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E15 on Cobb 91/93 Tune??

Discussion in 'EFI Tuning Questions and Engine Management' started by Coyote Chaser, Feb 23, 2021.

  1. Coyote Chaser

    Joined:
    Feb 10, 2021
    I know my Ecoboost Mustang will run on E15 fuel. But I have a Cobb tuner and am using the Stage 3 (93 octane) map. Any thoughts on how the car will respond??
     
    Coyote Chaser, Feb 23, 2021
    #1

  2. tbird

    Joined:
    Sep 1, 2004
    Respond to what.?
    Are you adding the cobb tuner?
    99% guaranteed that if you are using pump fuel , you already run e15 unless you have been going to ethanol free pump.
     
    tbird, Feb 23, 2021
    #2

  3. Coyote Chaser

    Joined:
    Feb 10, 2021
    Am hoping to boost my octane a little, end of last season, while racing at Michigan, I put some 91 octane in my tank. I normally run 93 octane, just wondering if a little E15 will cause any problems or confuse the ECU and create DTCs, etc.
     
    Coyote Chaser, Feb 23, 2021
    #3

  4. tbird

    Joined:
    Sep 1, 2004
    I doubt it.
    91 and 93 are both e15

    Ive known people that got check engine lights when they reached e30-e40. The codes where fuel trim codes from correcting for leaner mixtures.
     
    tbird, Feb 23, 2021
    #4
    B E N and Coyote Chaser like this.
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