This is a discussion on Engine Ping within the Internal Engine forums, part of the LSx Technical Help Section category; Originally Posted by qwik219d9 I was thinking my ORY was hitting the floor creating false knock had it closely inspected ...
01-29-2010, 04:47 PM #61
If you are referring to your mods in the previous highlighted post,,,then your combo is very similar to my wifes car with the exception I run the LS6 intake instead of a Fast.
On her tune, I had timing at 26 degrees in the upper sections of the table at WOT, with an AFR of 12.8 and 94 octane it was fine. I may have gotten away with more timing since it has a mild camshaft, but I never tried.
Living here now with only 91 octane I was getting 2-3 degrees of knock in just a few of the upper rpm tables. So I pulled 2 degrees out (now at 24) and it seems to have subsided,,,with only a few blocks that pop up and show 1 degree of knock. I don't even worry about that.
I'd make sure your AFR is straight first, somewhere in the 12.6-12.8 range to be safe. That's where I like to see it on a street car running crappy pump gas. I'd rather give up a few ponies and keep my pistons.
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