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.


how about you tune any turbo car @ 10+psi at 14.7:1 and lets see how long before it detonates itself to pieces. I generally tune my cars to 11.5-12.0:1 afr in boost and 14.5:1 part throttle driving.