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Thread: command vs actual a/f

  1. #1
    Lifetime Member minytrker's Avatar
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    Default command vs actual a/f

    It seems latley a couple cars the command a/f vs actual were off just a little. I also have 12.5 set in PE vs RPM and the cars would still lean out to 13.1-13.5 at 5,000rpm or so, which is to lean for me. This is in SD doing auto tuning.
    99 Z28 Camaro|LS1 Heads & cam Tuned by LSX Power Tuning
    2003 CC Duramax Dually|19.5 w/245/70/19.5|Tuned by LSX Power Tuning|5in exhaust
    2009 G8 GT Vararam CAI|Tuned by LSX Power Tuning|GXP Mufflers|Custom System
    2006 CTS-V K&N CAI|OBX Headers|Cammed LS3|Tuned by LSX Power Tuning|

  2. #2
    EFILive Reseller ringram's Avatar
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    Check to see if IAT makes a difference. You might want to look at OS3 which allows you to adjust ve for iat changes. Most of us run this and find over 1% increase in ve is required per 10deg C of IAT. That might be your culprit.
    Get EFILive in europe (http://www.efilive.eu).
    2007 Escalade ESV L92 6.2L VVT.
    2014 VF SV LS3 Maloo.

  3. #3
    Lifetime Member SSpdDmon's Avatar
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    Quote Originally Posted by minytrker
    It seems latley a couple cars the command a/f vs actual were off just a little. I also have 12.5 set in PE vs RPM and the cars would still lean out to 13.1-13.5 at 5,000rpm or so, which is to lean for me. This is in SD doing auto tuning.
    Are you sure the MAF is disabled? Unplug it and then make a run...

  4. #4
    Lifetime Member minytrker's Avatar
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    Quote Originally Posted by SSpdDmon
    Are you sure the MAF is disabled? Unplug it and then make a run...
    Its unplugged.
    99 Z28 Camaro|LS1 Heads & cam Tuned by LSX Power Tuning
    2003 CC Duramax Dually|19.5 w/245/70/19.5|Tuned by LSX Power Tuning|5in exhaust
    2009 G8 GT Vararam CAI|Tuned by LSX Power Tuning|GXP Mufflers|Custom System
    2006 CTS-V K&N CAI|OBX Headers|Cammed LS3|Tuned by LSX Power Tuning|

  5. #5
    Lifetime Member SinisterSS's Avatar
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    What BEN values do you have in the range where it's leaning out?
    2009 Z06 LS7 / 2008 Sierra Denali AWD L92 6L80E
    Flashing control modules since 2001. 8-)
    Who needs a MAP sensor on a supercharged LS6 anyway.


  6. #6
    Lifetime Member minytrker's Avatar
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    Quote Originally Posted by SinisterSS
    What BEN values do you have in the range where it's leaning out?
    1.05
    1.01
    1.01
    1.05
    1.07
    1.05

    commanding 12.53
    99 Z28 Camaro|LS1 Heads & cam Tuned by LSX Power Tuning
    2003 CC Duramax Dually|19.5 w/245/70/19.5|Tuned by LSX Power Tuning|5in exhaust
    2009 G8 GT Vararam CAI|Tuned by LSX Power Tuning|GXP Mufflers|Custom System
    2006 CTS-V K&N CAI|OBX Headers|Cammed LS3|Tuned by LSX Power Tuning|

  7. #7
    Lifetime Member SinisterSS's Avatar
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    Those values are saying the current fueling as commanded by the VE table in those cells are lean and need between 1 and 7% more fuel.

    Multiply the corresponding VE cell values by the corresponding BEN factors and collect another WOT run of data. It's pretty easy to get WOT BEN values of 1.00 across the entire WOT range after a couple of iterations which will give that perfect actual vs. commanded result.
    2009 Z06 LS7 / 2008 Sierra Denali AWD L92 6L80E
    Flashing control modules since 2001. 8-)
    Who needs a MAP sensor on a supercharged LS6 anyway.


  8. #8
    Lifetime Member minytrker's Avatar
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    So I just need to keep doing that more, thats what I have been doing.
    99 Z28 Camaro|LS1 Heads & cam Tuned by LSX Power Tuning
    2003 CC Duramax Dually|19.5 w/245/70/19.5|Tuned by LSX Power Tuning|5in exhaust
    2009 G8 GT Vararam CAI|Tuned by LSX Power Tuning|GXP Mufflers|Custom System
    2006 CTS-V K&N CAI|OBX Headers|Cammed LS3|Tuned by LSX Power Tuning|

  9. #9
    Lifetime Member SinisterSS's Avatar
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    Yes, keep rinsing and repeating. Have the BEN values always been above 1.0 and it keeps wanting more fuel in that range?

    Or are the numbers sometimes above 1.0 and then the next time, below 1.0 in a few WOT cells? If so, the "shape" of the VE off a little from cell to cell. The WOT cells in the VE should be pretty smooth from one cell to the next - no jagged mountain peaks which is where the "shape" comes in. If you've got jagged peaks, try hand smoothing them out and collect some more data.
    2009 Z06 LS7 / 2008 Sierra Denali AWD L92 6L80E
    Flashing control modules since 2001. 8-)
    Who needs a MAP sensor on a supercharged LS6 anyway.


  10. #10
    Lifetime Member minytrker's Avatar
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    It has been going up and down.
    99 Z28 Camaro|LS1 Heads & cam Tuned by LSX Power Tuning
    2003 CC Duramax Dually|19.5 w/245/70/19.5|Tuned by LSX Power Tuning|5in exhaust
    2009 G8 GT Vararam CAI|Tuned by LSX Power Tuning|GXP Mufflers|Custom System
    2006 CTS-V K&N CAI|OBX Headers|Cammed LS3|Tuned by LSX Power Tuning|

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