Quote:
Originally Posted by mithiral67
For the second item, sounds like you are overshooting boost due to wastegate differences and its being controlled by TP closure.
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That is my current theory on my throttle closures, though I'll have to pull some logs in the next day or so to try to confirm. I now generally see about -8.5psi on idle, dunno why I was only seeing -6.5 that one day.
I'm thinking they changed where boost is measured so you now get the vaccum pressure at idle correctly. -8.5psi is something like -17inHg and I think the consensus is that -18 to -21 is 'normal'.