Flex Fuel Tune ALCH_PCT% & ALCH_LEARN FLAG refresh

Discussion in 'V8 5.0L Engine / Mods: Bolt-ons, Exhaust, Tuning' started by WhiplashGo, Aug 2, 2019.

  1. WhiplashGo

    WhiplashGo Well-Known Member

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    I recently got my Lund flex fuel tune. Previously has a 93 tune. Loaded flex fuel tune & filled up with e85, only had 2 miles of 93 left in tank. Idled for 10 plus minutes & after ALCH_PCT% was @ 35% drove it gently till ALCH_LEARN FLAG locked in & changed from 0 to 1. It got to 65% & locked in. I know E85 I fillled car with was 80% because I had a tester & tested it during fill up. Question is there anyway to reset or refresh so Ngauge learns correct % of E85? Also now that I need to fill up again & will be getting more E85 how do you get Ngauge to relearn E85%?
     
  2. gixxersixxerman

    gixxersixxerman Well-Known Member

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    It “relearn” after 4 gallons are added at least. Also don’t worry about your first fill up. I’ve been down to 0 miles filled up and it not be close to what it was tested at. Watch your knock correction, short and long term trims, get on Lund’s FB page and Alex “YOLO” just did a video on this.
     
  3. ChiTownStang26

    ChiTownStang26 Well-Known Member

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    I believe if you get your tank down to a quarter tank then fill up it will initiate another alch relearn. Worked for me in the past.
     
  4. Zelek

    Zelek Well-Known Member

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    There was probably still some 93 in the fuel lines. Try reflashing the E85R tune on, then flash the Flex tune on again and it will do another relearn.

    I just recently went from E85 to 93 and I had about 10 miles left till empty when I swapped. 85.9% was the locked in value on E85, 22.5% after I filled with 93 octane and it locked in.

    Lund states that the Flex tune is a convenience tune. It's not really meant for full time use although people are using it for that. Once you empty that tank and go E85 again, I'd just flash the E85R tune at that point. It's good as long as your Alch % stays above 70%. Find a consistent E85 station and you don't really worry about testing the content. I haven't tested once since I've been running E85 and getting it from the same station every time and I've been good.
     
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  5. OP
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    WhiplashGo

    WhiplashGo Well-Known Member

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    So fill with @ least 4 gallons of e85 or flash tune. Thanks, anybody else.
     
  6. Diocletian

    Diocletian Well-Known Member

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    Basically it. You can also disconnect the battery for at least 30 min(1 hour to be safe) and that will also clear KAM data and do the same thing
     
  7. Zrussian13

    Zrussian13 Well-Known Member

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    Kam reset and it should relearn the fuel. I've done that in the past when I knew my car didn't learn the correct percentage.
     
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  8. Diocletian

    Diocletian Well-Known Member

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    Looks like he has a Lund Ngauge uner, which does not have a KAM reset option, stupidly. Switching back and forth between tunes or a battery disconnect are his only options
     
  9. Zrussian13

    Zrussian13 Well-Known Member

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    Good point I didn't catch that and I'm using a sct bdx.
     
  10. Shocker

    Shocker Well-Known Member

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    From what I understand, the Alch% isn’t accurate on the Ngauge.
     
  11. OP
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    WhiplashGo

    WhiplashGo Well-Known Member

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    #11 WhiplashGo, Aug 3, 2019
    Last edited: Aug 3, 2019
    Was told to let car idle & do neutral rev holds for the ethanol% to start learning. What are neutral rev holds? Is it only for manual cars?
     
  12. TRPCANA

    TRPCANA Well-Known Member

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    Like others said OP, i swapped to the lund flex tune a few weeks ago. Had some 93 in the tank, Alch only went to 50 something percent. Just drove it around for awhile, then when it had the space i filled up with at least 4 gallons. 4 gallons triggers the relearn process, bear in mind the relearn can take time. Eventually after a few tanks i settled around 85-86 alch on average. In the mean time you are fine however, the flex tune adapts based on the ratio of 93 or e85 it sees, once locked in you are fine just drive the car, and with E85 it wont be long before you will need to get gas again anyway lol.
     
  13. Zelek

    Zelek Well-Known Member

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    Sit in neutral and rev around 2-3k steady till alch % hits about 40% then go drive. If you can keep it at 3k rpm and steady throttle, the learn process goes really smoothly.
     
  14. OP
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    WhiplashGo

    WhiplashGo Well-Known Member

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    Is this only for manuals or is it ok to do in an auto. My car is auto.
     
  15. Diocletian

    Diocletian Well-Known Member

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    Yes, the procedure is the same for an auto. I have an A10 with a Lund nGauge tune as well
     
  16. OP
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    WhiplashGo

    WhiplashGo Well-Known Member

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    OK, thanks for the info.
     
  17. AZ18yote

    AZ18yote Well-Known Member

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    Nguage doesn't have the KAM reset option that the SCT does? Didn't realize that just assumed it had most of the same basic functions. What about crank relearn does it at least have that?
     
  18. gixxersixxerman

    gixxersixxerman Well-Known Member

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    Yeah the Ngauge has crank relearn. Used it when the Mantic was installed. Not sure if I needed to but was told by some to do it others not to worry about it.
     
  19. Diocletian

    Diocletian Well-Known Member

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    It has a crank relearn yes
     
  20. Bullitt78

    Bullitt78 Active Member

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    Check this and a couple other of his E85/Flex Videos. The reset starts when you go below a quarter of a tank supposedly.

     
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