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Discussion Starter #1 (Edited)
would like to know what is better? 87 octane no ethanol or 91 octane with up to 15% ethanol ,this is in a 5 psi procharged with intercooler .9.1 comp. 5200 rpm
 

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I don't know for sure but running 87 in a boosted motor will most likely transform it into a blasted motor.. And no problem running ethanol in anything as long as it's tuned accordingly.....
 

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Give the motor what it wants...both in octane and tune.

The E15 won't store the same so do your homework on that part also.
 

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Well, that is very little info. And 2 poor choices. (not on your part, thank the govt) How much compression? Blown boosted? Turbo? Intercooler? RPM range? etc.
Wags
 
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