FoxGT

Hmm I always ran 14 & 89 octane. Like vfast said, it's not worth paying extra for a couple of hp. Mabey if you are headed to the strip. When the power starts going down from advancing too far has some to do with the type of cam you are running also.

bigdaddy408

Try 6 degrees, works for me

619socalstang

mine works best a 10 degrees.

mustang8719

Mine always ran the best at 14.

bobby

does more timign wear on pistons?

grabbem88

every motor is different guy's........heads,cams,intake,and compression.some cars will run there peak at 12*
and then you'll see guy's running 20* it also determines on how well your car utilizes fuel too. it basically boils down
too how well your car is tuned.....i'm at 18* 42psi, 13.2 A/F. i know people are going to say WTF! i drove to michigan and back (i live S.illinois) a dozen times and never had a problem.

roundman

not unless you are running into predetonation which can damage the piston ring lands.
and it's the total engine timing that really matters the most, not just the base timing set with the engine at idle speed. as engine speed increases, the timing has to increase in order to ignite the fuel/air mixture sooner to get the most efficient burn rate and combustion power produced with each power stroke of the piston. this timing increase usually reaches a peak value around 2,500+ rpms and will vary greatly from engine to engine but around 33-36 degrees BTDC is about the maximum number used by most naturally aspirated engines.
total timing varies based on several factors including but not limited to combustion chamber shape and volume, compression ratio, cam specs, piston dome shape, combustion air and fuel temperatures, and fuel type/octane.

grabbem88

thanks roundman i couldn't explain it that well.....once again wiseman speaks.....we sit down and listen.

bobby

thanks!