It won't fail immediately but will definitely stress the fuel pump more quickly by running meth in the tank as opposed to port injection in the long run. That is why many running FBO with E85 are going with the upgraded LPFP and fueling kit from Fuel-It. I believe no companies out there currently source an upgraded HPFP for the N55, I could be wrong though. I am flashed with MP stage 1 and I normally just fill up 3-4 gallons of race gas plus unleaded octane booster to bump up the octane to roughly 95, better to be safe then screwing up the car I guess... lol
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Originally Posted by DigitalNav
Also, PTF got back to me and said they don't recommend E85 on N55 engines. Any one else? they said HFPF will fail.
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