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2008-2013 Cadillac CTS Performance Mods Discussion, E85 in Cadillac CTS Second Generation Forum - 2008-2013; Anyone know the ratio of E85 and gas for the DI engine without needing a tune?...
  1. #1
    Michael_atDell's Avatar
    Michael_atDell is offline Cadillac Owners Fanatic
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    E85

    Anyone know the ratio of E85 and gas for the DI engine without needing a tune?

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  3. #2
    C "T" ess's Avatar
    C "T" ess is offline Cadillac Owners Connoisseur
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    Re: E85

    My 2012 is shown as being flex fuel ready which to me means I could use full E85 without any problem.

  4. #3
    tinman's Avatar
    tinman is offline Cadillac Owners Connoisseur
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    Re: E85

    Anything in your '08 manual?

    I don't see anything good coming with E85. Nothing except money going to Brazil. What a waste of food. If we could process wasted vegetation, then that may make it a different story.

  5. #4
    wait4me's Avatar
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    Re: E85

    It isn't wise to mix ANY percent of it. The stoic ratio of the fuel changes dramatically and would be WAY to lean at wide open. The calibration is not setup to detect percentages of alcohol and is set to be safe only to about 10%13% ethanol blend. Which is what you get out of the pump already.

    Octane rating does go up but fuel requirements from the % go up as well, so less gas mileage.

  6. #5
    HurstGN is offline Cadillac Owners Enthusiast
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    Re: E85

    Not to mention the damage that can be done by the higher alcohol % in the fuel. Not everything in the fuel system is tolerant of the higher amount of alcohol. This is why we want to stop the E15 (15% alcohol) that the fed is pressing for. Nothing but bad going higher than what you currently get out of the pump.

  7. #6
    X E Ryder's Avatar
    X E Ryder is offline Cadillac Owners Member
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    Exclamation Re: E85 - Say NO to Alcohol

    Quote Originally Posted by HurstGN View Post
    Not to mention the damage that can be done by the higher alcohol % in the fuel. Not everything in the fuel system is tolerant of the higher amount of alcohol. This is why we want to stop the E15 (15% alcohol) that the fed is pressing for. Nothing but bad going higher than what you currently get out of the pump.
    Alcohol is absolutely HORRID for anything rubber - seals o-rings hose you name it.

  8. #7
    hungryhobo82 is offline Cadillac Owners Member
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    Re: E85

    The 2012 CTS Performance edition will NOT run e85. You will get 10 MPG and your Check engine light will come on if it does not blow up first. You must have a yellow gas cap to run e85. Read your manual before even thinking about it.

  9. #8
    BNRacing is offline Cadillac Owners Fanatic
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    Re: E85

    We can adjust your tune for E85- we've got a few 2012 Camaro 3.6 owners running it. All fuel systems that are in the newer GM cars are E85 capable but the engines are not without a different calibration, which is why it doesn't come flex-fuel ready.

  10. #9
    Michael_atDell's Avatar
    Michael_atDell is offline Cadillac Owners Fanatic
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    Quote Originally Posted by BNRacing
    We can adjust your tune for E85- we've got a few 2012 Camaro 3.6 owners running it. All fuel systems that are in the newer GM cars are E85 capable but the engines are not without a different calibration, which is why it doesn't come flex-fuel ready.
    Right, you've confirmed that for me before. My question is what is the maximum ratio of E85 to gasoline? For example, can I run half E85 and half gas without needing to alter my tune?

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