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Thread: Ethanol Content Fuel Flow Multiplier

  1. #1

    Default Ethanol Content Fuel Flow Multiplier

    I have an HP ECU and all inputs are being used. I don’t plan on installing a flex fuel sensor in the near future. I measure the ethanol content of the fuel in the tank regularly. What would be the easiest/most sensible way for me to quickly make changes to the Fuel Flow Multiplier in the software based on ethanol content? Thank you.

  2. #2


    When Closed Loop is enabled and the ECU is trying to achieve the Target A/F Ratio and a Fuel Flow multiplier is in use, what occurs? Does the ECU apply the multiplier to the amount of fuel that would normally be required to achieve the Target A/F Ratio? Thank you.

  3. #3


    The multiplier is applied immediately and Closed Loop (& Learn) continues to try and reach the Target AFR. If you didn't add anything with the fuel multiplier the Target would still be achieved, but the Closed Loop Correction would be high (engine running). And remember that Closed Loop has no affect on startup, and warm up, and AE fuel, whereas the multiplier does.

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