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Tune? E85 to 93 or vise versa

Discussion in 'FAST Support Forum' started by Turbopowered68, Sep 18, 2017.

  1. Turbopowered68

    Turbopowered68 New Member

    Mar 28, 2017
    If i am on my E85 tune could i just change the fuel Cal value and fill up with 93 keeping the same tune?
    BTW when i am on 93 it's for cruising and long distance travel NO getting on it at all.
  2. Fastmanefi

    Fastmanefi Active Member

    Jun 4, 2011
    Sonora, CA
    Assuming the spark timing is safe it should work, but I'd pay attention to the O2 correction % after the change.
  3. 9secondz28

    9secondz28 Member

    Jul 4, 2012
    I’m kind of the same but I have a very rough 93 time with 10lbs boost only for street driving and I want to start to do e85 before the dyno

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