuff haha and at least one of them has the VSS plug

Speedometer gear mounting kit:
Extension housing 32130-RRS50
Ball 32720-RRS50
Snap ring 32228-RRS50

6 speed with VSS plug are from early s15 the late type dont have them.

ShakotanGazelle

08-06-2015, 09:15 PM

Speedometer gear mounting kit:
Extension housing 32130-RRS50
Ball 32720-RRS50
Snap ring 32228-RRS50

6 speed with VSS plug are from early s15 the late type dont have them.
Thank you! But what about the actual plastic gear that sits on the shaft inside the tail housing? Am I doomed to track down a blown 5 speed and modify it to work? Or is there a direct replacement for the s15 gearbox?

dwnshft2drft

08-06-2015, 09:52 PM

Thank you! But what about the actual plastic gear that sits on the shaft inside the tail housing? Am I doomed to track down a blown 5 speed and modify it to work? Or is there a direct replacement for the s15 gearbox?

They did not mention that gear part number. You need to modified other gears for test fit.
And for the extension housing you already have it.

itsjustdaphne

09-04-2015, 08:33 PM

Not my car, but a friend of mine in Jacksonville is making over 400whp on an s15 6 speed. He broke the original trans after 3-4 months of dailying/abuse including launching with 275 radials. He's now on his second

Mustang dyno:
https://scontent-mia1-1.xx.fbcdn.net/hphotos-xfp1/v/t34.0-12/11756685_10207431173481065_928000355_n.jpg?oh=66b4 100530b2d1e3d8f53740f28afc0f&oe=55B92ACC

And this one is done too..... :(
Time to go 350z trans, finally.
There's a video on my IG of how noisy it is.
The last trans did the same thing until it just didn't want to go into gear at all and I'd get stuck in neutral while driving.

Kingtal0n

09-04-2015, 10:12 PM

If you drive it nice, it can last a long time at 400bhp. No hard launches, no slicks, no drifting, no terrible clutch kicks.

The only reason I am not using a six speed right now is because of their cir-clip issue.

itsjustdaphne

09-27-2015, 01:23 AM

Riding in a tow truck at 3am. Just toasted the 3rd trans. Awesome.

S13GG

10-23-2015, 09:03 PM

Thank you! But what about the actual plastic gear that sits on the shaft inside the tail housing? Am I doomed to track down a blown 5 speed and modify it to work? Or is there a direct replacement for the s15 gearbox?

Did you figure this out?

I used the USDM "speedo drive gear" to suit my chassis, ie: speed sensor (5MT - KA - 95) and had it enlarged to fit (I.D.) 28mm.

This part is inside the transmission on the output Shaft, so get the parts guy that has experience with the exploded diagrams, and not the 18yr old.

ShakotanGazelle

10-24-2015, 08:47 AM

Did you figure this out?

I used the USDM "speedo drive gear" to suit my chassis, ie: speed sensor (5MT - KA - 95) and had it enlarged to fit (I.D.) 28mm.

This part is inside the transmission on the output Shaft, so get the parts guy that has experience with the exploded diagrams, and not the 18yr old.

I got a blown 5 speed for free so that's here I'm gonna steal that part from.

Anyone got the 6mt bell housing bolt sizes or a set I can buy? Bought a 5mt set but half the bolts are way too short - go figure

mik5082

11-08-2015, 12:10 AM

circlip modification by neat gearboxes

https://neatgearboxes.wordpress.com/2014/04/16/nissan-silvia-s15-6-speed-gearbox-circlip-mod/

ShakotanGazelle

11-15-2015, 09:15 PM

so what do s13 6 speed guys use for driveshafts? the s15 one i have is too long and the carrier bearing is like 6" too far back.

slow_sr20

02-20-2016, 10:36 PM

If anyone is planning to ditch the dual mass flywheel, keep in mind that you will most likely need standard s13/s14 flywheel bolts. The s15 bolts are way too long. ARP seemed to be the cheapest. That's what I used with a Nismo/Autech flywheel.

slow_sr20

02-29-2016, 07:07 PM

Is there anyone out there with confirmed drive shaft fitment info? my car is s14/abs car. I purchased what i was told is a 6-speed s15 drive shaft. Fits into output of transmission just fine but is too long. The rear section from diff to carrier is off by 1/2" approx. The front section is entirely too long by probably 2-3". Anyone else compile any data? I figure i can locate a stock rear section and have the front section shortened, but was hoping for a bolt in solution.

Goldhawg

05-25-2016, 08:42 PM

I have an Autech S15/6 speed that I'm swapping in a Datsun roadster. It has 60K miles on it. I'm thinking that I should at least replace the clutch disc before I install in the car. thoughts? What clutch disc should I get to replace the one I have?

rcefoonia

08-15-2016, 09:54 PM

Amazing write up we don't even have this much info in AUS about the gearbox.http://onlinemarketingou.com/apple/images/18.gifhttp://onlinemarketingou.com/apple/images/2.gif
http://onlinemarketingou.com/apple/images/1.gif

rcefoonia

08-15-2016, 10:01 PM

dam great job on the post http://goo.gl/lYjLEy http://goo.gl/KLN6OT http://goo.gl/dK3BAI

Kingtal0n

09-24-2016, 07:25 PM

LoSt180

09-26-2016, 09:13 AM

I was re-reading this for some info about the gear ratios and using a calculator came up with a different gear spread, here is the modified version

http://i9.photobucket.com/albums/a90/kingtal0n/REALCOMPARISON_zpsfddktmmx.jpg (http://s9.photobucket.com/user/kingtal0n/media/REALCOMPARISON_zpsfddktmmx.jpg.html)

You should probably keep the final drive the same for a gear set comparison. I'm curious what an S14 5-speed looks like compared to an S15 6-speed, both with 3.692 FD.

