sr20det----higher rpms?

[20 til 3]

alright, i searched and couldnt find much, but who runs 8500+ on there sr20? and what is needed to do so, i was just looking into it because i wouldnt mind having some longer powerbands for drifting or w/e on tracks here and there


post up your setups and how well would this work w/ a s15 turbo? would the power drop after 7200?



also...my other mods are greddy fmic, 550cc injectors, megan man...dp...and greddy exhaust, z32 and apex safcII, pullies, koyo and e-fan

[TurbLu]

bump for more info...

[s13silvia123]

alright, i searched and couldnt find much, but who runs 8500+ on there sr20? and what is needed to do so, i was just looking into it because i wouldnt mind having some longer powerbands for drifting or w/e on tracks here and there


post up your setups and how well would this work w/ a s15 turbo? would the power drop after 7200?



also...my other mods are greddy fmic, 550cc injectors, megan man...dp...and greddy exhaust, z32 and apex safcII, pullies, koyo and e-fan



use the new HKS valvetrain upgrades its specially designed for drifting so you rev higher

[fliprayzin240sx]

Headwork and rom tune. If you dont have headwork, your liable to magically loose parts in your head. Namely valves and rocker arms...and whats this doing in chat, shouldnt this be in tech?

[Sileighty_85]

Go to Enjuku Racing and slap in some Tomei Solid Lifters

[smelly240]

the HLA's are good for 7800 if you run good valve springs with under 12.8mm lift. SLA's def rock the socks off em but they need to be checked for lash every 2800-400 miles and its not the best thing for the wallet. an s15 turbo isnt gonna do anything but turn ur tea into piss over 7200RPMs... and stock cams arent gonna help the fact. Chance are - 8500RPMs hitting a rev limiter will flip a rocker off or pop something near it. You'll need to take care of those things before u wanna rev over 7500 normally.

Mainly - the valvetrain is the weakness in these motors - they break Rockers, float valves and guess what - it not a s2000 ;)

u dont need to drive these cars like u hate them - my suggestion is to get valve springs and cams - and some rocker arm stoppers in case - and rev it to maybe 7800.

My biggest question tho - y do u want to rev that high with a s15 turbo? It's just gonna run outta steam. i can see if u had a GT35R and werent spooling it til late and u wanted more powerband, but u dont ;)

the other thing is - u have a stock ECU with that super gay timing. TUNE IT - afc=poop

i have teh HKS valvesprings sitting here - they're better than stock - but not extremely strong... perfect id say for 7800rpm on a step2 cam.

[McRussellPants]

use the new HKS valvetrain upgrades its specially designed for drifting so you rev higher

I chuckled at that.

Rocker Arm stoppers are a patch at best, get valvesprings, dual keepers for the rocker and SLAs.

Go to Fresh Alloy and wait for MattBack or someone to answer.

[smelly240]

LOL - MBV will try to sell you his new lifters (they rock btw - but u'll be adjusting em once a month)

so you know - the HKS valvetrain upgrades are mediocre at best and that statement is ridiculous...

MBV (MattBack Vass) is gonna tell you what i told you - springs and ur better, springs and SLA and ur golden. Dont use titanium ret on a street car - and dont have sex with farm animals.

I just realized - this guy might not know what all these letters mean (or other people) - HLA = stock - hydraulic lash adjusters AKA Lifters and SLA are solid lash adusters (solid mechanical lifters which u must manually set lash)

either way tho - stock cams with s15 turbo with a stock ECU = chokin the chikin

P.S. - Rockerarm stoppers really wont do shit in the event of bad things happenin. I'm not even sure why i still have them in my motor.

[Shadytrixta1]

I was waiting for a post about MBV solid lash killers and 9500 RPM SR's.

[SoSideways]

You guys also realized that MBV has problems shifting at that high of RPMs right? He has like, 15 trannies without teeth on 3rd gears, because the stock SR synchros don't like 9500rpm shifts.

So unless you ALSO have the Benjamins to pony up for an upgraded tranny, along with all the head work, then go right ahead for 9500rpm of goodness.

