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RedlineRacer
02-28-2003, 10:21 PM
I have always wondered aren't JDM silvia's 6 speeds? I thought they were and they are 6 speeds in Japan.
RedlineRacer
02-28-2003, 10:22 PM
Also, GT3 has them as 6 speeds.
S13FREEAAK
02-28-2003, 10:35 PM
From the factory only the S15 came with a 6-speed. The S13 and S14 were both 5-speeds.
Phlip
03-01-2003, 12:38 PM
And before you entertain thoughts of a swap, entertain thoughts of a new driveshaft and rear end... The driveshaft is a different length and the speed sensors are in the rear end on the S15, where they are in the tranny on the 5 speeds...
mrdirty
03-01-2003, 12:45 PM
Originally posted by PHLIP
And before you entertain thoughts of a swap, entertain thoughts of a new driveshaft and rear end... The driveshaft is a different length and the speed sensors are in the rear end on the S15, where they are in the tranny on the 5 speeds...

that's too bad; I had considered the 6....
Apparition
03-01-2003, 01:25 PM
Always nice to have your bubble popped. :D Those dreams of a 6speed, shot down! ;)
Phlip
03-01-2003, 01:33 PM
Originally posted by Apparition
Always nice to have your bubble popped. :D Those dreams of a 6speed, shot down! ;)
At age 23, I shouldn't really find kicking someone while they are down as funny as I do right now...
S15 Powered
03-01-2003, 02:22 PM
I've also heard that the S15 6 speed isn't a great tranny. Supposedly the gears are stronger on the 5 speeds. I hope that's not true and I'll let you guys know how my 6 speed works out when I finally get my car back.
sykikchimp
03-01-2003, 04:44 PM
only slightly weaker.. they say the 5-speed is good for 400-450hp.. the 6-speed is good for ~350. still pretty freakin stout.
Phlip
03-01-2003, 06:12 PM
Didn't blitz have an s15 that dyno'd like 450nat the wheels last year on the stock tranny?
RBS14
03-01-2003, 06:31 PM
The bellhousings are the same aren't they? Making the gears in the 6 spd thinner and weaker than the 5 spd. You would need to make every gear in the 6 spd thinner/smaller to fit them in the same area as 5 gears.
AKADriver
03-01-2003, 08:04 PM
Originally posted by RBS14
The bellhousings are the same aren't they? Making the gears in the 6 spd thinner and weaker than the 5 spd. You would need to make every gear in the 6 spd thinner/smaller to fit them in the same area as 5 gears.

Well, no, it's a totally new box, and it is longer, hence the need for a new driveshaft.

Personally I just don't see the point; every review I've read of the S15 said the gears were too close, that driving the 6 speed S15 at the limit just requires too much shifting.
drifterX87
03-02-2003, 01:19 PM
Well wouldnt the point of having a 6 speed in a car like that be so you can keep the engine reving higher? The closer the gears, the quicker you max them out, but at the same time you loose less RPM per shift dont you?

Mike
mrdirty
03-02-2003, 03:30 PM
Originally posted by drifterX87
Well wouldnt the point of having a 6 speed in a car like that be so you can keep the engine reving higher? The closer the gears, the quicker you max them out, but at the same time you loose less RPM per shift dont you?

Mike
yes and yes. It's a compromise between keeping in the power-band and limiting the number of required shifts.
AceInHole
03-02-2003, 08:31 PM
Originally posted by sykikchimp
only slightly weaker.. they say the 5-speed is good for 400-450hp.. the 6-speed is good for ~350. still pretty freakin stout.
Are those concrete numbers as in people have blown 6 speed trannies at ~350hp or is it just an assumption? I'm wondering if it's really true that the 6-speed is actually weaker. The thinner gear theory doesn't really make sense when you think about it (the gears don't HAVE to be thinner).
mrdirty
03-02-2003, 08:36 PM
Originally posted by AceInHole
Are those concrete numbers as in people have blown 6 speed trannies at ~350hp or is it just an assumption? I'm wondering if it's really true that the 6-speed is actually weaker. The thinner gear theory doesn't really make sense when you think about it (the gears don't HAVE to be thinner).

there's no such thing as a concrete number when it comes to material failure. A lot depends on how the power is applied, a tranny that can take 1000 smooth Hp may only take 200 while side-stepping the clutch.
sykikchimp
03-03-2003, 09:04 AM
no they are not concrete.. those are the Approximate number I've read browsing around the InArN3T. :) Of course I've also seen some guys say there is only negligable difference in strength, and the reason all the Japanese tuners swap to the 5-speed is because the gear ratios are better for they power they put down..


The close gears are proabably wonderful for a STOCK s15, but as soon as your putting 350hp to the wheels, all that changes, as the next gear change would come up mighty fast, and often mid corner where you don't want it. Running outta REVs sucks..
christopher
03-03-2003, 09:33 AM
http://www.hksusa.com/info/?id=1606

1603-RN012 (part #)
MANUAL TRANSMISSION 6-SPD
RPS13--------------------------------------------- $9,800.00

1603-RN017 (part #)
MANUAL TRANSMISSION 6-SPD
S14------------------------------------------------ $9,440.00


I think I will pass on this one fellas:eek: