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Thread: Target AFR with addition of Port Injection ???

  1. #1
    Tuner in Training
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    Smile Target AFR with addition of Port Injection ???

    I been targeting 0.84 lambda on my SCed DI LT1 engine. I recently added port injection. If I was estimating, i would say 15% of my fueling at WOT comes from port injection.

    Question now is, what should I be targeting ? Right now it sits around 0.82... Anyone have any opinions ?

  2. #2
    Senior Tuner Ben Charles's Avatar
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    Hit the same fuel but Target less... this will keep Tq model correct and if automatic trans, much happier since will be reporting correct Tq and not several hundred Ftlbs less then it should

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  3. #3
    Senior Tuner Ben Charles's Avatar
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    So target near stoich in the mid to low boost region of PE

    Email Tunes, [email protected]
    96 TA Blown/Stroked, 4L80E/Fab 9
    15 C7 A8 H/C 2.3 Blower/PI
    14 Gen 5 Viper
    Custom Mid Engine chassis, AKA GalBen C

  4. #4
    Tuner in Training
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    thanks Ben, i didn't see this message in time for my track day.

    I ended setting my PE table to command 0.84 after 3800ish rpm little leaner before that.. bumped my MAF down a little just to keep DI injectors under 5.5ms.. (wasn't sure how else to do it)

    Ended up setting my Term. X to target learn 12.0AFR after 5-6psi ... maybe it should be 11.85 ?

    kinda sounds like what you were suggesting ???

    car is A8