- Tue Jan 18, 2011 4:27 am
#233939
Even with a good tuner, 87 octane is too low, no one will ever tune a high 13 comp at the pump, not even me. With 87, the engine will definitely be knocking even though you cant hear it. If you have an easy supply of e-85 that would be the best way to go and its still pump gas. You will gain more torque, run cooler, and less chance of detonation.
If you have a REALLY good tuner ... no you don't. But you should to be on the safe side. Octane only prevents detonation ... which is good. I've seen a 13.5:1 motor run on 87 octane, but that guy was a crazy good tuner. For the rest of us ... stick with higher octane fuel.
Even with a good tuner, 87 octane is too low, no one will ever tune a high 13 comp at the pump, not even me. With 87, the engine will definitely be knocking even though you cant hear it. If you have an easy supply of e-85 that would be the best way to go and its still pump gas. You will gain more torque, run cooler, and less chance of detonation.