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Thread: No MAF how to tune Air/Fuel Ratio

  1. #1
    Tuner in Training
    Join Date
    Jul 2007
    Posts
    12

    No MAF how to tune Air/Fuel Ratio

    I have a 01 grand am RSM kit, if there is no MAF how do I adjust and tune the Air fuel ratio. Where do I go to change the values, and what values mean what. Is it lower number the richer????

  2. #2
    Advanced Tuner xonelith's Avatar
    Join Date
    Oct 2004
    Location
    Whitby, Ontario, CANADA
    Posts
    408
    You will need to tune your afr's using your LTFT's and STFT's. Your narrowband sensor is only accurate at stoich, so the adjustments will need to be small.

    The adjustments will be made to your VE table (i think others refer to this as SD mode?) for closed loop. Look around for a VE tuning guide (there's one on my website).

    For PE, you'll be using the adders under the powerenrichment tab. I'm not sure how others tune for boost here without a MAF.

    Since you have heavily modified your GA (ie adding boost), you NEED a wideband controller!!!!! It will make your tuning much easier and much more accurate (and probably avoid an unexpected POP).
    Last edited by xonelith; 07-06-2007 at 04:40 PM.
    All Motor 2001 GA GT1