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Thread: AFR at cruise?

  1. #1
    Junior Member
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    Jan 2008
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    Default AFR at cruise?

    I have been watching my AFR since I recieve my serial cable TAQuickness and noticed that when cruising at 70mph in OD my afr is ~13.8-14.3. That seems to be a little rich and curious what I need to do to lean it out. New to tuning and just finished my first AutoVE of the truck. Truck is a 97 2dr yukon with a 383, marine intake, mild cam and 0411.

    Wes

  2. #2
    Lifetime Member
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    Apr 2008
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    Default

    first of all, you need to log the following:

    AFR vs RPM vs Map

    Timing

    ECT

    IAT

    Trims if you still use them
    Regards,

    Odd Boy

  3. #3
    Junior Member
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    Jan 2008
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    Default

    How do you log afr vs rpm vs map? Thanks

  4. #4
    Lifetime Member
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    Apr 2008
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    Default

    Can you connect the WB to efilive?
    Regards,

    Odd Boy

  5. #5
    Junior Member
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    Default

    yes

  6. #6
    Lifetime Member
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    Default

    Before I ever touched fuel I went through the ignition map and cleaned it up. Then I finally got off my ass and got autoVE working with a TAQuickness cable which was awesome. To date I've only done my original 2 rounds of autoVE but they each had a good 30 minutes of data and I hit every cell I wanted to enough times. Honestly, the second round did almost nothing, the first round pretty much got it right on 14.7:1 at that particular IAT. Now that it's cold, the truck hangs more around 14.0-14.2 at cruise which is still leaner than it was stock. Putsing around town in the summer time gets me 16.XX:1 AFR's which totally kills the performance, that's why I bought a 411 but I've been too busy with my other 2 projects to get on this one. Since you've got the 411, once you get the autoVE right just remember the IAT it was right at because you might have to screw with IAT correction factors or that dreaded IAT/ECT blend table.
    1998 GMC Sierra K1500 5.7/4L80E, longtubes, 411 w/COS 5, marine cam/intake, Whipple. 91 octane at 6000'.
    1997 GMC Sierra K3500 7.4/4L80E, 411 w/COS 3, Whipple, small cam.
    2004 Corvette Z06 with longtubes.

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