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      08-05-2012, 12:16 PM   #1

AJG1137's Avatar
Drives: 2013 528i
Join Date: Jun 2011
Location: Bloomfield Hills, MI

Posts: 70
iTrader: (1)

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N55 - e85+93 OR race gas OR race gas+93

Hi all. Looking to change my fuel to get a higher octane and slightly better performance, and am ignorant to the best way to achieve this. I have an N55 335xi with JB4 (no flex fuel wires and no other mods). Would it be best for me to run a 20% e85 mix with 93 octane fuel, mix race gas with 93 octane, or just put 100% race gas in? I would plan to drive this way most of the time, so it wouldn't just be for "track use".