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Thread: Commanded air fuel value changes when shifting from 3-4

  1. 06-27-2015 #1
    tunes
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    Commanded air fuel value changes when shifting from 3-4

    Hey guys,

    I've been tuning/logging my newly cammed ls6 04 cts-v, car runs great, but I have been seeing something odd in my logs.....My commanded air fuels are set to 1.13 up to 4krpm, then 1.167 to redline, the logs show this as true up until I shift into 4th gear. When I shift to 4th gear, the commanded air fuels dip into the high 11s (LTFTs and STFTs are at 0%, no correction due to iat or ect)....is there some sort of gear based trim that I am not seeing?

    3rd gear:



    4th gear:



    any help is greatly appreciated!
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  2. 06-27-2015 #2
    Stuffs
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    post your tune
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  3. 06-27-2015 #3
    WS6FirebirdTA00
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    Plot your AFR in the charts too.

    How about COT?
    Sulski Performance Tuning
    2000 WS6 M6 - LS6 (long block, refreshed top end), 10.8:1 CR, 90 mm ported FAST, Exo-Skel, 227/232 cam, QTP HVMC, EWP, GMMG, 9" w/4.11s
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  4. 07-09-2015 #4
    tunes
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    Sorry I've been away, tune should be added to this post...


    One other thing I noticed while tuning with the LTFT disabled was that my commanded air fuels sometimes went to 16:1....I noticed the MAP value was typically below that of idle, so assuming i was decelerating...... will this happen under DFCO?
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  5. 07-10-2015 #5
    MikeOD
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    It's cat overtemp. Disable it. It's allowed to command 1.25 EQ ratio...which is exactly what it's commanding.
    2010 Camaro SS M6. Stock Bottom End, Heads/Cam/Intake/Headers/Exhaust.
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  6. 07-10-2015 #6
    tunes
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    Thank you very much!

    I've tuned lots of high hp imports on hondata, aem, etc, but I'm very new to this GM software
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