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Thread: HPtuners

  1. #1
    Join Date
    May 2004
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    anyone know how to tune to keep the rpm's from falling off during a shift point? 2000 Silverado acts like there is a window between shifts.


    97 GMC, 2002 LS6.

    1991 GMC Syclone #1428

  2. #2
    Join Date
    Jan 2005
    Location
    Conway, AR
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    Did you remove the engine TM? I would also look at a higher shift point. Other than that I am not sure what else can be done. you could quicken up the shifts, I set mine in 1st to .150 and in 2-3rd to .125. Also up the line pressure a bit and it should shift quick and snappy, if thats what your looking for.
    2009 Silverado, HPTuners, all stock.

  3. #3
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    No I didn't remove the TM. I'll give what you said a try. I just received the S/W and will get it set up tonight. Thanks for the input!


    97 GMC, 2002 LS6.

    1991 GMC Syclone #1428

  4. #4
    Join Date
    Sep 2003
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    355
    I really honestly do not really understand what you mean by keeping the RPM from falling off during a shift???
    With a higher stall converter there is less RPM drop off between shifts.

  5. #5
    Join Date
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    vortec350, this isn't in my truck. It's a friend of mine. It's stock and doesn't have a stall in it. He just wants a 93 octane tune. The RPM's drop off a little when it changes gear and he's not happy with it. I never had that problem out of my 97.


    97 GMC, 2002 LS6.

    1991 GMC Syclone #1428

  6. #6
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    I think you can try to remove all of the TM in it, but what your talking about can only be cured with a higher stall TC. Raising the shift points will help some, but not alot.

    Chris
    2009 Silverado, HPTuners, all stock.

  7. #7
    Join Date
    Feb 2006
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    2
    a RPM drop is inherant because of the gear change

    I'm guessing you mean an "excessive" rpm drop?
    if so then kill engine torque management (don't do the same on the tranny if it's stock). Speed up the shift timing and maybe bump up the pressure a tad.

  8. #8
    Join Date
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    Location
    Denton Texas
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    20,540
    Sounds like the torque convertor is staying locked between gears. I unlocked my convertor between shifts to keep the RPM up.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  9. #9
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    <div class='quotetop'>QUOTE(Nick &#064; Feb 1 2006, 08&#58;09 PM) [snapback]43118[/snapback]</div>
    a RPM drop is inherant because of the gear change

    I&#39;m guessing you mean an "excessive" rpm drop?
    if so then kill engine torque management (don&#39;t do the same on the tranny if it&#39;s stock). Speed up the shift timing and maybe bump up the pressure a tad.
    [/b]

    Yes, exactly. I&#39;m trying to get the S/W loaded and then I&#39;ll start playing. I appreciate the feedback from you guys.


    97 GMC, 2002 LS6.

    1991 GMC Syclone #1428

  10. #10
    Join Date
    Jan 2006
    Posts
    621
    <div class='quotetop'>QUOTE(RedHeartbeat &#064; Feb 1 2006, 08&#58;35 PM) [snapback]43125[/snapback]</div>
    Sounds like the torque convertor is staying locked between gears. I unlocked my convertor between shifts to keep the RPM up.
    [/b]
    The converter shouldn&#39;t be locked if the tranny is still shifting should it? Mine only locks up in OD if it&#39;s in OD and 3rd if I have it in 3rd.

    [1/8 mile E.T. - 8.23 @ 82.86 mph w/1.82 60&#39;] &#39;98swb,4/6drop,20"RozziDeeps on 275/40ToyoProxes &#39;98LS1/4L60E,TRCheaTR cam,Ported TB,Billet MAF ends,MSD8.5 superconductor wires,S&P midlengths,&#33;EGR,&#33;cats,2 1/2" true duals w/X-pipe,Dynomax Ultraflows,TCI 3000,billet servo,TCI deep aluminum pan,3.73&#39;s w/Auburn posi; Eclipse CD, Rockford 6 1/2&#39;s, Memphis 12&#39;s, Punch 200 ix, Punch 500x

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