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Thread: not getting commanded afr

  1. #1
    Potential Tuner fbamj's Avatar
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    Dec 2010
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    Dumas Tx
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    not getting commanded afr

    I can not figure out why I cannot get the fuel where I want it under wot? I'm using an LM1 tied to hp tuners. LS1 with 36 lb. injectors mild cam, headers, I should have it very rich with the tune in it. See if anyone can find what I'm missing. Thanks Mike
    Attached Files Attached Files
    1999 Camaro 5.7 cnc heads, .608/.608 cam, 3700 conv., 4.10 gear
    1968 C-10 chevy short wide 5.7 78mm turbo 3600 conv 3.70 gear
    1978 chevy luv 6.0 cnc headed .568/.590 cam 3200 conv 3.90 gear all smiles

  2. #2
    Tuning Addict 5FDP's Avatar
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    May 2012
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    Rogers, MN
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    13,565
    What is the wideband saying compared to your PE setting?

    Set up your PE to what you want to see at WOT, so like 12.5. Then you must tune the VE and MAF tables.

    Your VE is choppy is some spots and the MAF table is not completely smooth, couple dips.

    After that you would only add the the VE or MAF to increase or reduce fuel. You don't screw with the PE table to get more fuel, thats not the right way to do 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.

  3. #3
    Potential Tuner fbamj's Avatar
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    Dumas Tx
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    haven't smoothed either of them yet after setting them today. This is the way I have always corrected wot afr. I'm using maf not doing sd tune. That was only time i used ve to correct fuel.
    1999 Camaro 5.7 cnc heads, .608/.608 cam, 3700 conv., 4.10 gear
    1968 C-10 chevy short wide 5.7 78mm turbo 3600 conv 3.70 gear
    1978 chevy luv 6.0 cnc headed .568/.590 cam 3200 conv 3.90 gear all smiles

  4. #4
    Tuner POWERZONE's Avatar
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    Jul 2014
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    HOUSTON,TX
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    191
    It is a good idea to log AFR commanded and AFR error so you can see on your logs. It will make your tuning process easier.

    It is a good practice to use AFR error as well for fueling if you are using a wideband.
    Last edited by POWERZONE; 10-25-2015 at 09:33 AM.
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