3.916 was only on A/T cars, 3.692 was M/T, and 4.08 was NA and all USDM models.

chulme1234

09-29-2016, 11:01 AM

Quick question if somebody dosent mind answering....

Bought a S15 6MT to put on my SR20DE drift car

It came with the shifter, but no knob so I bought an eBay special, I've tested all the gears and its fine...

But how do I engage reverse?! I've tried pushing down and pulling up but no luck? Do I need a special gearknob to pull up?

Bit confused haha

Sorry if this sounds stupid!

Also sorry again for bumping an old thread

Sent from my E5823 using Tapatalk

dorkidori_s13

09-29-2016, 11:19 AM

its a 90s 6 speed... so probably just push all the way to left and up, or all the way to the right and up or down. no need to push down or pull up on the gear shift.

chulme1234

09-29-2016, 11:21 AM

Looking at pics on one of the first few pages and it's all the way across right and down, next to 6th, sure I tried that though

Sent from my E5823 using Tapatalk

dwnshft2drft

09-29-2016, 11:22 AM

Do you have it installed already?

chulme1234

09-29-2016, 11:23 AM

Do you have it installed already?
Yes mate

Sent from my E5823 using Tapatalk

dwnshft2drft

09-29-2016, 11:26 AM

Theres a reset trick. Have some one push the car reverse while you engage clutch then force it to reverse. I had the engine running and be safe though.

chulme1234

09-29-2016, 11:27 AM

Theres a reset trick. Have some one push the car reverse while you engage clutch then force it to reverse. I had the engine running and be safe though.
What I'm asking is do you have to push the knob down or anything to put it in reverse?

I know how reverse works

Sent from my E5823 using Tapatalk

dwnshft2drft

09-29-2016, 11:31 AM

Looking at pics on one of the first few pages and it's all the way across right and down, next to 6th, sure I tried that though

Sent from my E5823 using Tapatalk

This is correct no downs or ups. If you still cant put it in reverse. Try the Japanese trick I posted.

chulme1234

09-29-2016, 11:42 AM

This is correct no downs or ups. If you still cant put it in reverse. Try the Japanese trick I posted.
How does that work? Do you keep pushing to the right and try put it in reverse?

Sent from my E5823 using Tapatalk

dwnshft2drft

09-29-2016, 11:51 AM

How does that work? Do you keep pushing to the right and try put it in reverse?

Sent from my E5823 using Tapatalk

Yes mate, while someones pushing the car reverse. Try it and let me know if this works. If it does I'll tell you what went wrong.

TheRealSy90

09-29-2016, 11:52 AM

All the way right and down how hard is that to understand.

chulme1234

09-29-2016, 12:24 PM

All the way right and down how hard is that to understand.
Because I didn't know that?

No need for the attitude.
Yes mate, while someones pushing the car reverse. Try it and let me know if this works. If it does I'll tell you what went wrong.
Wicked cheers for the helpful comments buddy!

Sent from my E5823 using Tapatalk

dwnshft2drft

09-29-2016, 12:40 PM

All the way right and down how hard is that to understand.

He's doing it right but he was just confused ;)

dwnshft2drft

09-29-2016, 12:53 PM

Because I didn't know that?

No need for the attitude.

Wicked cheers for the helpful comments buddy!

Sent from my E5823 using Tapatalk

No sweat mate! Hey wonder if you can help me out to find me a s15 evaporator box and s14a front bumper side cover/caps? (pictured)

http://uploads.tapatalk-cdn.com/20160929/db4d4c09c55733a2277c69c6c4b681bd.png

TheRealSy90

09-29-2016, 07:14 PM

Okay when it's said two or three times and you keep asking...

Sent from my iPhone using Tapatalk

LoneWolfK16

02-06-2017, 07:26 PM

So I'm still having a slight misunderstanding when it comes to the dual mass setup. Someone please shed light upon my situation :facepalm:

If I purchased this clutch

http://www.frsport.com/ACT-NS1-XTR6-6-Puck-Unsprung-Xtreme-Clutch-Kit-89-98-SR20DET_p_15134.html
or
http://www.frsport.com/ACT-NS1-HDR6-6-Puck-Heavy-Duty-Clutch-Kit-89-98-SR20DET_p_1422.html

would I then have to purchase a new flywheel or will this be a direct bolt onto the dual mass?

I'm trying to prepare to replace my clutch in my car before it goes. (S15 Spec R with a 6MT). I just want to buy the right things once instead of back and forth'n it. I've been reading on this but I still cant grasp the concept of the correct setup on whether clutches are specifically designed for dual mass vs single mass.

"Clutch Disc and Pressure Plate. Any clutch kit for the 5MT will work, but if one is using the OEM S15 Dual-Mass Flywheel, then feel free to get an unsprung clutch kit, even though this may be costly. Sourcing a new OEM replacement clutch kit is rather difficult to find. You can use a sprung clutch kit on the Dual-Mass flywheel, but the dampening will be overkill and shifting between gears may feel sloppy. "

I've contacted FRSport and they were also unsure whether this would work. (Even though is says its 5 or 6spd compatible in their notes.)

