FallenPhoenix said:There's less actual fuel to burn the higher the octane rating, so the lowest you can go without pinging is best. If you do get a little knock you'll pick up some power with higher octane just by preventing detonation.
White Stang said:I always use 91
cronin49 said:wrong.
ShadowGT said:87, 89 or 91-93 all run about the same in my GT...actually it runs best with 89 or 87.
My wife's '00 V6 Stang pings badly with anything under 89. Only mods are duals and Densecharger
FallenPhoenix said:It's when the air/fuel mixture explodes before it should and basically pushes the piston the wrong way, which if you can imagine what's actually happening in the engine, is a very very bad thing. Many things can cause pinging but it's basically when the cylinder is too hot and ignites the mixture without the spark plugs assistance. Deposits in the cylinder, high intake temperatures and a dangerously lean condition can all spell disaster for your motor.
It sounds like little ball bearings bouncing around in your valve covers.DerekStangGT said:so how can i tell if im pinging? what does it sound like?
Ok I own a 2000 mustang GT with simple bolt ons, I have a diablo sport I2 tuner and it has the 87 street tune, 91 sport tune and the 93 race tune. I know these cars run perfectly on 87 octane when stock or nearly stock but I’m not sure which tune to install as the 93 racing tune is supposed to deliver more power but does it actually since these engines run optimum on 87 octane? Can I install the 93 race tune and still continue using 87 octane? I only have CAI, throttle body spacer, exhaust (stock headers) and 3.73 gears.
The tunes change timing curves in the ECU. Timing is one variable that can cause detonation with lower octanes but changing timing can increase power. With aggressive timing curves, you need the higher octane.
So if you plan on running the 93 race tune, you should fill your tank with 93, run it down and then top it off again with 93 and then install the tune.[/QUOT
Ok so it is ok to run the 93 race tune on an engine that’s built to use 87 octane? Cause these engines only have 9:1 compression to begin with