I have 12 degrees locked timing at 12 psi and I have been racing my car w/o a tune since replacing my head gaskets and haven't heard a hint of any detonation.
I never had one, I bought the S-Trim as a tuner kit. I bought my MAF, 42# injectors, 255 FP & Power Pipe separate. I set timing to 10 and ran 40 #'s of fp. It was where my car was at prviously with an n2o set-up.
What the hell, Ive been driveing my car around for like a month with out a tune and I havent had any driveability problems at all. Ive hit plenty of boost and all that. I also got 36# injectors, and a 77 MAF. The guy I bought the MAF off of said it was sent to pro-m to be calibrated for 10 #'s. Is that why my car drives/idles/whatever fine?
The answer is easy -- do not let it get into boost on the way to the dyno. I don't know about you, but I can drive my car at normal speeds all day long without ever going over 25% throttle.