Need some tuning help from some of you Professionals.

[TheBlizzard]

Like I said, sounded like bad gas to me. By lowering the boost you are lowering your dependency on gas quality and octane rating. Burn that shit out of there while running low boost and then put some decent gas in. Turn the boost back up to around 20psi and set fuel back to where it was and see if you are still knocking. My guess would be that you should be just fine once you have some better gas.

For example, when I get gas from down by where I work (Treasure Island Casino) my car always knocks if I run more than 15lbs of boost. Now if I get BP/AMOCO gas I can run 18-19lbs with no one hint of knock. With that shit gas from down by work I get like 13 counts in 3rd and 4th gear. Thats not a ton but I can definetly tell when I have a batch of bad/low quality gas. Just because it says 93 octane doesn't mean anything to me, its all where you get it from. And Amoco gas works the best in my car with race gas being the alternative.