What Boost do You run on your RB25?

[geno8r]

Hi just wondering what boost people are running on their RB25 Stock engines?

I'd like to know what psi the Rb25 is capable of on with stock Headgasket & pistons,

and also what Psi people are running if they are using aftermarket Headgaskets & or Pistons on their rb25.

I'd like to know how much power a GTST can really make.

I'm currently running 12psi giving me 230 rwkw, down the track I'll up it to 18 psi. A guy i know runs 20 psi on his gtst running stock interals & makes 430 rwhp. I'm pretty sure he has stock headgasket, anyways some feed back would be great.

Cheers!

With replys, please keep them simple, no massive details about your car, just Boost related info on the rb25.

[Dynamix]

I've run 1.2 bar a few times, but only for very very very short squirts, maybe a min at a time if that. I usualy dont boost past 12psi and run it day to day on 8psi with me turbo smart dual stage boost controller. turbo is a gcg stage 2 upgraded stock unit, not sure how much rwkw i have, need a tune. I also have a neo6 in my r33 if that'd make any difference.

Cheers

[croat]

Why do people get dual stage boost controllers??? why not just leave it at 1 boost setting and drive softer and easier to save fuel with just a bleed valve? Also if you tuned your car to lets say 12psi with the dual stage controller and later turned it up to 16psi (high boost), wouldn't your car run lean as the air/fuel mixtures would be out?

[geno8r]

Please dont side track this thread, I'm wanting Boost levels on Rb25's only.... Thanks Boro.

[KamikazeR33]

ceramic coated bore, ceramic pistons running 20:1 compression on 1.5 bar boost

[KamikazeR33]

haha sif

i wouldnt run anymore than 20psi on std rb25

[R31Nismoid]

boost has little to do with it.

Its more a question of how much air your turbo is flowing.

Some turbos flow more than others at say... 15psi.

So trying to compare by way of PSI wont work.

Basically, if your not pinging, have upgraded injectors etc etc.

Then there is no problem in basic. But how long the motor would last say making 270-300rwkw on stock everything with track beatings. Who knows.

again, thats unrelated to boost

[geno8r]

Yeh I know that bout Psi, just wondering what psi people are running anyway... From now on when you post your Psi, post your turbo too!

[LBR33]

Without a stock turbo 16psi is a good setting but as day to day driving.

[Dynamix]

Why do people get dual stage boost controllers??? why not just leave it at 1 boost setting and drive softer and easier to save fuel with just a bleed valve? Also if you tuned your car to lets say 12psi with the dual stage controller and later turned it up to 16psi (high boost), wouldn't your car run lean as the air/fuel mixtures would be out?

A) the car came with a boost controller allready in it B) ever tried to drive with say 12 psi or above in the wet? its not to practical for day to day driving with a stupid amount of boost, its uncomfortable and chews through the petrol C) after market computers adjust the ratio's so it doesn't ' lean ' out, how do you think every other boost controller works in the world?

[R31Nismoid]

Yeh I know that bout Psi, just wondering what psi people are running anyway... From now on when you post your Psi, post your turbo too!

even then, there are like 20-30-40 differnt combos of some garrett descriptions as you can change wheels and all sorts of things.

again, if u just wanna know PSI, then no worries, but PSI wont have a lot to do with blowing a stock motor. Much bigger factors involved there so if you wanna know "how much an RB25 can make" and i assume u mean a stock one, then you aint gonna find a good answer.

and 16psi through a stock turbo. Oh dead.

hope you have some spare $$, cause its gonna be dying very soon.

Much over 10-~12psi the stock turbo is doing stuff all anyhow so its no use taking it any further.

[R31Nismoid]

B) ever tried to drive with say 12 psi or above in the wet? its not to practical for day to day driving with a stupid amount of boost, its uncomfortable and chews through the petrol

if you got a controlled right foot its very practical.

i'll drive mine day-to-day @ 16psi ~ 270rwkw and no dramas from my setup.

its about sensibility and being controlled, more so than practical.

[nismo33]

On a stock R33 GTST-- you can run on 14 PSI max...dont push it..unless you're ready to replace your turbo... push it more and you're looking at replacing your engine.

Run your stock gtst on up to 12psi tops and leave it to 7psi for every day driving.. this way you will give your turbo and your engine a longer life.

i know someone who pushed his R33 to 23 PSI..he has big turbo..and yet he managed to blow his heads,crack all pistons..ended up geting a new engine which cost him 7k..stupid really.

[Dynamix]

if you got a controlled right foot its very practical.

i'll drive mine day-to-day @ 16psi ~ 270rwkw and no dramas from my setup.

its about sensibility and being controlled, more so than practical.

My car spins no matter how lightly i drive in the wet, its the tune of the car, i'm a conservative driver talking from the way my car behaves, maybe it has something to do with the suspension settings or shitty tyre's or how hard the turbo comes on, but all i know is it spins, and thats why a boost controller is a good thing.

[geno8r]

Yeh good point R31Nismoid. I run a VL t3/t4 High Flowed on my rb25 @ 12 psi, The turbo is great, my dyno tuners were very impressed with it making such efficient power, they asked me where i got it from but unfortunately, i dont even know, came with the car.

[Sydneykid]

As the guys have already posted , boost is irelevant. I have a T66 that makes 400 rwkw at 1.4 bar (upgraded internals) and a GCG ball bearing hi flow that makes 265 rwkw at 1.3 bar (standard internals). There is no way the standard internals would handle 1.3 bar from the T66. I work to the ther rule of thumb limit for standard internals on an RB25DET as being ~450bhp. Whether you use 1.1 bar or 1.6 bar to get there is not the issue.

[Lepperfish]

Well said SK..

[geno8r]

Then 450 bhp @ the engine is my goal! I'm making 309 rwhp, this might be around 380 hp @ the engine right?

[INASNT]

1.4 bar with a Garrett 3040 stock internals

I have observed 99 ping reading on pfc once, and was like WTF????

[Spook's_Skyline]

11 psi