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Old 04 Apr 2013, 09:13 PM   #1 (permalink)
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Question low boost

hi all,

ive had my impreza 99 reg uk turbo for a while now and have never really been bothered about this but I seem to have lost a bit of boost.

when I first got the car it showed on boost gauge as boosting at 1.1 bar (although the gauge was old so not going too much on accuracy) but now after replacing the vac hose from t-piece to engine/intake it only shows .5/.6 bar and definatly feels less rapid.

car has full stainless exhaust, de-cat and was previously re-mapped

I have heard of the restrictor pill that hides in the pipework round that area but am unsure of exactly which pipe it is so may have inadvertently removed it when replacing the pipe.

any help would be much appreciated

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Old 10 Apr 2013, 01:28 PM   #2 (permalink)
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Re: low boost

I'm having a issue also, been reading on imprezas standered boost is around 1.1 bar
I've just bought a 1997 wagon import manual with upgraded exhaust and dump valve and induction kit but its only pushing around 0.5 bar and 5th gear seems really flat in power??
Any suggestions please
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Old 10 Apr 2013, 07:45 PM   #3 (permalink)
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Re: low boost

the 99 UK turbo only does 0.9 bar boost as standard
Scoobypedia | Trusted knowledge for everything Subaru | Knowledge / Boost Pressures FAQ

you two may find this link useful
Scoobypedia | Trusted knowledge for everything Subaru | Knowledge / Boost Related Issues
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Old 10 Apr 2013, 11:26 PM   #4 (permalink)
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Re: low boost

Thanks, I have a spare wastegate solonoid which I will try tomorrow. The boost I'm reading on the boost gauge sounds as if it could be opening at spring pressure like it says in that link. Fingers crossed it solves the issue and I get my boost back lol.

I'll let you know how it goes and thanks for your help
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