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Thread: Lean decel on Bank 1 only

  1. #1
    Lifetime Member samh_08's Avatar
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    Default Lean decel on Bank 1 only

    Hey guys, I just got my swap project on the road and the tune in bearable except for coasting to a stop. I have noticed that bank 1 pegs to +25% LTFT while bank 2 reads normal. At first I figured I had a misfire or exhaust leak, but I only does this IN GEAR. It idles very nicely in park or neutral and the fuel trims are the same on both sides. Any ideas?

    Car info..
    Heads/Cam 2005 LQ4 (bumped compression to ~10.5:1)
    Currently running a speed density tune
    Need any other info?

    I attached my lasted scan and tune, forgive me noobness
    Attached Files Attached Files

  2. #2
    Lifetime Member mr.prick's Avatar
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    From my experience,
    there can be a bit of a difference in LTFTs between bank1 and bank2.
    Your LTFTs are highly negative on both sides,
    You can use this PID for LTFT adjustment to the VE table.

    *CLC-00-010
    factor 0.0 1.4 0.2 "({SAE.LONGFT1}+{SAE.LONGFT2})/2/100+1"
    ------------------------------------------------------------------------------------
    CALC.LTFTBEN F010 CLC-00-010 factor O2-Wide "LTFT BEN"
    512k RoadRunner Firmware 12.14R
    FlashScan V2 Bootblock V2.07.04 Firmware V2.07.22 EFILive V7.5.7 (Build 191) V8.2.1 (Build 181)
    LC-1 WBO2

    _________________________________________________

  3. #3
    Lifetime Member samh_08's Avatar
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    Did you happen to see what I meant about bank 1 going +25%?

    I know my trims are negative, but I would rather have them rich now for safely sake.

    Let me know your thoughts, Thanks.

  4. #4
    Lifetime Member mr.prick's Avatar
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    How long ago did you reflash or reset the fuel trims?
    They will be wacky for a while after.
    512k RoadRunner Firmware 12.14R
    FlashScan V2 Bootblock V2.07.04 Firmware V2.07.22 EFILive V7.5.7 (Build 191) V8.2.1 (Build 181)
    LC-1 WBO2

    _________________________________________________

  5. #5
    Lifetime Member samh_08's Avatar
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    This log was after about a half hour of driving. Shouldn't they have settled pretty close by then? What is the general rule of thumb for the trims to settle in?

    Either way it seems as though something else is up. It locked into them trim values every time I decelerated as if those where the correct settled in trims.

  6. #6
    Lifetime Member mr.prick's Avatar
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    The PID I posted works very good on the VE table and the MAF at getting
    LTFTs inline.

    You either need adjustment, new O2's or have a leak.
    I had LTFTs that high once,
    it was because the shop that tuned my car made no adjustments to VE or MAF.
    Because of this, I've been an EFILive owner since 2006.
    512k RoadRunner Firmware 12.14R
    FlashScan V2 Bootblock V2.07.04 Firmware V2.07.22 EFILive V7.5.7 (Build 191) V8.2.1 (Build 181)
    LC-1 WBO2

    _________________________________________________

  7. #7
    Lifetime Member samh_08's Avatar
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    K well I will assume the worst for now. Would it be wise of me to install my wideband on the side that is not giving me these numbers for when I do AutoVE?

    I assume the PID you supplied is a kind of doing the same thing AutoVE does?

  8. #8
    Lifetime Member mr.prick's Avatar
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    Quote Originally Posted by samh_08 View Post
    K well I will assume the worst for now. Would it be wise of me to install my wideband on the side that is not giving me these numbers for when I do AutoVE?

    I assume the PID you supplied is a kind of doing the same thing AutoVE does?
    Some would say to put it on the "leaner" side".

    Yes,
    you can use the LTFT BEN for non PE mode tuning,
    use regular BEN for WOT.
    512k RoadRunner Firmware 12.14R
    FlashScan V2 Bootblock V2.07.04 Firmware V2.07.22 EFILive V7.5.7 (Build 191) V8.2.1 (Build 181)
    LC-1 WBO2

    _________________________________________________

  9. #9
    Lifetime Member samh_08's Avatar
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    Quote Originally Posted by mr.prick View Post
    Some would say to put it on the "leaner" side".
    So in my case, being I am having odd readings on bank 1, would it make more sense for me to put it on bank 2 for now?

  10. #10
    Lifetime Member mr.prick's Avatar
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    IIRC bank1 is generally the leaner.
    You can configure some WBO2`s to simulate a NBO2.
    512k RoadRunner Firmware 12.14R
    FlashScan V2 Bootblock V2.07.04 Firmware V2.07.22 EFILive V7.5.7 (Build 191) V8.2.1 (Build 181)
    LC-1 WBO2

    _________________________________________________

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