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Thread: 2500 stall tuning

  1. #1
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    2500 stall tuning

    Ok guys, I have pretty much nailed down part throttle shifting, I multiplied those by and it seems to do well. I havent touched the TCC lockup so far or the WOT shifts. I need to know what I would need to change on the WOT shifting and the torque converter lockups. Any ideas.

    Chris
    2009 Silverado Crew Cab 5.3L, stock.

  2. #2
    Супер Модератор EC_Tune's Avatar
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    Chris,
    TCC is rather subjective. But here's a stab at it:
    You generally don't want the TCC to pull the engine RPM down more than about 5-700 RPM Max. (Unless you are light - medium throttle & the converter is doing it's slippy slippy dance). At high throttle settings you want it off anyway.

    Log your TPS%, MPH, RPM & TCC. add in the TCC Lock & Unlock status bits as well. That will get you in the ballpark of where you are and where you want to be.

    TCC Unlock usually needs to be 5-10 MPH under the lock state at the same TPS. At higher TPS they get a little closer.

    Start by moving the lower TPS settings down 3-5 MPH. See how you like it. If it sucks, move 'em up 3-5 over the start settings. Then move up the TPS band until you get them where you want them.

    Shift points are a bit easier. You can command the TCC off in the scanner and just run around logging until you find the "happy" place.

    EC
    Always Support Our Troops!

  3. #3
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    Also, have the TCC release points above the previous gear upshift. Otherwise you will downshift before you release the TCC, which sometime all you need is a little rpm boost and not a different gear. I typically like setting my shift points first, to where I like them. Then allow plenty of room for TCC functions.

  4. #4
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    So you want the TCC release settings above the shiftpoints. But how far ahead of that do you want them to apply? Is there just a general rule on how far apart these things should be?

    Chris
    2009 Silverado Crew Cab 5.3L, stock.

  5. #5
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    Take a look at my two bin files, they are from my 2001 Camaro SS (4L60E, 3.73s, 300 B&M Stall) and my 2002 1500HD (4L80E, 3.73s, stock). You will notice that the upshift and TCC apply/release graphs do not intersect, also the TCC release and downshifts graphs do not cross. I have used this as a foundation for many persons' trans tunes and everyone is very happy with it. But in reality it is all personal preferrence. You may want lower/higher rpms for your shift points (part throttle) or more/less rpms for the TCC. Based on if you have a stock damper or aftermarket HD unit.
    Last edited by 12secSS; 04-02-2012 at 06:56 PM.

  6. #6
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    thanks alot man!I see what your talking about, I will try that out tomorrow and see how that goes.

    Chris
    2009 Silverado Crew Cab 5.3L, stock.

  7. #7
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    ok here is my bin file.....if I got what you guys are talking about, I found where I want it to lock at, the shift points are perfect, I just need to see if I have these release settings right.

    Chris
    2009 Silverado Crew Cab 5.3L, stock.

  8. #8
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    Everything looks good, except the 4th apply at 75% TPS. You either need to make the apply 256, as compared your 3 -> 4 upshift, or raise it above your up shift speed.

  9. #9
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    thanks buddy, I tried it and it worked out well, time for some wideband tuning now!

    Chris
    2009 Silverado Crew Cab 5.3L, stock.