hoskib

iTrader: (1)

read this in a few threads now, what are the symptoms of boost creep?

(no problem with my car, just would like to know)

ta

RB5_245

Boost Creep is when you reach your target boost, then it 'creeps' higher

Could be down to a poorly set up boost controller, wastegate too small.........

Dave

XNWRX

You won't have any boost creep with stock TD04 turbos. It is common with STi7&8 (VF35 turbos) when exhaust has been changed for a bigger or decat one.
Boost creep usually happen when you reach high rev. The wastegate is fully open, trying to decrease boost level to an acceptable value, but exhaust gaz continues to power the turbo so that boost continues to increase ! The more you reach high rev, the more your engine produces exhaust gaz and the more the boost increase....etc ! That's very dangerous for the engine life!
Good turbos doesn't produce boost creep ;-)

hoskib

iTrader: (1)

ah, got it (me, not the car)

cheers

TonyFlow

I believe it has been known on TD04's - also had it on my VF28 (Turbo cant be too bad as its fitted as standard to my STi 5 Type R

dowser

"Good turbos doesn't produce boost creep ;-)" You mean good wastegates?

Tony - I've never seen a td04 on stock actuator creep; it's hard to get any boost out of the damn things above 6k!

XNWRX

You're right Richard, good wastegate. The VF35 is a very good turbo (for no more than 350+hp), but the wastegate has to be ported to sort-out that boost-creep problem.