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Thread: Commanded Afr changing during log

  1. 03-25-2012 #1
    Tazmo65
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    Commanded Afr changing during log

    My tune is a work in progress. Steep learning curve. My question is should the commanded afr value change by itself while logging? It seems like a moving target to try and hit. The only way i was able to get it hold steady was to force 14.7 using the vcm controls.
    Last edited by Tazmo65; 03-26-2012 at 05:32 AM.
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  2. 03-25-2012 #2
    2xLS1
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    Looks like you are running in open loop and the commanded A/F is changing with the change in MAP value like in the Open Loop A/F vs Coolant Temp vs MAP table.
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  3. 03-26-2012 #3
    Tazmo65
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    I am in fact forcing open using vcm controls. Is it normal for the commanded afr to move around like that in those conditions?
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  4. 03-28-2012 #4
    NBMLS2TA
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    Yes it is normal unless you set that table "Open Loop F/A vs. Coolant Temp vs. MAP to all 1.00s. This is a modifier that acts on fueling during OL operation. IF you set it to all 1.00s it will be commanding whatever you set your stoich value at.
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