[607Motorsports]

AFR is entirely dependent upon each individual car... I know on my Cavy it can run a 12.0 on pump all day and never have any issues whatsover. If I attemtped to run a 12.0 afr on my Cobalt it would likely break the ring lands after only a couple passes. The Cobalt needs to run a bit rich in order to compensate for the unequal fuel distribution the rail provides to the #4 cylinder. Right now i'm at 11.3afr on pump and will leave it there for safety seeing the car is my DD.