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R34 Gtr Garrett -5 Turbo Lag, Need Advise

baicai

By baicai,
in Engines & Forced Induction

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mr skidz
mr skidz

what are people doing?chopping guys with -9's lol

GTRPSI
GTRPSI

Ok so your saying your S2000 started from 6K and red lined at 9K so you had a 3K window and you drove to those points when you wanted to go quick. (like all S2000's) So whats your points on the GTR,

Mick_o
Mick_o

Or maybe they made the wrong choice in turbos? A tune isn't gunna do "miraculous things" to make turbos come on! Everything around it is responsible. As said before its having a good intake, a good

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infamous_t Veteran

infamous_t

Posted
Posted

The most important aspects that the greddy intake kit addresses are the cold side merge before the FMIC, and the tendancy of stock intake (black rubber) to partially collapse and restrict intake.

The intake path is also much smoother for airflow.

Strangely the fixing the merge reduces turbo shuffle but on AFM setups the smoother intake of the hardipe kit has been know to increase it!

If you have a 33 or 34 I would personally recommend keeping the stock airbox, and either modding the stock twin turbo pipe or lashing out on the nismo item.

Intake to airbox can be firmed up be KTS hardpipe kit or one of the reinforced silicon pipes floating around.

For me on my 32, I scored the greddy kit cheap second hand and because I was changing to MAP I could ditch the poxy foam filters for some (larger) quality K&N items.

For the average punter I don't think there's any noticable power/response changes, but intake noise is much more noticeable as is OEM recirc/bov... this is a pro/con depending on your preference.

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  • 3 months later...
baicai Community Regular

baicai

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Update:

Installed Tomei dumps this week ( Bought HPI dumps but couldn't fit on my R34 Gt-R, 15mm too short, would only fit R32/R33 apparently) and "hi flowed" the twin cats of my Nismo exhaust.

Result:

Couldn't tell that much difference, low to mid range was still laggy like before, not much untill 5k rpm. The pick up might be slightly better but can't say for sure as I've only driven it for a short while.

Best thing gained it now shoots little flames on soft limiter cut. Will be installing intercooler hard pipes next week, hopefully this will make more of a difference.

mr skidz Veteran

mr skidz

Posted
Posted

Update:

Installed Tomei dumps this week ( Bought HPI dumps but couldn't fit on my R34 Gt-R, 15mm too short, would only fit R32/R33 apparently) and "hi flowed" the twin cats of my Nismo exhaust.

Result:

Couldn't tell that much difference, low to mid range was still laggy like before, not much untill 5k rpm. The pick up might be slightly better but can't say for sure as I've only driven it for a short while.

Best thing gained it now shoots little flames on soft limiter cut. Will be installing intercooler hard pipes next week, hopefully this will make more of a difference.

twin cats?

why 2 of them?

I don't want the one I got already lol

who tuned it and what they say it could be

baicai Community Regular

baicai

Posted
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twin cats?

why 2 of them?

I don't want the one I got already lol

who tuned it and what they say it could be

Twin cats because it's a Nismo exhaust twin 2.5 inch into 3, still saving up for a bigger exhaust, so this will do for now. Car was previously tuned by JEM and will be on the dyno soon once all the parts are in so hopefully a tune will fix things up a little.

baicai Community Regular

baicai

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Doubtless been asked and answered but what boost controller do you have. Need to be sure the wastegates are shut unless you need them to be otherwise.

Boost controller are profec B II, not too sure how too adjust it, so gonna leave it to the tuner.

GTRsean Grand Master

GTRsean

Posted
Posted

Hpi dumps not fitting is news to me. I bought some that were originally on a 33GTR, bolted straight up to my 34GTR setup (GTX2860's now -5's) no problem.

You sure they didn't try to fit them back to front lol?! as they are different for front and rear.

GTR_JOEY Grand Master

GTR_JOEY

Posted
Posted

Hpi dumps not fitting is news to me. I bought some that were originally on a 33GTR, bolted straight up to my 34GTR setup (GTX2860's now -5's) no problem.

You sure they didn't try to fit them back to front lol?! as they are different for front and rear.

Shit son, haven't heard from you for a while

  • 3 weeks later...
baicai Community Regular

baicai

Posted
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Posted

Hpi dumps not fitting is news to me. I bought some that were originally on a 33GTR, bolted straight up to my 34GTR setup (GTX2860's now -5's) no problem.

You sure they didn't try to fit them back to front lol?! as they are different for front and rear.

Bought it from just jap, even they didn't belive me. But putting stock next to HPI and Tomei you can see that HPI was a bit shorter, unsure why, so they happily swap it for me.

  • 1 month later...
baicai Community Regular

baicai

Posted
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Posted

Update: Car has been tuned and dynoed.

First run: With only thing changed to the car being tomei dumps and 'high flow' cats. Not much difference at low and high revs, made extra 4 kw at peak, this could be due to change in temp or other variables. But did gain some mid range torque and peak boost happening maybe a bit earlier, nothing spectacular but the dumps and cats did make a small difference.

Second run: Now installed with Nismo hard pipe and Nismo 100mm intercooler, 1000cc injectors, 450L fuel pump. Peak power gained of 17kw to 313kw atw at same 19psi. More power and torque across the rev range, biggest difference is peak boost happens at 4550 rpm instead of 5000 rpm.

Drive: Car definitely feels more more responsive and pulls harder, response is still a bit slow compared to stock turbos but it's much better than before.

Cost: $1000 for every 100rpm of response or $300 for every kw gained, f expensive.

Conclusion: I think we are half way there, next on the list will be bigger exhaust and turbo inlet pipes.

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