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Thread: Transient fueling adjustments

  1. #1
    Moderator Turbo Mopar Staff Force Fed Mopar's Avatar
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    Transient fueling adjustments

    How does the Decel Leanout work? I have a problem with it cutting the fuel back way to much when easing off the gas, usually in normal (to me) driving. What happens is I take off, it goes into a few psi of boost (1-5 psi normally), right after it does I need to start lifting off to switch gears. When I do and it drops into the 0-10" of vacuum range, it goes way lean and causes a bad stumble/misfire. Worst cases it's going to 17+ AFR and cuts out hard cause it's running out of fuel essentially. Best case it's a slight hiccup. It's usually worst around 3k rpm, give or take a few hundred.

    I've tried adjusting for it by adding fuel in that range in the PartThrottle and\or FuelBaseline tables, I've got it better but never seem to eliminate it. Tried scaling for 52, 55 and 58 lb injectors. So I'm looking at the Decel Leanout Factor as the possible culprit? Should I lower this?

    T-SMEC V19.6-1, B151 cal scaled for 58# injectors (works best for me in the rest of the fueling), 3-bar, A131 timing tables.
    Rob M.
    '89 Turbo GTC

    2.5 TIII stroker, 568 w/ OBX and 3.77 FD

  2. #2
    Moderator Turbo Mopar Staff Force Fed Mopar's Avatar
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    Re: Transient fueling adjustments

    Do not lower the DecelLeanoutFactor, it will make it worse. Ask me how I know lol. Decided to scale it down 25% and try it. It made it waaay worse, literally pegged it lean on any slight decrease in map value. I set it back to stock, and am going to scale it up instead by 5-10% and see how it does.
    Rob M.
    '89 Turbo GTC

    2.5 TIII stroker, 568 w/ OBX and 3.77 FD

  3. #3
    Hybrid booster
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    Re: Transient fueling adjustments

    I'd be interested on how to turn it off completely.

    Which DecelLeanoutFactor are you changing? Map LO or TPS LO ?

  4. #4
    Moderator Turbo Mopar Staff Force Fed Mopar's Avatar
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    Re: Transient fueling adjustments

    The MapLo function.
    Rob M.
    '89 Turbo GTC

    2.5 TIII stroker, 568 w/ OBX and 3.77 FD

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