Engine/Power - EJ25T (STI and 2006+ WRX) Discussions about the USDM 2006+ WRX and WRX STi 2.5 liter turbo flat-four.

Boost creep on '05 STi

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Old 07-21-2004, 02:32 PM
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good Question!
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Old 07-23-2004, 05:19 PM
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I have an 05 STi, and I have not noticed a creep...yet.
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Old 07-24-2004, 10:19 PM
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Originally Posted by PyroManiac
I have an 05 STi, and I have not noticed a creep...yet.
no, still using exact same VF39 with the same P17 exhasut housing. Keep in mind that boost creep only happens when you add an exhasut, so this is an issue that Subaru has no interest in addressing for us.
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Old 08-01-2004, 12:22 PM
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Sorry for the newbie question, but what is boost creep?
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Old 08-01-2004, 03:10 PM
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Originally Posted by EnjoyTheView
Sorry for the newbie question, but what is boost creep?
Basically means that the turbo keeps putting pressure into the system even though the wastegate is open.

The wastegate is a sort of turbo bypass for exhaust that is supposed to prevent the turbo from cuasing excessive boost pressure.

The reason its bad is the turbo puts unwanted pressure on the system causing dangerous spikes.

There is a long thread on this issue in the "Threads of note" sticky
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Old 08-01-2004, 03:44 PM
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Originally Posted by JXN
What's the difference between boost creep and boost lag?
I guess thats the same as turbo lag which is the time it takes to spool up the turbo as produce boost in the car.
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