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i knowthis may belong on the two wheel forum but it is a turbo question.just ran in phoenix,twin cylinder 45 degree v twin,p trim compressor,.81 exhaust housing.it would only make 21lbs of boost and appeared to be blowing the waste gate open,it would make 21 lbs of boost in the first .900 seconds which appears to be to fast.if the exhaust housing is to small can this happen???any suggestions on a exhaust housing???
 

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Custom Engine Shop
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3,812 Posts
Put a pressure tap into the exhaust and check back pressure 1:1 is ideal 2:1 is not so good.
If it is making 21psi of boost and has 55psi of back pressure a bigger hot side is needed.
 
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