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      01-25-2012, 08:00 AM   #592
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Drives: 08 E90 M3, 99 E36 M3 Turbo
Join Date: Feb 2011
Location: Concord, NH

iTrader: (3)

Originally Posted by BMRLVR View Post
Please tell me how catted vs non catted effects boost on a supercharged car?

Backpressure and EGT's may have changed, but not boost!
Boost is a measure of restriction through the engine. Improve the engine VE by decrease the restriction on the exhaust end and boost will drop. This is true only with belt driven forced induction because the supercharger output is fixed. With exhaust driven forced induction, the wastegate will regulate the turbo input and thus output in order to maintain boost at the set point.