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Thread: Raptor Flex fuel

  1. #1
    Senior Tuner Higgs Boson's Avatar
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    Raptor Flex fuel

    Glad to see we have ecoboost flex fuel available.....I have been messing with it for a couple days but without a PID to monitor E% I am just screwing around.

    How are you guys monitoring your ethanol percentage (in the scanner)?
    Does anyone have a set/good E tune for EB?

    I have checked out one or two repository files for Flex but they are 5.0 F-150, not EB and not quite the same....

  2. #2
    Potential Tuner
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    I am interested in this topic as well as I plan to tune mine to run flex. Since this is inferred alcohol content, wouldn't the PCM adjust the commanded AFR to match what the O2 sensors are telling it? By monitoring commanded AFR at cruise or idle (Lambda=1) could you back out the alcohol percentage?

  3. #3
    Senior Tuner Higgs Boson's Avatar
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    yes the inferred alcohol pid was not in the scanner when I made this thread, now it is.....or else I may have overlooked it, but I don't think I did....

    let me know if you have any questions about setup, mine is running great on E now.

  4. #4
    I?ve got one running a flex tune now. We are currently doing HPFP, injectors, lift pump, and BAP as we speak. We limited out our fuel sustem quite easily going to E. Hope this alleviates it.

  5. #5
    Tuner in Training
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    There's a place to enter the stoichiometric AFR, which stock on my MKS was set about 14.2, which is about correct for E10. When running ethanol higher blends, do you change this value? Does changing this value effect the LTFTs?
    2013 Lincoln MKS Ecoboost
    2002 Regal GS (3800 Supercharged V6)
    1996 Dodge RAM 2500 Cummins Turbo Diesel
    1982 Buick Grand National
    1965 Hemi Barracuda (43 jr)

  6. #6
    Tuner in Training fingertuning's Avatar
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    Quote Originally Posted by b4black View Post
    There's a place to enter the stoichiometric AFR, which stock on my MKS was set about 14.2, which is about correct for E10. When running ethanol higher blends, do you change this value? Does changing this value effect the LTFTs?
    That is typically how you account for a different ethanol blend if you're running it full time, for my Focus ST I often ran a 40% ethanol blend so I would set that stoich value to a lambda of ~0.846 (~12.39 afr), the base fueling is now targeting that value for stoich. LTFT and STFT both are correcting the same way they do on the stock tune.

    Now I haven't had a chance to dive into a Flex Fuel vehicle so I'm not 100% sure how you setup a vehicle with that.

    Here's a log when I was running an E50 mix with STFT and LTFT logged https://datazap.me/u/tannermidd/e50-...17&zoom=43-137
    Last edited by fingertuning; 02-13-2019 at 04:33 PM.

  7. #7
    Working on Flex for a Raptor as well. So is the system 100% "virtual sensor" or do you need to add in a physical sensor?

  8. #8
    Senior Tuner Higgs Boson's Avatar
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    Quote Originally Posted by Terry Burger View Post
    Working on Flex for a Raptor as well. So is the system 100% "virtual sensor" or do you need to add in a physical sensor?
    no sensor, it is inferred

    the ford has widebands, as I am sure you know, so it works pretty well.

  9. #9
    Quote Originally Posted by Higgs Boson View Post
    no sensor, it is inferred

    the ford has widebands, as I am sure you know, so it works pretty well.
    Awesome, even easier!

    Do you have a sample tuned file to share so I can see what which flex tables need to be adjusted to get a basic setup up and working?

    I can see the WOT vs. flex lambda target table mapping. Seems easy enough.

    Not quite sure how the ignition mapping works. Since there is just one set of borderline tables I'm presuming there is another table that adds timing by RPM/load as a function of E85 mixture?

    And then of course some sort of way to adjust load/torque targets as a function of E85 mixture.