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Thread: Tuning a 4L60E with Transgo HD Shift Kit

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    Senior Member blsnelling's Avatar
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    Default Tuning a 4L60E with Transgo HD Shift Kit

    I'm looking for advise on tuning the trans in my truck. I just put a 6.0 in front of it, hoping for 400 RWHP. I've had a Transgo HD shift kit in it for some time with aluminum accumulator pistons, and 4th gear hold servo. I had a 'vette 2-4 servo in it before, but didn't like the harsh 1-2 shift. That was before the stall converter. Probably wouldn't be an issue with my PT3200.

    I currently have all shift times set to 0.00. I understand that's what I want since I have the shift kit in it.

    What about Trans Pressures? I currently have all stock Performance pressures in the Base Pressure Shift tables, for both Normal and Performance columns. All other pressure tables are stock.

    Of particular concern, I'm getting an occasional 2-3 flare at part throttle. I never had this happen before the new converter, engine, and tune. Any ideas there?

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    Try reading through the threads below ... I used the transmission tuning tutorial by Joecar when I was trying to learn "how things worked" ... it's a good read.

    http://forum.efilive.com/showthread.php?t=1723
    http://forum.efilive.com/showthread.php?t=5876
    http://forum.efilive.com/showthread.php?t=10773

    There are more tutorials in the "General information" portion of the Forum under the "Tutorials" category. Joecar has been busy sourcing applicable threads, and grouping these in a logical manner.

    Couple of more threads regarding trans mods and the TransGo HD2 kit ...

    http://forum.efilive.com/showthread....shift-firmness
    http://forum.efilive.com/showthread....during-upshift


    Regards,
    Taz

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    Joe (Moderator) joecar's Avatar
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    Hi blsnelling,

    Welcome to the forum

    If your PT 2->3 shift flares, then see if this makes any difference:
    - increase the 2->3 pressure table;
    - set the 2->3 shift time table to 0.2 seconds all across (yes, this is counter-intuitive );

    Post your .tun file.

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    Senior Member blsnelling's Avatar
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    Thanks Taz.

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    Senior Member blsnelling's Avatar
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    I think I narrowed this occurance down. If left in D, it shifts properly. If I start off with it pulled down in 1st, to keep it from shifting as I feather the thottle to prevent too much wheel spin, and then move it to 3rd, the 1-2 is great, but 2-3 flares BADLY. I hit 6700 RPMs before I let off. I then made two more runs with it in D, and it shifted correctly from 2-3 both times, no flare at all. What would cause that?

    This has probably existed before now, but I've never had a problem with wheel spin, so never had to pull it into 1st to keep it from shifting as I feathered the throttle

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    Senior Member blsnelling's Avatar
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    Quote Originally Posted by joecar View Post
    Hi blsnelling,

    Welcome to the forum

    If your PT 2->3 shift flares, then see if this makes any difference:
    - increase the 2->3 pressure table;
    - set the 2->3 shift time table to 0.2 seconds all across (yes, this is counter-intuitive );

    Post your .tun file.
    I did bump the 2-3 pressures +6. My shift times are all at 0.0. You're saying to up them to 0.2? Yes, that's counter-intuitive How would that work? The above post may change your response though.

    Here's ,my tun file. My Modified_02.tun
    Last edited by blsnelling; October 3rd, 2010 at 07:22 AM.

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    Hello blsnelling,

    Took a quick look at your trans tune – with an eye toward the 2>3 shift issue you described.


    Couple things became evident:
    • Performance tables have been copied over in Normal tables – values are the same in both
    • all desired shift times have been set to zero

    To assist with the 2>3 shift issue, try:

    D1102 (Low Pressure Adjust 2-3 Shift) – set all cells to zero (like the 3-4 shift)


    D0702 (Base Pressure 2-3 Shift)
    • currently doesn’t reach maximum line pressure (96 PSI) until delivered engine torque reaches 458 Ft-lbs
    • becomes a case of “too little too late”
    • I prefer maximum pressure (96 PSI) to be reached in this table by 295 – 310 Ft-lbs


    D0802 (Torque Reduction 2-3 Shift)
    • currently set around 8% - 10%
    • OEM LQ9 4L60E values top out at 38%
    • would set these in the 15% - 20% range until the 2>3 shift issue is resolved – then decrease as appropriate – currently putting a lot of stress on that clutch pack

    Regards,
    Taz

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    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by blsnelling View Post
    I did bump the 2-3 pressures +6. My shift times are all at 0.0. You're saying to up them to 0.2? Yes, that's counter-intuitive How would that work? The above post may change your response though.

    Here's ,my tun file. My Modified_02.tun
    Try the attached file.
    Attached Files Attached Files

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    Senior Member blsnelling's Avatar
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    Thanks for the tips Taz. I had not yet noticed D1102. I've been playing with a lot of trans tables, but that wasn't one of them. That might really help. I also like your idea on D0702. Probably very wise advise on D0802 as well. Wasn't sure where to put torque reduction. Do you see a problem with Performance pressures in the Normal tab? I'm wanting to leave the Performance mode for what little towing I do, so made the Normal like some might the Performance mode.

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    Senior Member blsnelling's Avatar
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    Quote Originally Posted by joecar View Post
    Try the attached file.
    Thanks. I'll check that out when I get back to my laptop later this evening.

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