Steve will chime in here I'm sure, but as I understand it, the forced induction generates heat, and heat promotes the onset of spark knock. The more boost you run the more heat you generate, so you should retard the timing acordingly. As you retard the timing, you are taking away potential performance, so pull timing, but no more then necessary. If you are running an intercooler you don't have to retard the timing as much because the intake air is cooled. Lower compression ratio also lowers the temps in the combustion chamber, and the forged internals will hold up better to the spark knock episodes if, and when, they do happen. Retarding the timing will almost always lower the performance, but the gains from the added boost outweigh the losses form the pulled timing.

Originally posted by scalbert
I'll have someone else driving while I am tuning and will still log.

Originally posted by types1967
i havent had my throttle body stick even when it was 9degrees outside