Safe Boost On Rb20det

[Phil Megroin]

Sorry if this has been asked before.

I've done a search and found a bunch of varying answers so i thought the best way to get an answer more applicable to me is to post the question myself.

I have an R32 GTST with the following mods:

Hybrid FMIC

Full Turbo back exhaust

Air Filter

EBC

What kind of boost can i afford to run without killing my turbo and/or engine?

I have an EBC which has the "Self learning mode" and it has learned my boost with those mods at 0.75 BAR.

However I'm inclined to think it can run more - how much more is the question.

Cheers.

[taylor]

run 1 bar or just under

[1400r]

get a 2530 pump and fcd

then run 1.3bar like me

he he

[silviline]

yeah ive heard that after 14psi the exaust wheel falls of is this true???

[ODessA]

i dont think running over 14psi is a good idea, prolly even better off to stick to 13psi however once u go over 12 or so u will get boost cut and the car will shudder and kinda cut as u go up the rev range, dont ask me what to do about that cause thats where im at atm

[ODessA]

actually i would imagine fuel cut defender is next on my shopping list

[1400r]

do it

for now then get a remap or pfc when you can afford it or be bothered

[black_32]

1400r what other mods do u hve

[1400r]

fmic

exhaust

fcd

walbro fuel pump

hks 2530

fuel press reg (although its not needed as last dyno tune they put it back to stock press)

have a look in the ceffy section under 2530 lag issues thread

[rmahnovetsky]

I've run 15 psi just once with the stock turbo and a bigger fuel pump (040) and hybrid cooler...No RR just nice and harder acceleration.. But I wouldn't do it again for safety reasons. Most people dont go past 12 psi. I know someone who run 13 psi without a problem but he only drags, turbo is not on for more than 13 sec at a time.

[ellie]

It will vary depending the condition of your turbo and the dickhead head factor of just boost it and see what it feels like. . . .POP! It has benn well documented that the ideal boost is at 0.8bar on a standard turbo. If you go higher the thermal stress skyrockets and you only gain 3-4Kw per psi from here.

Before everyone goes rank : This is only my oppinion which gets proven to me day in day out with my mates 32 = breathing mods and cooler running 0.8bar remapped & tuned safely toasts a lot of 32's running one bar that that have the same mods but its all of the the shelf gear.

Proof enough that simple mods done right you will reep the rewards!

[luke_1987]

if its a stock turbo then it mite hit 14psi but it will drop back to bout 11 as the revs get up cause it cant flow enough. and yes nethin ova bout 12 bit breack the ceramic wheel trust me i no from experiance

[Cubes]

I was only able to run 12.5psi before the fuel pump began failing causing the car to lean out.

Don't just wind boost up, throw it on a dyno and ensure its all ok.

Tuning, no detonation, correct spark plug heat range and driving style (no track work) + a little luck is the key to having the stock turbo hang in there at 1bar for a long period of time. Failing to do so will kill the turbo.

Other than that I ran up to around 1bar with no issues, at first with a bleeder that caused boost to drop back to around 12psi, then an ebc that held boost @ 1bar, then a wastegate mode with no ebc that held boost @ 1bar.

In my case 178,000km's (111,000km's @ 1bar) before it was dropped on the rb30det that only required 9psi to make similiar (but still more) power.

After a total of ~195,000kms the turbo is still fine and feels better than some perfectly good r33 and r34 turbo's i've seen, I pulled it off in favour of a larger turbo.

I'll keep the stock rb20det turbo should I ever have to drop it back on for other reasons.

[FATAZZ]

daily driver 14psi rb25 turbo on 32gtst

turbo back exhaust

pod filter

r34smic

boost drop to 11psi

bit of lag,but pulls hard to redline

my theory is,its only a $300-400 turbo, get what you can out of it.

the quicker it blows,the quicker you'll have to get it hi-flowed

[ellie]

Case and piont of my above statement! Cubes suggests with careful balance of tuning and boost control enabled him to maintain a Bar of boost where as RSTME suggests just boost it and if it blows buy a new one, so it comes down to what your happy doing to your car.