breeza - yep, warm up car, on a hot day, advance alittle at a time, then thrash it with a/c on. You do it until it pings and then retart 1-2 degrees, try again, until you get the right setting so it doesn't ping. Advancing the time will increase the high rpm not the low. If you want low rpm you wanna retart.

I did this in the day when i didn't have any timing gun etc.... (young & reckless days) it works.