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Thread: very big difference in AFR commanded vs Actual in wot

  1. 11-25-2023 #1
    Paoloz
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    very big difference in AFR commanded vs Actual in wot

    I really don't understand

    my swapped LZ4 with E38 has a big difference in wot between AFR commanded vs acutal read with a wide band sond......

    should be 12 and is 14 or even leaner.......

    engine is swapped and I bought the car in this configuration (no speed sensor, custom exhaust.....)

    all A/F ratio is generally lean but behave strange

    thanks who can help meafr comm vs atcual.JPG
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    Paolo
    Grifun mid engined V6 3500 LZ4 manual trans
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  2. 11-25-2023 #2
    5FDP
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    I'd manually verify that you have good fuel pressure first. If that checks out then I'd honestly probably just add 10-15% to the MAF curve in the desired Hz range. If the actual fueling starts to match the commanded, then you know where you need to work on it.
    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.
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  3. 11-26-2023 #3
    Paoloz
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    I agree this is the right way to proceed !
    Thanks

    Paolo
    Paolo
    Grifun mid engined V6 3500 LZ4 manual trans
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