Quote:
Originally Posted by Al Man
guys i use shell v power racing which is 100 octane, am i wasting my money..
my dealer said its best to use it, but also that its best to just stick to one type, but he may work for shell in his spare time!
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I don't think the ECU can take advantage of anything more than 93 or so. It needs to be able to deal with a range of fuels without doing damage to the car. In California, we have 87 octane through 91 octane. The ECU has to be able to handle 87 octane without blowing up even though the car "requires" 91+.
The conventional wisdom at the track is that 50/50 100 octane/ 91 octane is about the most our stock ECUs can take advantage of. My brother's car has an OBDII programmer that flashes his ECU for 100 octane. If he then uses 91 before he flashes it back he can screw up his car.