Quote:
Originally Posted by hellokitty
What is the optimum gap for NGK 97506 on flex fuel? I hear .020 is the best for E85 use, but since I am planning to switch off between 91 and E85, can I still run .022 or gap down to .020?
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I am curious to know what that "happy medium" is as well regarding FlexFuel usage - with the understanding that the happy medium spark plug gap will not be fully optimal for an E85 specific tune or 91/93 oct tune, but ideally would be more than adequate. When the time comes for me to execute the FlexFuel hardware upgrade, I will be operating my M3 anywhere between a stock CS tune up to a BM3 Stage 1 tune, using fuel grades between 93 oct and E85, on the street or on the track.