jrt1990

With my mods listed (sig), should I be buying a higher octane fuel or is 87 octane just fine? An older friend of mine used to have a 92 Mustang that dynoed near 425 horsepower (which is whyI want to believe him)and he thought I should get 93 octane.

87ttopGT420

nope not enough mods to worry about premium just make sure timing isnt advanced to much

PX429

depends on your tune

But yeah tune your car to run 91 (you get better dyno numbers)

XSRACINGGT

I always ran 93 ONLY in my 87 GT, even before the Heads and cam. It spark knocked if I ran 87. Course, I ran 13* timing all the time. I think the car runs better on higher octane gas personally

jrt1990

K Thanks jw because we ran 93 octane for 2 hours when we were driving it back, would that hurt it at all?