Help would be much appreciated. :kiss:

TheRealSy90

02-07-2017, 08:18 AM

Like they say, get an unsprung clutch disc since you're using the dual mass flywheel. That's all.

Sent from my iPhone using Tapatalk

LoneWolfK16

02-08-2017, 08:22 PM

Like they say, get an unsprung clutch disc since you're using the dual mass flywheel. That's all.

Sent from my iPhone using Tapatalk

This doesn't answer my question what so ever.

LoSt180

02-09-2017, 08:58 AM

This doesn't answer my question what so ever.

It does, sorta. Either of those clutch kits will work with the dual mass flywheel. The diameter of the disc and the mount points of the pressure plate are all the same. There are no physical differences between the 14 and 15 clutch apart from the 14 ones have springs in the friction plate to absorb harsh loads. S15's don't 'need' this as the dual mass fly does the same job but fitting a S14 clutch to a S15 will not be detrimental at all.

Personally (just an opinion of a guy on the internet), I'd get rid of the dual mass flywheel and find a good lightweight flywheel. It will need to be S15 specific due to the flywheel being physically thicker than the S13/S14 one. If converting to a single mass lightweight flywheel, then you'd probably want to consider a sprung clutch (ie a normal SR clutch kit available).

TheRealSy90

02-09-2017, 04:23 PM

Yep, just get an aftermarket flywheel with the specific offset for the s15 transmission, and then you can use any s13/s14 aftermarket clutch.

LoneWolfK16

02-09-2017, 05:17 PM

Yep, just get an aftermarket flywheel with the specific offset for the s15 transmission, and then you can use any s13/s14 aftermarket clutch.

Ehh, rather keep the dual mass on. Its really nice when daily driving.
Thanks for the input fellas.

Hope the ACT clutch works. Cheers :2f2f:

TheRealSy90

03-24-2017, 12:44 AM

You'll want an unsprung disc on a dual mass flywheel.

Sent from my iPhone using Tapatalk

ShakotanGazelle

03-24-2017, 10:49 AM

dwnshft2drft

03-24-2017, 01:14 PM

I had the nismo coppermix sports clutch kit which is a lightweight single mass steel flywheel, and a full face unsprung clutch disc and it felt amazing, relatively easy pedal feel but still incredibly sporty feeling. Best way to describe it would be like a Porsche gt3 or similar kind of sports car.

I have the same kind but after installing the nismo coppermix kit, then created issue engine stalling and shuts off before stopping traffic lights. So kept doing heel toe all the time. Some say its the flywheel too light? Did you adjust TPS or change throttle body? Any help would appreciate it.

LoneWolfK16

04-21-2017, 07:10 PM

It does, sorta. Either of those clutch kits will work with the dual mass flywheel. The diameter of the disc and the mount points of the pressure plate are all the same. There are no physical differences between the 14 and 15 clutch apart from the 14 ones have springs in the friction plate to absorb harsh loads. S15's don't 'need' this as the dual mass fly does the same job but fitting a S14 clutch to a S15 will not be detrimental at all.

Personally (just an opinion of a guy on the internet), I'd get rid of the dual mass flywheel and find a good lightweight flywheel. It will need to be S15 specific due to the flywheel being physically thicker than the S13/S14 one. If converting to a single mass lightweight flywheel, then you'd probably want to consider a sprung clutch (ie a normal SR clutch kit available).

Now this answered it perfectly. Thanks mane.

Eoken

05-07-2017, 02:38 AM

Time to do a little 6 speed work! I am doing a S15 six speed swap on my blacktop S13. I will be making a custom drive shaft and be running a S15 HLSD with a 3.69 ring gear to get the S15 stock gear ratio. Here is what I had found out installing my SR20DET 5 speed VSS drive gear onto the outputshaft of the S15 6 speed. Hope his info helps people!

https://s4.postimg.org/iiuez36z1/IMAG2260.jpg

https://s4.postimg.org/kxap42ry5/IMAG2262.jpg

https://s16.postimg.org/58tnotcqt/IMAG2263.jpg

S13 VSS Drive gear was bored out by hand from 25.0mm inside diameter to 27.9mm using a round file (I have seen some people say 28.0mm but I kept checking it with my caliper and got 27.9mm...). The steel ball that keeps the drive gear rotating interdependently from the shaft sticks out 5.1mm when installed in its hole. I used a small green rotary tool bit to make the half circle in the drive gear deeper to fit the ball. I then used two a 1-1/18 inch external snap rings to secure the drive gear from moving up or down. to do this I had to take off a mil or two off the top and bottom inside portion of the gear and notching out a place for the ends. It fits well and the S13 VSS installs smoothly and seems to spin nicely when I spun the output shaft when it was all back together. I know people have talked about doing this but I might e the first S13 guy to try it lol! If you are interested in any more details/ methods/ tools just let me know and I can help.

https://s21.postimg.org/alkk5qe3b/IMAG2264.jpg

LoSt180

05-07-2017, 09:02 AM

Wow, beautiful work and great detail. My question is will your speedo be off since you're using the S15 3.69 FD, and the S13 was 4.08. I forget about the interchangability of sensors, but S14 SR had the 3.69 FD also.

