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Thread: E85 Tuning

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    E85 Tuning

    Do the pro tuners here that tune for E85 (E70 etc) just use Lambda values rather than calc using a gas AFR ?
    2005 Porsche 996 TTS RWD - Eurodyne 60-130 in 6.50s
    2015 Audi A3 2.0 TFSI - Eurodyne 0 - 100 in 10.67s
    2015 McLaren 650S (RHD) - UK - 1/3rd owner yet to drive


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    All o2 sensors read the same lambda. Everything is a conversion from that. So you can tune to gasoline afr values with e85. The afr is technically different but the actual voltage is the same. I guess the easiest way to understand it is that it just takes more fuel to reach the same value. Whether it is afr or lambda. But most people that tune or work in the field use lambda.
    I have found that cars make a bit more power at richer values on e85 than on gas.

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    Click here to enlarge Originally Posted by whipplem104 Click here to enlarge
    All o2 sensors read the same lambda. Everything is a conversion from that. So you can tune to gasoline afr values with e85. The afr is technically different but the actual voltage is the same. I guess the easiest way to understand it is that it just takes more fuel to reach the same value. Whether it is afr or lambda. But most people that tune or work in the field use lambda.
    I have found that cars make a bit more power at richer values on e85 than on gas.
    Thanks A+

    Click here to enlarge
    2005 Porsche 996 TTS RWD - Eurodyne 60-130 in 6.50s
    2015 Audi A3 2.0 TFSI - Eurodyne 0 - 100 in 10.67s
    2015 McLaren 650S (RHD) - UK - 1/3rd owner yet to drive


    Click here to enlarge



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