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  1. #1

    E85 tune question

    I live in an area that is a little far removed from the nearest E85 station. I would like to take advantage of the E85 tune to see what it is like. Is it possible to utilize high octane gasoline with say an octane booster to get something similar to the E85? Do the people using the E85 have any other option than to purchase E85 at a pump? The nearest place is a 90 mile drive from me, so I would like to find another option. Otherwise, I will just stick with the 109hp tune... thanks.


  2. #2
    E85 is not high octane,it cant be imitated with fuel additives. Do you have some one local that sales VP race fuel? They sale the best E85 you can get,way more consistant than what you get at the pumps. Its an option

  3. #3
    xdrian's Avatar
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    I wouldn't drive 90 miles for E85 stay with the 109 hp


  4. #4
    GasResearch-VT.SE's Avatar
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    e85 and petrol tunes are not interchangable.

  5. #5
    ride it like you stole it!!! raceneked's Avatar
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    Quote Originally Posted by Born2Ride View Post
    E85 is not high octane,it cant be imitated with fuel additives. Do you have some one local that sales VP race fuel? They sale the best E85 you can get,way more consistant than what you get at the pumps. Its an option

    you are mistaken.

    We did a comparison test of two fuels, regular gasoline (87 octane) and E85 (100 to 105 octane). Our test vehicle was a flex-fuel 2007 Chevrolet Tahoe 4WD LT powered by a 5.3-liter V-8 hooked to a four-speed automatic transmission.
    http://www.caranddriver.com/features...economy-page-7

  6. #6
    When I say high I mean its not 112-120 octane like some race fuels...And its not a consistant octane,thats why I suggested the VP E85...E85 out of a pump is very inconsistant,octane depends on seasonal blend...It must be tested if being used in a race application.

  7. #7
    boost junkie skidoochris's Avatar
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    no na spark could ever use anything close to 110, you could never add enough timing to burn race gas
    with a 11:1 na motor even 100 octane is at the high end

    I will bet you can not feel any deference in a 100hp tune and a e85 tune

  8. #8
    xdrian's Avatar
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    I have now gone E85 after 160hrs on 98 and the 402 tune. now @ 175hrs and E85 is about 40c a litre cheaper than 98

    It has more mid range grunt and a little more top end due to higher rpm running @ 8400




    Quote Originally Posted by skidoochris View Post
    no na spark could ever use anything close to 110, you could never add enough timing to burn race gas
    with a 11:1 na motor even 100 octane is at the high end

    I will bet you can not feel any deference in a 100hp tune and a e85 tune

  9. #9
    boost junkie skidoochris's Avatar
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    Australia 98 is us 93 octane

  10. #10
    hill160881's Avatar
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    It has to do with the air to fuel ratio needed for gas vs ethanol. Gasoline needs to run around 14.5:1 to stay cool and about 12.5:1 for maximum torque. Ethanol needs 9:1 to run cool and achieves Mac torque around 8:1.

    So an e85 tune will need to dump 20-30% fuel than a gasoline tune will. If you run gas on an e85 tune you run wayyyy to rich.

    The best way to think about octane is to think of it as a flashpoint. Lower octane fuels are easier to cumbustion and require less heat to ignite. Higher octane fuels are harder to cumbust and thus need more heat to ignite. This is not related to its air fuel ratio, which is easy to think of as how much air you need to fully cumbust a given fuel.

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