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Thread: Tool to help tune A4 shift points...

  1. #51
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    Quote Originally Posted by Mean Green Z28 View Post
    don't 4L80E's unock TCC for shifts? I've seen that in my logs. It'll go 1>2>3>LOCK>UNLOCK>4>LOCK ... annoying
    It unlocks after the fact when it realizes what it just did, so 1>2>3>LOCK>4>UNLOCK>LOCK. I think I just need to have 3rd lock later or 4th upshift sooner so it doesn't get confused.
    1998 GMC Sierra K1500 5.7/4L80E, longtubes, 411 w/COS 5, marine cam/intake, Whipple. 91 octane at 6000'.
    1997 GMC Sierra K3500 7.4/4L80E, 411 w/COS 3, Whipple, small cam.
    2004 Corvette Z06 with longtubes.

  2. #52
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by Supercharged111 View Post
    It unlocks after the fact when it realizes what it just did, so 1>2>3>LOCK>4>UNLOCK>LOCK. I think I just need to have 3rd lock later or 4th upshift sooner so it doesn't get confused.
    Post your tune file... and the spreadsheet with your shift/tcc tables in it.
    Last edited by joecar; January 25th, 2017 at 09:29 PM.

  3. #53
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    Quote Originally Posted by Mean Green Z28 View Post
    can someone look at this? I copied the 4L60E shift points in (they're a bit higher) and then adjusted the downshift curves to not intersect any other curves, then played with the TCC curves.

    Thanks!
    You've got your 3rd gear TCC lockup the same speed as your 3-4 shift.... that's not good. You should have 3rd gear TCC set higher than the 3-4 shift. 3rd gear TCC lockup should only happen if you manually lock the gear selector into 3rd gear.

  4. #54
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    Quote Originally Posted by statesman View Post
    You've got your 3rd gear TCC lockup the same speed as your 3-4 shift.... that's not good. You should have 3rd gear TCC set higher than the 3-4 shift. 3rd gear TCC lockup should only happen if you manually lock the gear selector into 3rd gear.
    Thanks, fixed ... how does this look? just bumped the 3rd gear TCC numbers up by about 4mph
    Attached Files Attached Files

  5. #55
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    well I tried the spreadsheet values I made following this and it made the trans very busy.. Probably due to the 3.42 gears and the 4L80E's steep gearing with the 78mm turbo on the 5.3 (Read: Lag) that I have to really get into the throttle to get her going and the trans constantly shifts and TCC locks/unlocks, etc. Copied the 4L60E tune shift points that I remember to be a nice mix of performance like feel and drive-ability on this trans. Will still keep playing around.
    Last edited by Mean Green Z28; July 26th, 2017 at 07:07 AM.

  6. #56
    Joe (Moderator) joecar's Avatar
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    Move the sloped part of the shift curves to a higher TPS%.

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