Originally Posted by urban_cowboy

Kalli, I had some detonation issues last year that came pretty much from running too rich at WOT. Once I got a handle on the AFR, my detonation issues basically went away. Follow the AFR. It does not lie. Max power is going to come around 12.5-13:1. The best fuel efficiency, for me, is low 14s b/c anything higher causes lean surging. I can really tell when I hit the secondaries because my AFR goes from 14s to 12s and my power kicks in like a nitrous hit. If your all your plugs are firing (a misfire will show a leaner AFR...crazy I know), then make sure your AFR is set right throughout your throttle movement and under load and cruise. Once you have that set, get a friend to drive with you that can hear the pinging and do some WOT pulls. You can increase the timing a little bit at a time and then do another WOT pull. Stop when your friend hears the rattling marbles. IMO, AFR is going to affect your performance MUCH more than a few degrees of timing. I consider timing adjustment, fine tuning.