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Thread: $0D AE temperature difference tuning

  1. #1
    Fuel Injected! JeepsAndGuns's Avatar
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    $0D AE temperature difference tuning

    OK, following my last thread, I am now having a problem with AE. When I changed my base timing to 0*, it helped a lot of things, but my AE suddenly became too little. It would go lean if I hit the gas. A little tuning/emulation got it back to where it should. However, when I adjusted it, the engine was already warmed up. Well yesterday I did a cold start and when the engine is cold and warming up, AE is flooding it. I'm talking like down to 10 to 1 AFR and boggs the engine. Once it gets warmed up, its fine. So apparently I need to adjust some type of a temperature compensation for AE, however I'm not sure what to adjust and by how much. I have found a few parameters, but the value is "factor" and I have no idea what that means, which way to adjust it and by how much. I figured I would ask before I start fooling around with them, as I only get one chance a day to try it. Just a reminder, I have a MAT installed.

    I have found the following 3 parameters that I think may have something to do with it.
    "AE correction factor Vs. temperature" (0x4B67)
    "TPS difference AE correction factor Vs. MAT" (0x4B78)
    "MAP difference AE correction factor Vs. temperature" (0x4B89)

    Then possiably this one too:
    "TPS difference AE coeffcient Vs. temperature" (0x4B5A)

    So what is, or does "factor" mean, whats the best way to adjust it, and which way do I need to adjust it to take some AE out when cold?
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  2. #2
    RIP EagleMark's Avatar
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    May be a couple things if you have it dialed in warmed up.

    "AE correction factor Vs. temperature" As you can see when engine is warm the factor is 1.0 meaning no adjustment, colder is multiplying. So can reduce here.

    Another may be if it's still open loop? "AE Correction Factor vs. Temperature" changes AFR quit a be when cold.

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  3. #3
    Fuel Injected! JeepsAndGuns's Avatar
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    So basicly you are saying that anything above 1, its adding more. I guess that makes sense, I just had no idea what "factor" was supposed to mean.
    What about below 1? I'm guessing that would mean its taking some away?
    79 Jeep Cherokee, AMC 401, T-18 manual trans, hydroboost, 16197427 MPFI system---the toy

    93 Jeep YJ Wrangler, 4.0L, 5 speed, 8.8 rear, homebrew hub conversion and big brakes, hydroboost, 2.5in OME lift, 31x10.50's---the daily driver

    99 Jeep WJ Grand Cherokee limited, 4.0L, auto, 2wd, leather and power everything, 99% stock---the long distance highway ride.

  4. #4
    RIP EagleMark's Avatar
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    Yup, 1.10 is 110% and .80 is 80%

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  5. #5
    Fuel Injected! JeepsAndGuns's Avatar
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    OK, tried adjusting AE correction factor Vs temperature. Since it was going so rich, I adjusted all cells from 68*c and lower to 1.4, then all cells from 80*c and up to 1.0. This does not seem to have made any difference. So next up I guess I will try the tps and map tables.
    Looking at the MAP difference AE correction factor Vs. temperature, its made kinda strange, as its 1.0 at 44*c, then starts to drop down to zero as temps go up. So if a factor of 1.0 is no correction, then what is a factor of 0.0?
    Last edited by JeepsAndGuns; 09-03-2013 at 03:22 AM.
    79 Jeep Cherokee, AMC 401, T-18 manual trans, hydroboost, 16197427 MPFI system---the toy

    93 Jeep YJ Wrangler, 4.0L, 5 speed, 8.8 rear, homebrew hub conversion and big brakes, hydroboost, 2.5in OME lift, 31x10.50's---the daily driver

    99 Jeep WJ Grand Cherokee limited, 4.0L, auto, 2wd, leather and power everything, 99% stock---the long distance highway ride.

  6. #6
    RIP EagleMark's Avatar
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    Maybe 0.0 is no adjustment?

    Strange the other was 1.0 in warmed up areas?

    You still need to look at the Open Loop AFR table as it get's way rich with less vacuum.

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  7. #7
    Fuel Injected! JeepsAndGuns's Avatar
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    Reading one of your comments in another thread (cant remember which one) I set all cells in that table to 14.1 a good while ago. Doing that didnt really seem to have made much, if any difference to cold start/cold engine driving. But I changed that table long before I ever changed my base timing to 0*, so I dont think it would be effecting the issue I'm having?
    79 Jeep Cherokee, AMC 401, T-18 manual trans, hydroboost, 16197427 MPFI system---the toy

    93 Jeep YJ Wrangler, 4.0L, 5 speed, 8.8 rear, homebrew hub conversion and big brakes, hydroboost, 2.5in OME lift, 31x10.50's---the daily driver

    99 Jeep WJ Grand Cherokee limited, 4.0L, auto, 2wd, leather and power everything, 99% stock---the long distance highway ride.

  8. #8
    RIP EagleMark's Avatar
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    That's not affecting your issue set like that.

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  9. #9
    Fuel Injected! JeepsAndGuns's Avatar
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    Ok, fiddled around with it yesterday a little . I got irratated at it from the last change making hardly no difference, and changed "TPS difference AE correction factor Vs. MAT" and "MAP difference AE correction factor Vs. temperature". I changed them both to what the table is at normal operating temps, just to see if it made any difference. I wanted to make sure these were the right parameters. Did a cold start and test drive, and success, it no longer goes pig rich when I accerate and change gears when cold. If anything, it now goes just slightly lean, but not by much.
    Seeing how the table TPS difference AE correction factor Vs. MAT was not a very big change, and the table MAP difference AE correction factor Vs. temperature was more of a larger change, I am thinking thats the one that made the main difference. So I think I will put TPS difference AE correction factor Vs. MAT back to where it was, see how it does, then if needed, very slowly start adding some back into MAP difference AE correction factor Vs. temperature to get to to not go lean when cold.
    79 Jeep Cherokee, AMC 401, T-18 manual trans, hydroboost, 16197427 MPFI system---the toy

    93 Jeep YJ Wrangler, 4.0L, 5 speed, 8.8 rear, homebrew hub conversion and big brakes, hydroboost, 2.5in OME lift, 31x10.50's---the daily driver

    99 Jeep WJ Grand Cherokee limited, 4.0L, auto, 2wd, leather and power everything, 99% stock---the long distance highway ride.

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