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My 12.11 comp. heap cranks at around 170 w/275-280 [Email]dur.@.050[/Email] and runs fine on 91 but, I ALWAYS mix in 110 when racing........do I need it? Not sure but gas is cheap and pistons/rings arent.



I lost a good 3/10ths down track using 116 race gas , the motor is 9.5:1 & i was using the 116 for nitrous , ran the motor NA on the 116.

If the motor does'nt warrant high octane fuel it will always slow down , you can add advance to the motor to compensate but the more advance you give the motor the more it will slow the piston down.