Quote Originally Posted by green91
afr for optimal fuel usage and afr for optimal power are often different. most performance related vehicles will run slightly rich to ward off spark knock, and can allow a little more advanced timing. I would imagine 14.5:1 - 14.9:1 at idle, and approx 13.1:1 - 13.5:1 would be close for WOT, N/A. obviously the best bet would be to put it on a dyno and also have a detonation detection device of some sort.
Good info right there