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Thread: 6l80e shifts killing me

  1. #101
    Advanced Tuner Niemer's Avatar
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    Quote Originally Posted by Dragon View Post
    I would like to know that also,, is sport mode based on pressures set in pattern Y or Z ?
    You can define that.
    Ported TVS1900 OD cogs 10.5psi | ID850 | Vaporworx CTS-V 1:1 | COMP 219/233 .606"/.605" 113+1 | Ported TB | Pacesetter 1 3/4 LT | Solo Mach X3


  2. #102
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    Quote Originally Posted by BigMike42 View Post
    True, very valid points. The 1-2 is set to 6000 rpm and only 36 mph, it just climbs so fast, so it hits 7k regularly. I can lower the MPH to 34 maybe and give it a bit more lead time.

    Honestly the video in this thread inspired me to try to get them that fast. I wish he'd post back and say what his actual scanner times are saying. Hard to tell from a video, but they look 100ms or less.
    Im still here, but i do most of my tuning with efilive, not hpt. I will try to figure out what i need in the hpt scanner on friday and get some logs, but honestly this car is useless in putting power down on the road unless i roll on from 3rd gear. so i'll try get a 3-4-5 shift.

    I find that with nearly all the 6l80's, u have to pre-empt the shift speeds kph/mph numbers to values below what you'd expect. having accurate tyre size/ppk values is also important too as different profile tyres will effect when it shifts.

  3. #103
    Tuner in Training
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    Hi

    I find this thread very interesting!
    Do you have any experience tuning 8 speed trans 8L90 for GM cars or corvette C7 Z06 2015 +?
    I have the same problems for 1-2 and 2-3 shift
    I have problem with 1-2 shift at full Throttle. Engine rpm go to rev limiter at 6800 rpm, throttle shut down 50% , car slow down and transmission shift.1-2. throttle re open 85% and car re-accelerate.
    blemI have reduce Full throttle RPM 1-2 to 5500 RPM, speed from 30 to 22 MPH.
    I did Reduce shift time from 0.305 to 0.210 sec. Nothing work better!
    Not very good for drag racing!

    Please help me or give me the proper thread.

    Thanks

  4. #104
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    The adapts are slowly lowering shift pressures in order to allow the shift event to happen within the specified target time.
    Think about it.
    Increased shift pressure will make the clutch pack engage quicker.

  5. #105
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    So I adjusted my shift adapt presets this weekend in addition to my previous tune. And it feels awesome at wot but it also seems alittle to harsh. I'm not sure if its good for the trans since its jerks so much, especially part throttle.

    Heres a screen shot of my changes.

    Should I lower the adapt presets down a bit from 550, 1150, 1700.

    Do I have my shift pressure to high and shift speeds to low ?

    Or should I give this a week to " learn" .

    This is in a 500 wheel tvs1900 G8 with a Zl1 converter

    Hows everyone doing long term?
    Last edited by Maxspeed96ct; 01-22-2017 at 07:54 PM.

  6. #106
    Tuning Addict 5FDP's Avatar
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    I don't use KPA, I switched mine to PSI.

    In a truck those on coming pressures would be way high IMO, I have mine no where near close to that.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

  7. #107
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    try 250 in 0
    550 in 1
    1250 in 2

    do a reset and see if that's better.

    not every trans requires a lot of pressure, as they are often all different for wear, upgraded clutches etc. the adapts mainly helps the trans in getting the base pressure closer. the factory seems to run very low pressure from standard and then slowly works up. we are basically starting out high and then it'll learn down.

    thats why it something that needs to be fine tuned on every box so that the adapts don't over correct and make the shifts sloppy again. or you can go the easy way out and turn adapts off. lol

  8. #108
    Quote Originally Posted by Tre-Cool View Post
    try 250 in 0
    550 in 1
    1250 in 2

    do a reset and see if that's better.

    not every trans requires a lot of pressure, as they are often all different for wear, upgraded clutches etc. the adapts mainly helps the trans in getting the base pressure closer. the factory seems to run very low pressure from standard and then slowly works up. we are basically starting out high and then it'll learn down.

    thats why it something that needs to be fine tuned on every box so that the adapts don't over correct and make the shifts sloppy again. or you can go the easy way out and turn adapts off. lol
    I went the easy way out and turned adapts off. They would make the shifts so sloppy it felt like it was slipping bad.

  9. #109
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    250
    550
    1200 seems much better ! Haven't driven it much though

    Now you guys don't tough the off going pressure preset correct ? Mine are all stock

  10. #110
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    I would suggest, if you do this, readapt and drive for a day or so with upshift adapts on, then turn off, dont just have it stupid hard.. let it adjust a bit.

  11. #111
    Sorry to revive this post from the dead, but it's very much alive to me.

    I must be missing something, I set all the values to 1700kpa and it shifts very firm love it! However, upon scanning, I only see 120 psi max on the oncoming PCS. Am I missing something? My trans torque values go into the 700s at some points, but it seems that pressure does not follow torque rise. Almost like there is a dead stop at 120 psi and I've updated the max pressure tables all to above that.

    When I'm driving around or in Drive normal/special all PCS's are preset to 110 psi. I feel like I'm missing something simple.
    Last edited by mourat; 09-19-2017 at 12:43 AM.

  12. #112
    Potential Tuner napier-2's Avatar
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    I have a 15 ss camaro with a BTR stage 3 and a CD 3500 stall and it shifts soft at the 1-2 shift when in 2 it locks then unlocks so im going to try these settings and see what happens, Blue cat helped but did not complety cure my problems at 1-2 but it shifts better but not hard at WOT like it should. we will see.
    2015 Camaro SS Green Flash 6spd
    BTR Stage 3 cam, Dart Pro 1 Heads, Circle D 3500 torque converter
    Small shot.

  13. #113
    Quote Originally Posted by Tre-Cool View Post
    no worries, good to hear.



    i generally don't even touch the base shift speeds, once you firm the shifts up and remove all the shift time adders. the trans will shift quick & firm. I still run full tq mgmt on all mine too. you just tweak the amount of timing that can be pulled in the ecu tune.
    so if 'im reading this correct, you remove the shift time adders? as in, 0 out all the shift time torque adder tables?

  14. #114
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    on the early model ones i do for tapshift mode, but for the normal drive mode i still use it if i want to soften up the shifts. they also had a base shift time table too, so keep that in mind.

    last august i bought back the car i ran the 10.5 in after the new owner i sold the car to busted the motor from running it on lower octane fuel. hopefully i should have a new combo in it soon, so i'll be playing with that again.

  15. #115
    the drivetrain im working on is a 2010 6.0/6l90. I swapped it into an 84 2wd chev 3/4 ton so it weighs something like 4400-4500lbs. I did vvt delete, 228/230 cam, and valve spring so nothing crazy. its a cruiser but im not real concerned with having super soft shifts at part throttle as my daily/tow rig has a built/tuned 4l80 so im used to hard shifts. i want to try your method of setting up the trans but i want to get it right. if i remember correctly the base shift times on this trans are all 0's. so if that's the case do i 0 out the shift time adders? or reduce them by a %? or leave them stock? any help is greatly appreciated, these stock truck trans tunes are sooooo lazy, i hate it.

  16. #116
    Tuning Addict 5FDP's Avatar
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    Post the tune.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.