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      10-06-2012, 03:52 AM   #4
MStar
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Drives: e92 M3
Join Date: Oct 2012
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OP think of high octane fuel as protection..the tendency is for people to think high octane fuel makes more power..the reality is high octane fuel is used in performance applications where you want to take advantage of higher ignition and intake mapping and avoid detonation..thats it in a nutshell..if you dont have the proper ECU mapping to take advantge of the higher octane fuel it doesnt make more power..all it does is provide added protection against detonation, knocking, pinging etc

There is slight headroom for improvement on stock ECU..up to about 95 seems to be the max