atmospheric bypass valve=positive results? - Saab 900 Bulletin Board - Saabnet.com
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atmospheric bypass valve=positive results?
Posted by kdub (more from kdub) on Mon, 2 Nov 2009 08:38:08
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So last night i pulled by bypass valve, plugged the hole in the intake and tried running atmospheric....thought I might get a louder dump sound...well no more sound that I could here...but it did wonders for the way the car is running...much stronger and smoother powerband....still great idle....and my boost seems to hold better without slowly losing boost before redline....what the heck could this be...i also had pretty unstable boost before this...not anymore!...all I have is an open cone air filter, 3.0 fpr, and a tweaked apc....(and a bosst gauge)...maybe its because my car is running a little richer now since that air is not being released back in..and also that air is hot...why would you want more HOT air back into the throttle body? I understand how the mass air flow sensor works and this the dump air is not being calculated but it seems to work just great...any ideas? and is it normal for this mod to not produce noticably louder blow off sounds? Thanks guys..this one is a mystery...
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