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spike_africa · 04-30-2008, 07:36 AM

The number of cylinders has nothing to do with what octane to use. Its a matter of a/f ratios,timing, and compression is what determines what octane is needed. Your GT uses 87 if you have the timing bumped try 89 if it pings your stuck with 93 unless you put the timing back to stock to use the cheaper 87 gas.

04-30-2008, 07:36 AM	#13 (permalink)
spike_africa Administrator Join Date: Sep 2004 Location: Orlando,Florida Posts: 6,957	The number of cylinders has nothing to do with what octane to use. Its a matter of a/f ratios,timing, and compression is what determines what octane is needed. Your GT uses 87 if you have the timing bumped try 89 if it pings your stuck with 93 unless you put the timing back to stock to use the cheaper 87 gas. __________________ Dustin 2002 GT Mustang 5-Speed Drag Radials,Sprayed,Powershifted WOOO HOOOO!