Guest boo Posted September 4, 2007 Share Posted September 4, 2007 I own a Gt4 celica st205 I have downpipe bluie flame exhaust, Hks air filter and I-colour SBC and blitz dump valve. When i accelerate hard the boost reaches 1.1 then just drops down:search: to 0.9 as i go faster through the revs. Anybody got any suggestions Regards Boo Quote Link to comment Share on other sites More sharing options...
ADL Mark Posted September 10, 2007 Share Posted September 10, 2007 You'll get far more response posting up on one of the (many) GT-Four forums. Sounds like a boost leak somewhere, or weak actuator opening the wastegate too easily. Quote Link to comment Share on other sites More sharing options...
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