Eoken

05-07-2017, 10:41 AM

Yes, I will need to use a speedo correction kit like a yellow box or similar product. But it should be very straightforward since the signal will not have to be converted.

Eoken

05-07-2017, 11:15 AM

does anyone know where I can find the torque specs for the rear transmission housing (using 12mm bolts for the 6 speed? it is mentioned in the original post make sure to torque them to spec but the spec is not mentioned.

I have looked in the SR20DET S14 factory service manual and it is not even mentioned for the 5 speed in there >. >

FSM:http://www.240edge.com/manuals/s14_sr20det.pdf

the transmission section starts on page 369

LoSt180

05-07-2017, 11:36 AM

Eoken

05-08-2017, 12:07 AM

top work loSt180, you lead me right to my answer! 22-28ftlb

https://s27.postimg.org/v5aqdk537/S15_six_speed_tourqe_specs.png

LoneWolfK16

05-13-2017, 05:36 PM

TheRealSy90

05-14-2017, 04:50 AM

Those are VERY good clutches. Honestly one of the best available. I'd seriously look into refurbishing that clutch lol.

Sent from my iPhone using Tapatalk

LoneWolfK16

05-14-2017, 05:36 AM

Those are VERY good clutches. Honestly one of the best available. I'd seriously look into refurbishing that clutch lol.

Sent from my iPhone using Tapatalk

Yeah I thought about just replacing the disc, but both the fly wheel and pressure plate have severe heat spots all over. The clutch disc was inspected and gauged and still had plenty of life on it. But yet its starting to slip. Its been in the car for about 4-5 years now. Probably gonna just but a new one from.

TheRealSy90

05-14-2017, 05:50 AM

Should be able to get the flywheel resurfaced and maybe a replacement pressure plate ring? Rhd Japan has lots of clutch refurbish stuff but never looked for that one specifically.

Sent from my iPhone using Tapatalk

Busted_daily

06-19-2017, 09:34 AM

Hey so after reading if I went with the 6puck white bunny package which is competition clutch and aftermarket flywheel it should work fine with s15 6speed trans

TheRealSy90

06-20-2017, 11:38 PM

S15 trans needs an s15 specific flywheel.

Sent from my iPhone using Tapatalk

joaquin714

06-28-2017, 11:39 PM

Can I use a s15 clutch flywheel combo on a s13 sr? I know physically it will bolt up but curious if the throw out has diff.

TheRealSy90

06-30-2017, 03:47 PM

Can I use a s15 clutch flywheel combo on a s13 sr? I know physically it will bolt up but curious if the throw out has diff.

You can if you also use the s15 6sp transmission.

Sent from my iPhone using Tapatalk

s13vette

07-10-2017, 12:27 PM

Links to buying 6speed flywheels?

LoSt180

07-10-2017, 01:42 PM

Links to buying 6speed flywheels?

www.google.com

Fastimport

10-17-2017, 10:39 PM

Does anyone know what these weigh?
Considering bringing one in from Japan to do surgery on the bell housing so it will bolt on to my L-series truck engine.

Would be nice to know ahead of time what shipping will cost.

Fastimport

10-23-2017, 07:44 AM

Well, I just bought one of them, so I will find the weight once I have the shipping bill, no problem.

Now I need to find one that has blown, as I would like a spare bell hosing to modify to fit an L-series engine.
Someone must have a one that they blew...

Fastimport

10-24-2017, 07:57 AM

Links to buying 6speed flywheels?

I have bought these flywheels out of Japan for 15 years, sold hundreds of them, and never an issue.

https://page.auctions.yahoo.co.jp/jp/auction/q172944733

And at the very top is a link to 'Buyee', which is Yahoo's forwarding service.

The only reason I no longer sell flywheels is because of the stinking chinco crap being sold for shit low prices.
You know, the shiny black ones that everyone who deals in chinco shit to make a fast buck at the end user's expense.

slow_sr20

10-27-2017, 06:30 PM

I’ve got a stock dual mass flywheel if anyone is looking. I lucked into a autech for my build.

TheRealSy90

10-28-2017, 10:37 PM

Wish I could find a damn s15 autech sr20de engine.

Sent from my iPhone using Tapatalk

lowered_impressions

10-30-2017, 09:27 PM

Hey! What’s the exact fluid capacity on the 6mt? And can you pour it in from the shifter like the 5mt?

TheRealSy90

10-30-2017, 11:14 PM

Should be the same capacity as the 5sp and yes.

jr_ss

10-31-2017, 09:03 AM

Hey! What’s the exact fluid capacity on the 6mt? And can you pour it in from the shifter like the 5mt?

Pull the side "fill" plug and add fluid until it starts to drip/pour from that hole.

Should be the same capacity as the 5sp and yes.

I would imagine it's probably slightly less considering there is more gearing/shafts/bearings in the same space.

dwnshft2drft

10-31-2017, 04:28 PM

Hey! What’s the exact fluid capacity on the 6mt? And can you pour it in from the shifter like the 5mt?

6MT oil capacity is 1.8 liters (3-7/8 US PINT)

Fastimport

11-02-2017, 01:44 PM

[QUOTE=Fastimport;6235312]Does anyone know what these weigh?/QUOTE]

OK, this thing weighs 92.6 lbs without throw-out assembly, for inquiring minds.

