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Turbo boost

Advan_01

By Advan_01,
in Engines & Forced Induction

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rb25 Grand Master

rb25

Posted
Posted

sumfatchin:

0.76bar = 11psi (1bar=14.48psi)

I have never used tolulene but it would reduce knocking. Do a search and I'm sure you'd find some info on it.

The fuel cut dosen't work because I've completely disconnected the standard boost solenoid, so the ECU isnt getting a boost signal. (I'm using an EBC)

Advan_01:

I'm not going to take my stock turbo past 0.8bar now. On the very rare occasion I'd run 1.0bar (very cold nite, 1 run)

And finally, my problem definately bad fuel, I ran it out, and filled up with fresh Ultimate, reset the ECU, threw in some injector cleaner to be safe and it improved straight away....

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Steve Grand Master

Steve

Posted
Posted

Advan 01,

I would advise not increasing the boost much until you get a front mount (if you do get one that is). The stock cooler has a pretty big pressure drop, and as you measure boost from the plenum, you may read 10psi, but acutally be making 16+ - not good.

As the stock interwarmer does not remove much heat from the charge air the risk of detonation is greatly increased too.

With a full 3" system you probably already have around 9psi. The problem with the stock turbo is the ceramic turbine wheel, which is prone to shatter when under too much load. The load not only comes from exhaust pressure but also from the impeller trying to compress the air as well, so it cops it from both sides.

I have always been told to not increase boost unless I have a FMIC, and then only to go to about 12.5lbs (0.85bar). With 0.85 bar I made 203rwkw, so I was pretty happy. I never went above this and the turbo lived a happy life until I sold it and it was still in excellent condition.

I have heard alot of stories of guys killing their turbos at 1 bar (on an R33), doesnt always happen, depends on how long they boost it for at that pressure, and what sort of condition the turbo is in. But you cant guarantee it will last either.

I would recommend keeping boost to about 9-10psi on stock cooler, get a decent front mount, then go up to 12.5bar or so. With the stock cooler I doubt it would make a huge difference anyways between 10 and 12 psi.

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BOOSTD Mentor

BOOSTD

Posted
Posted

hate the stock interwarmers...hehe

anything over 12psi with the stock cooler gives stuff all power increase, The extra flow is negated by high inlet temps. FMIC will put higher boost to better use. Expect ~ 20odd rwkw with a good front mount and 1bar and a another 15-20 with a Power FC.

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