[Shadytrixta1]

Yeah heard he was saving for some bad ass tranny!I give him props though 254hp at 6lbs on an S14 sr

[smelly240]

i mean - its cool and all... but if its not making power at 9500 - who cares?

[SoSideways]

Well sometimes it is beneficial to have those extra revs to stay in the gear longer.

I mean, if you're coming up to a corner, and you're pegging your rev limiter at 7800rpm in 4th gear, but going up to 5th gear would just take a few tenths off your lap time, what do you do in that situation?

You would wish that you had at least up to 9000rpm just so you can stay in 4th gear and not pegging the rev limiter so that you can come to the corner and brake/downshift once or twice without having to worry about going into 5th and losing time and rhythm.

[wootwoot]

The only point in having a redline that high is for a frickin huge turbo or for great safety. If I sitll had an sr I would definitely do his stuff.

With the tranny issue I have the same problem with my TurboII. They do not like to shift if you ride it out all the way to 8200. I dont have a very large turbo on the car anyway so I shift at 7700ish. The reason his dogs are dead is because it diddnt want to shift but he decided it was going to anyway.

[SoSideways]

Ya I know. That's why I said unless you have a thing for broken 3rd gear teeth or unless you also have the money to shell out for a badass tranny along with all that headwork, it won't be worth it.

[wootwoot]

What are the differences between the 300zx and rb25 transmissions? The 300zx tranny is quite beastly as well, I wonder how it likes the high rpms. Good enough for a 9 second KAT I suppose but I have no idea how high they are taking it

[smelly240]

we all agree then - smackin a revlimiter at 9000rpm is stupid.

[SoSideways]

It's not stupid to have a 9000rpm limiter when you have done everything right to achieve that rev limit, ie. cams, valvesprings, turbo, headwork, tranny, etc.

If you just upped your rev limit to 9000rpm without any supporting mods, that IS stupid.

[thundering02]

This may seem like a dumb question, but if you need to readjust every very often why not use thread locker or something on the solid ones? (or am I missing something in the design as the last set of solid lifters I had was a Honda)

[wootwoot]

The adjusting nut does not necessarily slide down but there is vibration and wear. If your solution worked, trust me, it would have been done by now. Me personally, Iam going for a pnumatic valve train.

I think having a rev limiter that high makes complete sense for anyone drifting or road racing. Having the ability to go significantly higher then you will ever need to with a peak power at say 8 for the f of it is great. Safety man.

[TurbLu]

This is a very good idea. Reminds me of my honda days except for the fact that we have tourqe.

[smelly240]

having a 9000 rev limit isnt what i said was stupid ;)

smackin it - stupid.

[20 til 3]

nothing wrong with hitting rev limiter...thats why its there

and as for tranny stuff, if i'm gunna have problems unless i upgrade that, maybe i'll just wait for next year then

[smelly240]

hitting the effin revlimiter at 9000 is one of the things that breaks rockers..

hks springs and solid lash helps - but its not gonna be "safe" to whack

[yfz460]

Hey man, I don't care what you're talking about, nothing is safe to whack at 9000rpm's if you know what I mean....:keke:

I'm with wootwoot on this one, does anyone know what the 300ZX trannies have been up to and know what they are capable of doing? I was thinking of modding a bell housing off a 300ZX trans to fit my SR (adapters are costing CRAZY cash money!) so I wouldn't have to worry about transmission issues with some power going through it! After that who knows... if I could find out about this rpm ordeal, maybe I will see what I could pull off with my SR.

All I know is I pitty the fool shifting at 7,500!

