Thread: Low boost?
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      08-28-2010, 09:18 PM   #3
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Drives: '07 335i
Join Date: May 2010
Location: Bay Area

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Originally Posted by jblackwell View Post
I'm not familiar with how the KIWI device works exactly, but can you explain what the difference is in Boost and Intake Manifold PSI is? Also, what tune (if any) are you running?
I believe it's the value read from the MAP sensor in the actual intake and is absolute vs. relative. So this would be the absolute pressure of the air within the intake manifold after it's gone through the intercooler but before getting to the throttle body. I think the average sea-level air pressure is ~14.7 PSI, so this is just the relative boost added to that.