The one I picked up off Yahoo-JP turned out to be an HPI close ratio. :rawk:
And since it is good for 430HP, it's going into my Cressida.:naughty:
I'll pick up another for my old Datsun L4.

Goldhawg

11-16-2017, 04:54 AM

Anybody have a part number for the slip yoke? I didn't get one with my tranny and need one and I was told it would be the same as the automatic 240SX but can't find a part number online.

Fastimport

12-03-2017, 01:34 PM

Although the speed sensor port wasn't bored into the tail shaft housing, when I pulled it apart, there was a nice surprise :)
A genuine 6-speed drive gear was already on the shaft !

http://i192.photobucket.com/albums/z237/duaxmachine/DSC08751.jpg

Now, if I can just find the part number...

The housing was bored, and because this is going into a cable drive application, I picked up the driven assembly from the old Z-car 71B trans.

http://i192.photobucket.com/albums/z237/duaxmachine/DSC08738.jpg

http://i192.photobucket.com/albums/z237/duaxmachine/Datsun/DSC07709_2.jpg

TheRealSy90

12-03-2017, 02:56 PM

Woah, first 6sp I’ve ever seen with a speedo gear from factory.

Sent from my iPhone using Tapatalk

Fastimport

12-03-2017, 05:09 PM

Another local Nissan guy thinks that it's aftermarket, and is digging for the info.
I'll let you know.

99lspwr

12-07-2017, 09:15 PM

anyone know the part number to just the cross member? I have an s14 with this 6 speed and only 2 of the cross member bolts are currently being used...

LoSt180

12-08-2017, 05:30 AM

anyone know the part number to just the cross member? I have an s14 with this 6 speed and only 2 of the cross member bolts are currently being used...Looks like you can buy an installation kit that includes that cross member. Start there maybe? https://conceptzperformance.com/nismo-3137s-rrs50-reinforced-cross-6-speed-transmission-mounting-kit-nissan-240sx-180sx-s13wo-abs-s14-s15-sr20de-sr20det_p_24222.php

99lspwr

12-08-2017, 05:47 AM

Looks like you can buy an installation kit that includes that cross member. Start there maybe? https://conceptzperformance.com/nismo-3137s-rrs50-reinforced-cross-6-speed-transmission-mounting-kit-nissan-240sx-180sx-s13wo-abs-s14-s15-sr20de-sr20det_p_24222.php

thats the one i was coming across as well... Just did not need all that stuff in the kit since my car is allready together and running.. Thanks for the reply

Fastimport

12-12-2017, 08:22 AM

I have 4 of the speedo gears coming from Japan (all that I could find).
And will be offering them as a kit, that will include boring the tail shaft housing, the gear, ball, and 2 snap rings.

Stay tuned :)

dwnshft2drft

12-12-2017, 08:26 AM

TheRealSy90

12-12-2017, 08:54 AM

So what's the deal on the speedo gears? They're oem? And there's only 4 left in the world or they just don't have many in stock.

dwnshft2drft

12-12-2017, 09:33 AM

So what's the deal on the speedo gears? They're oem? And there's only 4 left in the world or they just don't have many in stock.

All I care is he’s doing us a favor. I don’t have time to sit and search.

jdm_land

09-27-2018, 08:26 AM

Does anyone know if the S15 auto driveshaft will work with the 6 speed in a s13 with a skyline diff? Thank you

slow_sr20

01-07-2019, 07:08 PM

Anyone running short shifters on their 6 speed? I’m looking for input. I never ran short shifter on my 5 speed SR but the six speed throw seems very long?

I’ve only ever seen one C’s That I slept on...
There’s an Australian company (Cube) on EBay that has a nice looking one, and anther on EBay that appears to be a copy of cube Australia.

I’m not super aggressive and I understand short shifters can be hard on synchros, still would like to see what others are doing.

Bernie (NoVA)

01-07-2019, 07:26 PM

Anyone running short shifters on their.....

I have a genuine c's for 6 speed available. PM me

TheRealSy90

01-07-2019, 10:59 PM

At this point it just seems so much easier to run an abs ring and dakota converter for the speedo.

zenkizenki

09-09-2019, 06:22 PM

My 6 Speed is about to blow, can i use the 6 speed bell housing on a ka24de tranny? Keep the dual mass flywheel or go with smaller 5 speed one.
Thanks

600hps14

09-11-2019, 07:31 AM

epic thread - nice to see good info like this out there :eek3:

My!

09-18-2019, 05:57 PM

hello everyone, i'm trying to rebuild my transmission and am hunting for these parts if anyone could point me in the right direction:
2nd gear 28tooth
4th gear 34tooth
1/2 synchronizer sleeve
3/4 synchronizer sleeve
5/6 synchronizer sleeve
Reverse synchronizer sleeve
Reverse gear 35tooth
Input shaft 28tooth,24 spline, 9-1/8” long
Bearing kit
Seal kit
Synchronizer ring kit

waiting on nengun and megazip to email me back but was hoping someone else could help me stateside.

dwnshft2drft

09-18-2019, 10:22 PM

Need the part number.

2nd gear 28tooth
4th gear 34tooth
1/2 synchronizer sleeve
3/4 synchronizer sleeve
5/6 synchronizer sleeve
Reverse synchronizer sleeve
Reverse gear 35tooth
Input shaft 28tooth,24 spline, 9-1/8” long
Bearing kit
Seal kit
Synchronizer ring kit

My!

