Originally Posted by mcowger
If anything, the Cobb maps on the AP are pretty rich, not lean.
That's only partially true.
Yes, they run quite rich on the topend (> 11, tapering down to 10 afr starting at around 5k rpm).
The problem is at the onset of boost. My car would hit 15psi of boost at 3200rpm, but my AFR at the same engine speed was still 12.0. IMHO, that is far too lean, and explains why my car would be VERY picky about the quality of fuel it would run -- and the IAM would definitely show this by varying from 7-8 on crappy brands, up to 15-16 when using BP/Amoco fuel.