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      07-22-2013, 07:48 PM   #66
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Drives: E90 M3
Join Date: May 2011
Location: Colorado Springs

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Originally Posted by Alex07M3
Exactly, if the s/c spin at the same RPM no matter the air density, then the blower should build less psi when the air is less dense! No!? : Please, correct me if there's something I don't understand!

As for factory supercharged cars, like an S4, they have target boost just like turbo cars, so the computer will compensate for thin air by making the blower spin faster to produce that target boost, no!? : Maybe I'm beside the track here but if so drop your poutine and explain!
Actually the supercharged S4 uses a wastegate to reach it's target boost level.
Superchargers all suffer less than an NA application, but I'm sure there is some variance between the units. There's still a lower barometric pressure, so boost pressure will still be lower across the board.

You can have my poutine when you pry it from my cold dead fingers. That stuff is tough to come by. 1MOREMOD had to smuggle it in from Mehico in his man cave