09-19-2019, 10:02 AM

Need the part number.
yes i do, ive found diagrams online through nengun but i'm not confident enough to determine which is which without a description.

here's the two diagrams i've been looking at: https://www.nengun.com/oem/group/MzgzMzIgLSBNZkNmbW9CWU1mQ2ZtN0JOZGtObWJXOUNXVTFtUT JadGIwWkRURlJOZVUxcE1IZE5SRWsgLSBUcmFuc21pc3Npb24g R2VhciA8dW5pdD4=

dwnshft2drft

09-19-2019, 11:52 PM

A quick search for now. If you can copy that nengun diagram and highlight which ones you need. That way I can give you exact part numbers and price.

Discon - 2nd gear 28tooth
$85.81 - 4th gear 34tooth
$38.27 - 1/2 synchronizer sleeve
Discon - 3/4 synchronizer sleeve
Discon - 5/reverse synchronizer sleeve
$33.91 - 6 synchronizer sleeve
$90.35 - Reverse gear 35tooth

??? - Input shaft 28tooth,24 spline, 9-1/8” long

Sold individual - Bearing kit

Sold individual - Seal kit

Sold individual - Synchronizer ring kit

My!

09-20-2019, 08:24 AM

S14rebuild

09-25-2019, 05:26 PM

My 6 Speed is about to blow, can i use the 6 speed bell housing on a ka24de tranny? Keep the dual mass flywheel or go with smaller 5 speed one.
Thanks

Nooo does not work

mrrisk

09-25-2019, 10:21 PM

Great write up! This is premium quality stuff.

racinjayson

10-28-2019, 02:34 PM

Ok, so I had my reverse shifting fork break on my 6spd and I was having a hard time trying to find parts for this transmission. Turns out the 99 to 05 Mazda Miata 6spd trans is made by the same company(Aisin AZ6), so I took a chance and purchased one that was a core for parts only. Here is the low down, the input shaft for the two are different and the main shaft as well as the bell housing and tail-shaft housing. The gears are different ratio's but the same as in they'll work in the nissan trans. All the syncro's, shift forks, bearings, secondary main shaft and complete center section including the case itself are exactly the same. So if you looking for parts to rebuild your nissan trans in the U.S., you can get most everything you need out of the mazda and you can get parts online from Jim Ellis Mazda with a complete parts diagram breakdown. Hope this is of some help to anyone in need of some rebuild parts, thanks.

TheRealSy90

10-28-2019, 05:04 PM

Turns out the 99 to 05 Mazda Miata 6spd trans is made by the same company(Aisin AZ6)

The Aisin AZ6 is in a ton of vehicles:

Altezza AS200 & RS200
Lexus IS300
Toyota "86"
Scion FRS
Subaru BRZ
Mazda MX-5
Mazda RX-8
Nissan S15

Has anyone tried the "circlip fix" on their s15 trans? There's a company in Australia that does the fix or can send the parts pre-done. Apparently it's the main weak point that causes the strength issues on these trans and once the revised part is installed they hold up to a lot more power/torque.

racinjayson

10-28-2019, 05:21 PM

The Aisin AZ6 is in a ton of vehicles:

Altezza AS200 & RS200
Lexus IS300
Toyota "86"
Scion FRS
Subaru BRZ
Mazda MX-5
Mazda RX-8
Nissan S15

Way to go Wikipedia man, none of those are the same as the Silvia except the miata trans. I searched them all and they have the same designator (AZ6) they are not even close to the silvia.

TheRealSy90

10-28-2019, 06:44 PM

Way to go Wikipedia man, none of those are the same as the Silvia except the miata trans. I searched them all and they have the same designator (AZ6) they are not even close to the silvia.

How are they not the same exactly? You yourself noted the differences between the Miata and Silvia trans. So those aren’t “the same” either.
I know for a fact the Altezza/IS300 trans is just as similar as the Miata trans is. With the same differences as well. Again, same for all those other vehicles. Aside from bellhousings, gear ratios, and the odd sensor here or there, other internals are effectively the same.

Sent from my iPhone using Tapatalk

racinjayson

10-28-2019, 08:26 PM

You're missing the point the altezza is a Japanese car, I'm giving information about a U.S. based model that you can get parts for in the U.S. not Japan.

TheRealSy90

10-29-2019, 05:32 PM

Ok 5 of those 6 are american lol.

racinjayson

10-29-2019, 06:33 PM

And those five are not the same or are not readily available or cost a fortune, dude don't you think I already went down this road before I posted, give me a break.

afishysilvia

10-29-2019, 07:11 PM

And those five are not the same or are not readily available or cost a fortune, dude don't you think I already went down this road before I posted, give me a break.

So at this point what do you need then? I’m running a J160 in my Altezza Beams and have a spare sitting in my garage. I’m not looking to sell but do you need photos of something?

racinjayson

10-29-2019, 11:58 PM

Jason Shaha, and I don't need anything, I used a Mazda miata six speed transmission and got the shift fork and a few synchro's, back together and running.

afishysilvia

10-30-2019, 12:18 AM

Jason Shaha, and I don't need anything, I used a Mazda miata six speed transmission and got the shift fork and a few synchro's, back together and running.

No need for introductions, I am just clarifying what’s needed here before this thread turns to shit. Glad you resolved your problem and thanks for the input.

