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Thread: What AFR do you want to command at Idle?

  1. #1
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    Default What AFR do you want to command at Idle?

    Right now it's commanding in the 12's and I need to change that and not sure what to change it too, or where exactly to change it, any help would be great, cuz it keeps fouling the plugs!
    - Devon

    White '99 Z28

    9.09 @ 150

  2. #2
    Lifetime Member TAQuickness's Avatar
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    I command about 13.5:1 at idle. I've heard of others going as lean at 16ish:1

    You will want to use the BIDI to adjust commanded fuel and spark to find the combo that yields the best vacuum for your application.


  3. #3
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    Just outta curiosity, which table are you refering to?

  4. #4
    Lifetime Member TAQuickness's Avatar
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    B3505 or B3647 in COS3 and COS5 (Open Loop Fuel tables)


  5. #5
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    I have yet to swap pcm's and try a cos5. damn 98's.

  6. #6
    Lifetime Member Doc's Avatar
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    RUTAN TA, don't be afraid to cross over to the dark side.

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