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Old 12-03-2003, 04:48 PM   #24
Scooby Specialist
Member#: 23359
Join Date: Aug 2002
Chapter/Region: NESIC
Location: San Francisco
2002 BMW M Coupe
Steel Gray


There's a very good reason to tap after the throttle body, as you said yourself in the very first get more boost. If you don't wanna mess with a boost controller, this is the perfect way to raise boost a couple psi.

And to answer your question Q, it doesn't matter what pressure you're running. The turbo will push as much boost as it can (depending on turbo efficiency and current exhaust flow) until the right amount of pressure gets into the manifold and then back to the wastegate. So if you have the same turbo at the same RPM, a car with wastegate spring of 4.5psi and a car with 10psi spring will both have the same pressure in the charge pipe.
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