Timing with a Procharger

I think the problem lies in the pump gas deal. What heads are you running? Pump gas is not real conistant, so getting closer to the edge of detonation with it may be a bad thing. I'd suggest a few things. Grad a timing master, where you can dial up or down to adjust the timing, then get some dyno time with race fuel, and std pump fuel. I'm assuming the engine has good pistons,(built for boost) already. Then, experiment a little. The second the engine goes into detonation, the EGTs go up significantly, or it beahves strange, stop dialing more. With good chambers and alumiunm heads, I'd think somewhere between 30-32 on pump fuel would be the limit, and closer to 35+ with race fuel. Also keep in mind, you are adding a lot of stress with that extra timing, so if you have trouble hooking the car now, the whole exercise is just a waste of effort, and tempting breakage.