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      01-22-2013, 09:52 PM   #47
CSMRX7
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Drives: 2008 E90 M3
Join Date: Nov 2008
Location: Calgary

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Quote:
Originally Posted by Gearhead999s View Post
Do these superchargers not have a bypass valve which is effectively the maximum manifold pressure control?If I remember properly these are are controlled by the ECU to control boost when the throttle is closed & maximum boost level which is also determined by pulley size.I have not owned a S/C car in over 20 years so maybe this is all an out of date technology.
The bypass valve is vacuum operated so it dumps boost when the throttle is closed like a BOV.
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