[20 til 3]

hitting the effin revlimiter at 9000 is one of the things that breaks rockers..

hks springs and solid lash helps - but its not gonna be "safe" to whack


pshhh...who cares lmao...if i had a s2k..she would be bounsing at 9500 all the time lmao

[smelly240]

s2000 dont have rockers :D

<3 - rockerarms that dont break

[ManoNegra]

Hey man, I don't care what you're talking about, nothing is safe to whack at 9000rpm's if you know what I mean....:keke:

I'm with wootwoot on this one, does anyone know what the 300ZX trannies have been up to and know what they are capable of doing? I was thinking of modding a bell housing off a 300ZX trans to fit my SR (adapters are costing CRAZY cash money!) so I wouldn't have to worry about transmission issues with some power going through it! After that who knows... if I could find out about this rpm ordeal, maybe I will see what I could pull off with my SR.

All I know is I pitty the fool shifting at 7,500!

I think it's been done. Search FA.

[wootwoot]

having a 9000 rev limit isnt what i said was stupid ;)

smackin it - stupid.

That makes a lot more sense there son. To be able to hit that 9000 rev limiter with s15 turbo would be some frickin work. The car would feel like a dog after 8.

[SoSideways]

GT35R = 9000rpm goodness.

[yfz460]

ManoNegra, I know it could be done! Thanks for the advice as I may be needing it, every bit of info helps! :bigok:

[ejkisela]

Personally I don't see the need in going over 8000 rpm. If you want to stay in a gear longer put in a longer final drive. I actually want to install a 4.6 gear for my 180. I have a T04 Super H3. It spools @ 4500 and full boost is 5500. I drift this car two weekends a month. In some corners it drops off boost in second, but the corner is way to fast for first. Some entries are full third gear, so it's a fast to slow course. With the shorter final, you can always switch gears to hit the sweet spot and it will afford you better accelleration from the corner if road racing. the other benefit is that your gear set will see less stress and your transmission will not break as easily since it is "feeling" less stress.

The Z32, GTR32, GTR33, and R33 gears sets are all the same. The r33 and z32 missions are the same minus bellhousing.

[sideview_180sx]

y not PM MBV about his dyno results and his experiences with getting up to 9grand. rather then people going back and forth just talk to the damn guy who is doing it and has done it. and has kits to enable others to do so.


BTW I can't recall but MBV is using either an s14/s15 turbo.

[smelly240]

He(MBV) does it to test the things - he BEATS it at 8600 daily - and he still has NVCS!

remember tho, initial poster asks about the 8500+ rpms with a s15 turbo and asks if it would drop off. You all know it would drop off with a t28bb/gt28r. He kinda knew, even. 9000RPM is doable, hell Mark Mazurowski(SP?) can goto 10K rpm with that crazy monster (t88 greddy or gt4288r or some crazy mofo turbo he runs on that thing) but he not only builds that thing like its his job (it is) but hes also not smacking the revlimiter drifting it or crankin it up for 15minutes slammin through gears and hitting curbs around a track.

The motors have an upgrade path to run high revs, no doubt about that... but if you are running a s15 t28 you need to change that along with the headwork and rodbolts and valvetrain that you'll be upgrading to support the revs.

It sounds like the car is daily driven or at least more than a track car - so you can mod it to rev high with sla's and springs (and rod bolts to be safe) and have fun, but your car will still make its power low.

[ejkisela]

Spinning a motor to 9000 rpm is all good if that's what you want to do. But to spin it all the way to 9000 with no additional power benefit and just to say I can spin it to 9000 is not the best thing to do. A lot of wear occurs in high rpms.

I find that a broad power band works well, and the SR is very capable of producing one with the correct turbocharger. I commend people in the industry trying to push the sr to the limit, but for drifting, it is not necessary, especially with a T28 based (S14/5) turbo that lost it's steam at 6800 rpm. Before I would try to rev my SR to 9000 rpm, i would invest in a intake manifold that has shorter runners and that would flow at that high of an RPM. The SR manifold with the long runners is made for torque.

Spin it to 9000 by all means, once you have a set up that compliments spinning it that high...Just my 2 cents. If your drifting, then it's a little overkill. I would go for a broad powerband any day of the week. A very common set up here is a 4.3 and a S14/5 turbo or a HKS bolt on GT-ss or GT-RS/ Fortunetly in the states, you have the GT2871R with the 14 compressor availalble for 1 g cheaper.