[240sx]

10-30-2019, 08:15 AM

Jason Shaha,..
No need for introductions...
https://uploads.tapatalk-cdn.com/20191030/fced0ca9769328dda86a41a819a7af26.jpg

Non-pussy confirmed.:l101:

Sent from my SM-G970U using Tapatalk

slow_sr20

10-31-2019, 08:26 PM

Does anyone running a Dakota Digital SGI 5 know roughly what their configured settings are? I’m setting it up to use the abs sensor on the s14 diff through SGI5 to 95 s14 SE cluster.

dwnshft2drft

10-31-2019, 09:18 PM

Does anyone running a Dakota Digital SGI 5 know roughly what their configured settings are? I’m setting it up to use the abs sensor on the s14 diff through SGI5 to 95 s14 SE cluster.

Lowest setting 2.50 and still off by 10% to 20% at actual speed 65 mph - speedometer reads 80mph. I think I’m doing it wrong?

97 kouki cluster
S15 abs diff sensor

afishysilvia

10-31-2019, 10:01 PM

;6361849']https://uploads.tapatalk-cdn.com/20191030/fced0ca9769328dda86a41a819a7af26.jpg

Non-pussy confirmed.:l101:

Sent from my SM-G970U using Tapatalk

This is gold lol.

TheRealSy90

11-01-2019, 12:28 AM

And those five are not the same or are not readily available or cost a fortune, dude don't you think I already went down this road before I posted, give me a break.

Anyways, this is what I was talking about. Neat Gearboxes in AU offers the fixed gear shaft that fixes the main weak point in the az6 trans. Oh what do you know it works in ALL of those chassis I posted [emoji849]

https://uploads.tapatalk-cdn.com/20191101/f7291f910225d0fac44a327ce00c58cc.jpg

Sent from my iPhone using Tapatalk

dwnshft2drft

11-01-2019, 09:12 AM

Anyways, this is what I was talking about. Neat Gearboxes in AU offers the fixed gear shaft that fixes the main weak point in the az6 trans. Oh what do you know it works in ALL of those chassis I posted [emoji849]

https://uploads.tapatalk-cdn.com/20191101/f7291f910225d0fac44a327ce00c58cc.jpg

Sent from my iPhone using Tapatalk

CRIKEY mate!

LoSt180

05-27-2020, 12:04 PM

Has anyone successfully used the S15 ABS controller to get a functioning speedo in an S14? Which wire in the cluster do you connect the ABS speedo output to? The S14 VSS is 2 wires (R/Y & R), but the S15 output is only 1 wire.

RalliartRsX

05-27-2020, 01:31 PM

Just saw a S15 6 speed with S15 diff, clutch and shift mechanism for 2200!??!!?

I am pretty sure the glss S15 gearbox is worth as much as my #2 pencil.......with no lead

Kingtal0n

05-27-2020, 03:29 PM

Just saw a S15 6 speed with S15 diff, clutch and shift mechanism for 2200!??!!?

I am pretty sure the glss S15 gearbox is worth as much as my #2 pencil.......with no lead

I Know someone local, tuned the car, 440rwhp through that original six speed for almost 20 years now. So I don't count them all out of the game.

RalliartRsX

05-27-2020, 04:52 PM

TheRealSy90

05-27-2020, 06:53 PM

Just saw a S15 6 speed with S15 diff, clutch and shift mechanism for 2200!??!!?

I am pretty sure the glss S15 gearbox is worth as much as my #2 pencil.......with no lead

Yeah that?s my post. I priced it according to what I see s15 spec r transmissions for sale for on eBay, as well as the complete differential which I only found one other for sale.

Again, Neat gearboxes has posted info on what the main fault with the transmission is and what usually makes them fail. Plus tons of people have ran these transmissions without failure. Everyone assumes they just shipped every s15 out the factory with a broken transmission [emoji849].

For a street car that someone wants a nice 6 speed trans setup where everything bolts with in without any adapter stuff, it?s perfect.

Also my asking price was 2200 or best offer.

Every trans on eBay is 1400 and 900 for the one diff that?s on there..

https://uploads.tapatalk-cdn.com/20200528/35475333a116237ef23e6de3e29ba78e.jpg

Sent from my iPhone using Tapatalk

TheRealSy90

05-27-2020, 06:55 PM

Whp is not what breaks gearboxes. Its sticky tires/grip, digs and torque.....

The s15 gears are physically smaller to allow the gearstack to fit in the exact same space of the larger gearstack of the 5 speed.

Dont doubt ya king.. but a single notional data point doesnt properly categorize the actual physically smaller size of the gearstack or the well documented failures

Also intended use and vehicle weight has a major affect on how long they last.....that and which Japanese glass company made the gearstack that day hahahahah :)

I would hope that someone wouldn't be dumb enough to be drag racing on the transmission. For what it's worth people break s13/14 transmissions all the time with stock/bolt on sr20's. They're all "weak". This transmission isn't intended for a damn racecar.

Sent from my iPhone using Tapatalk

LoSt180

05-30-2020, 02:35 PM

Instead of parroting 18 year old flawed arguments about smaller gears, here's some useful info:

The rear output seal to the driveshaft is larger than the common S13/S14 seal. Vendors told me it was a JDM part that would have to come in from Japan.

Turns out the FRS/BRZ output seal is exactly the same size and readily available at your favorite parts stores/websites.

