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Thread: PE mode how much variation is acceptable?

  1. #1
    Tuner in Training
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    Apr 2019
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    PE mode how much variation is acceptable?

    Hi guys,

    Im in the proces of WOT PE mode VE tuning of my 2008 zo6 ls7

    In PE mode the commanded afr is 12.71.

    I don't think it is possible to tune in such a matter that the actualy AFR is exact equal as the commanded AFR.

    When I do a pull the actual AFR is moving around 12.71 with a tolerance off 12,6 to 12,8.

    My question is, what do you experience tuners think is a tolerable margin?

    Thanks a lot

  2. #2
    Tuning Addict 5FDP's Avatar
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    May 2012
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    Rogers, MN
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    Plus or minus .1 is just fine by me.

    Like you said it's impossible to be exact, so getting it close is good enough and all you can do. If I was using an AFR error or lambda error, getting within like 1-3% is where I'm looking.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.

  3. #3
    Tuner in Training
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    Apr 2019
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    I also assumed it is fine. But it is allways nice to to get it confirmt.

    I see you are from Rogers MN. Im from the Netherlands and visit Minneapolis last week, drove near your house to do some shopping in Albertville.

    Small world.

  4. #4
    Tuning Addict 5FDP's Avatar
    Join Date
    May 2012
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    Rogers, MN
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    That's a long way to go shopping at the outlet mall lol.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.