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Posted by gorper (more from gorper) on Mon, 31 May 2004 21:32:45
In Reply to: boost question for c900 guys, Dan90SPG, Mon, 31 May 2004 18:58:48
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If the needle twitches back quickly, then you're getting knock, either due to lack of fuel or not enough retard. APC is protecting your engine.
If the taper is gradual, then that's normal: APC is designed to taper boost shortly after 4500 RPM. To some extent, the taper is also a function of the turbo design.
On your '90, you can improve high boost by fitting a better downpipe that separates the wastegate flow from the exhaust flow. Saabnet sponsor Brad Schaffner at kcsaab.com sells them. They're for Mitsu turbos only, so folks with '90 non-SPG or earlier are out of luck.
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