The shifter housing gasket is still a JDM only part, so waiting on that thing.

https://uploads.tapatalk-cdn.com/20200530/5b952bc8fef1a186491f9417b249e22c.jpg
https://uploads.tapatalk-cdn.com/20200530/f223746cc2f147a641d74e586d798d3f.jpg
https://uploads.tapatalk-cdn.com/20200530/eeba5893d778a56f6eaaf6e94c7ba90b.jpg

Also, the aluminum drain/fill washers can use Toyota part as well: 90430-A0003

https://uploads.tapatalk-cdn.com/20200613/c6d8e32207a419b2e458f6f2d149c73c.jpg

LoSt180

06-16-2020, 05:28 PM

No one really answered my speedo question. So, looking over the Nismo catalog I saw that they offered a VSS "kit" consisting of a snap ring and ball, but no info on the gear. Found some old threads and ordered an S14 gear. Needed to dremel out the middle a bit since the S15 output shaft is 3mm larger than the 5 speed. Crossing fingers this works when i finish everything up.

Parts:
32228-RRS50 - Snap Ring
32720-RRS50 - ball
32701-E9800 - gear

https://uploads.tapatalk-cdn.com/20200616/4cb5ec170f6fac792c567292b1ea9dc6.jpg
https://uploads.tapatalk-cdn.com/20200616/b6f48b7f371007b9c7458f9027f37e56.jpg
https://uploads.tapatalk-cdn.com/20200616/a488350c0d24ca9174d68385faaf9c49.jpg
https://uploads.tapatalk-cdn.com/20200616/d192c1b5d454318ffb2e29e52105734e.jpg

dwnshft2drft

06-16-2020, 05:37 PM

I did the same thing definitely highly recommend than inaccurate dakota digital.
https://uploads.tapatalk-cdn.com/20200616/78ce96337d2eb1cacbb65cfb9d76754e.jpg

LoSt180

06-16-2020, 05:39 PM

I did the same thing definitely highly recommend than inaccurate dakota digital.What final drive ratio are you using? Mainly wondering how far off my speedo will be if I change to 3.69 gears vs the stock 4.08.

dwnshft2drft

06-16-2020, 06:00 PM

What final drive ratio are you using? Mainly wondering how far off my speedo will be if I change to 3.69 gears vs the stock 4.08.

Right now its 4.08 diff, s14 cluster and, speedo. I?d say 2-3% faster maybe because I?m running larger diameter wheels sets.

Before I had the dakota wired with the abs diff sensor it was 20% faster. My oil change intervals went pretty quick lol

Let me know how that 3.69 works. I have the s15 diff waiting to install.

TheRealSy90

06-16-2020, 06:01 PM

That's weird that they don't sell a gear for the s15 trans VSS kit.

LoSt180

06-16-2020, 06:08 PM

That's weird that they don't sell a gear for the s15 trans VSS kit.Dude, tell me about it. Apparently they have gears available, but I have no idea how to get ahold of Nismo Japan to ask. The guys at Nismo USA don't know. My guess is they have different gears to match up with final drive ratios. Would be better if they just made a part number list and let us order that way. https://uploads.tapatalk-cdn.com/20200617/69085f5cf8cee5dfbc744e135c45888f.jpg

dwnshft2drft

06-16-2020, 06:10 PM

I would think omori Japan would know about it.

LoSt180

07-07-2020, 04:59 PM

Right now its 4.08 diff, s14 cluster and, speedo. I?d say 2-3% faster maybe because I?m running larger diameter wheels sets.

Before I had the dakota wired with the abs diff sensor it was 20% faster. My oil change intervals went pretty quick lol

Let me know how that 3.69 works. I have the s15 diff waiting to install.Got everything installed and it works! Added the 3.69 gear and speedo was reading 10% slow, showed 50 when I was really going 55 or 70 / 77 real speed, etc. Found an old thread about speedometer calibration, soldered some jumpers on the speedo itself and it's fully accurate. Even adjusted for my tire size. So using all stock parts, less things to possibly go wrong.

dwnshft2drft

07-14-2020, 07:39 PM

Got everything installed and it works! Added the 3.69 gear and speedo was reading 10% slow, showed 50 when I was really going 55 or 70 / 77 real speed, etc. Found an old thread about speedometer calibration, soldered some jumpers on the speedo itself and it's fully accurate. Even adjusted for my tire size. So using all stock parts, less things to possibly go wrong.

Do you still have that old thread? Thanks

LoSt180

07-15-2020, 03:55 AM

Do you still have that old thread? ThanksJust search for 240sx speedometer calibration and it'll come up. Main info is the % values for each pin. Look at what are set from factory, then figure out what combo works to get your desired change.

Here is one of the top results.
https://forums.nicoclub.com/s13-and-s14-speedometer-correction-options-write-up-t618567.html

So for example, pin 7 was only one soldered together. #7 = -12.4%
Difference going from 4.08 to 3.69 is +10%. So -12.4 + 10 = -2.4
Figure out what combo of pins gets you to -2.4 (so 0, 3, 4)
Desolder pin 7, and put a dab of solder on pins 0, 3, & 4.

In my case, I had extra math since I'm running 245/40R17 tires instead of the stock 205/55R16. Those are -0.8 smaller than stock. So to get mine correct: -12.4 - 0.8 + 10 = 3.2

There's 4 part numbers for S14 gauge clusters, so you need to base adjustments on whatever the starting point is on your cluster.