Need Advice from E85 veterans/longtime users-

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  1. #1

    Default Need Advice from E85 veterans/longtime users-

    Hello Everyone

    Would some of you E85 users please give me some solid advice regarding the rare and in frequent use of E85 in a GT500. I presently have 2 tunes on my SCTX4. The 1 is for (E10) 93octane and the other is for VP MS109. I run 93 octane 95% of the time. MS109 is about $80.00 for a 5 gallon jug.

    The car is Not tuned for E85 and at this point I do not plan on considering it for a while.

    If I "splashed" 3 gallons of E85 Would such limited use and only using 3 gallons at a time diluted with E10(93) harm an of the OEM parts such as the injectors injector coils ,fue lines, plastics, fuel pumps etc?

    My intentions would be to add 3 gallons of E85 to about 10 gallons of (E10)93 oct fuel. I am slightly familiar with the different stoichs of 93 octane vs. E85.I also understand that E85 needs approx. (+/-) 30% more fuel in the tune.

    One of my reasons to consider this would be to increase the effective octane and allow the motor to delay any knock sensor activity. I could be very wrong with my assumptions here that im making. But that's the reason why I would like a few of you to chime in. I have Never used E85 before But it is now available locally at 1 station.

    Thank you

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  3. #2
    Senior Member Array smashedheadcat's Avatar
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    In closed loop (part throttle and below) the components you mentioned will be just fine, but any operation in open loop (heavy on the throttle), your car will command and obtain a severe lean condition. Essentially, you'll get all of the negative and none of the positives of ethanol. Do not do this.

  4. #3

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    Thanks for the quick response Josh.
    You answered most of my questions but because I was unclear, I dont think you specifically answered 1 of the parts im concerned with.

    I understand that in open loop(heavy to WOT) I will run lean by adding E85 to my present E10 tune.

    Let me rephrase/change part of my question since you answered most of it......

    If I had the car "Tuned" specifically for E85 on a chassis dyno like I already have done for E10 and MS109, BUT did NOT change any of the OEM equipment other than possibly the injectors........in your opinion,

    would running E85 in rare instances.....couple times a year(10 gallons at a time x couple times a year( 3-4 times)=30-40 gallons of E85 harm any of the factory OEM parts.

    Thank you

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  6. #4
    Senior Member Array smashedheadcat's Avatar
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    If you are tuned for e85, you do not need to worry about any of your fuel system components simply failing from ethanol use.

    I personally would not store my car (long term) with a lot of ethanol in the tank unless you take some steps to preserve it. That’s the only issue I can think of.

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