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Thread: 16197427 $OD, Help with AE duration / decay rate... lean stumble after AE ends

  1. #1
    Carb and Points!
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    16197427 $OD, Help with AE duration / decay rate... lean stumble after AE ends

    Working on a '94 tbi chevy 355 with the 16197427 $OD computer and 4L60E transmission.

    I am trying to dial in my accel enrich circuit and I am wondering if anyone knows what setting(s) will allow the AE to run longer. I have played with the "Maximum time for additional AE" but it has had no effect.

    My AE TPS is on point, then my AE MAP kicks in all is well but then it ends too quickly and the truck goes lean again for a second or two before it recovers. So I am thinking their must be something that can adjust the decay rate or the duration of the AE, but so far I have not figured it out. Any help would be greatly appreciated.

  2. #2
    Super Moderator dave w's Avatar
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    Have you tried adjusting parameters in the Acceleration Enrichment Tables? See attached screen shot.

    dave w
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  3. #3
    Carb and Points!
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    I have played with:

    AE vs MAP diff
    AE vs TPS diff
    And some of the multipliers

    Tried some settings from the big block cals etc...

    My wideband shows the AE doing what it needs to do in the beginning, however it ends before the intake volume stabilizes again. Thats why I was wondering if there is a duration setting. Currently my AE vs MAP diff is 8 times larger than stock.

  4. #4
    Super Moderator dave w's Avatar
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    Quote Originally Posted by camaro354 View Post
    I have played with:

    AE vs MAP diff
    AE vs TPS diff
    And some of the multipliers

    Tried some settings from the big block cals etc...

    My wideband shows the AE doing what it needs to do in the beginning, however it ends before the intake volume stabilizes again. Thats why I was wondering if there is a duration setting. Currently my AE vs MAP diff is 8 times larger than stock.
    I think AE acts more like the "pump shot" on a carburetor, and "power enrichment" acts more like the secondary's of a 4 barrel carburetor opening up. I wonder what would happen if the TPS % for PE was a lower %?

    I'm also wonder what the PE AFR ratios are doing?

    dave w
    Attached Images Attached Images

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