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Thread: 8L90E I want a crisp shift. Seems to drag between gears

  1. #41
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    Quote Originally Posted by lucas287 View Post
    Some people like Russ K just recommend turning off upshift TQ mgmt entirely. I'm guessing recommendations like that are for all out performance and don't have longevity in mind?
    I'm assuming his recommendations are for all out performance but I can't speak for him and I don't know the context of his advice. He is a very experienced tuner so he must have his reasons.
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  2. #42
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    Quote Originally Posted by TriPinTaZ View Post
    I'm assuming his recommendations are for all out performance but I can't speak for him and I don't know the context of his advice. He is a very experienced tuner so he must have his reasons.
    Maybe Russ could chime in? @ Russ K (however you do this?)

  3. #43
    Quote Originally Posted by TriPinTaZ View Post
    You will considerably shorten the life of the clutch packs in the transmission if you don't let it pull timing on shift. The best bet is to use Immediate setting in torque recovery. This will pull timing on shifting and then immediately return the timing once the shift completes rather than ramping it back in softly. It works great for bolt on cars but when you start getting into 800+ rwhp on the 10 Speeds it can cause the 4-5 gear to slip the clutches and the trans will flair when trying to shift.
    This is the only field i could find that was even close to Torque Recovery

    Transmission>Torque Management>General>Speed Ctrl Terminate
    Immediate

    Pretty sure that's it.

  4. #44
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    Quote Originally Posted by HellKnightHicks View Post
    This is the only field i could find that was even close to Torque Recovery

    Transmission>Torque Management>General>Speed Ctrl Terminate
    Immediate

    Pretty sure that's it.
    Yes that is it. This will make the ECU immediately allow all of the spark that was removed during shift to come back vs ramping it back in.
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  5. #45
    Senior Tuner Russ K's Avatar
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    This is a tune I did 1.5 years ago. Stock 2018 Denali 6.2 A8 trans. Has 91 octane fuel.
    On the 8 speed trucks, I disable the upshift torque management but leave the downshift torque management stock. Setting the min spark timing has no effect on the downshift timing retard on the 5th gen vehicles.

    On the Camaro & Corvette A8's, I also disable the downshift torque management. But doing so on the trucks, makes the downshifts too harsh.

    The main reason you can disable the upshift torque management on the A8 is due to the closer gear ratios compared to the A6 trans.

    Russ Kemp
    Attached Files Attached Files

  6. #46
    Quote Originally Posted by Russ K View Post
    This is a tune I did 1.5 years ago. Stock 2018 Denali 6.2 A8 trans. Has 91 octane fuel.
    On the 8 speed trucks, I disable the upshift torque management but leave the downshift torque management stock. Setting the min spark timing has no effect on the downshift timing retard on the 5th gen vehicles.

    On the Camaro & Corvette A8's, I also disable the downshift torque management. But doing so on the trucks, makes the downshifts too harsh.

    The main reason you can disable the upshift torque management on the A8 is due to the closer gear ratios compared to the A6 trans.

    Russ Kemp
    Russ K, would you happen to have any A6 examples? I am tuning a 6L45 and would like something to compare to. TIA

  7. #47
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    I have a 2015 Yukon Denali that I have been tinkering with the transmission almost since new. I think I have it set up perfectly now, drive it easy and you don't feel it shift, stomp on it and I get rubber in second with 33" tires and sometimes in 3rd. I hope I attached the tune file properly.

    2015 Yukon Denali 6.2 LT1 Direct Injection Stock Modified 2021-1-21.hpt

  8. #48
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    Lucas287 do you think having the TC unlocked for 1-5 will effect the towing ability or daily driving?

  9. #49
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    Quote Originally Posted by sbcrazy View Post
    Lucas287 do you think having the TC unlocked for 1-5 will effect the towing ability or daily driving?
    I only have the TC unlocked completely 1-4. 5th locks up at 35 MPH. 6th at 29, 7th at 34, 8th at 43. Most of the time when I'm towing it's less than 5k # and I don't spend much time below 35 MPH. Having a 6.2 helps a lot though. Un-laden driveability is a lot better IMO. Keeps it unlocked for most slow city speed accelerating but locks right when you let off and cruise around.

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    Thank you. I am gonna try messing around with the unlocked and locked settings to find what I like the most.

  11. #51
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    I always find that the TC status (locked or unlocked) has a big impact on the overall feel of the shift too. So, i'd suggest finding a TC strategy you like before fine tuning shift feel or else you'll be chasing your tail.

  12. #52
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    Quote Originally Posted by sbcrazy View Post
    Thank you. I am gonna try messing around with the unlocked and locked settings to find what I like the most.
    I was off a bit on my numbers. Here's my latest iteration. Yes, I keep my TC unlocked at WOT. (that's a different contentious debate but I personally don't feel a difference and figure it's easier on the TCC) It's a compromise to find something that works well for the manual mode too. I love driving around in manual mode 1-4 around town when I'm hot-roddin' around and I've found that the TUTD tables do literally nothing in the trucks and they just follow the same "normal" table. Keeping the TC unlocked makes it much more playful - combined with the throttle response of ethanol and it's quite snappy.

    One more note: all these apply values are .5-1 MPH BELOW the shift MPH so that the TC locks immediately at the shift. Feels very direct this way - like my Skyactiv transmissions in my Mazdas.
    TCC.JPG
    Last edited by lucas287; 04-06-2021 at 11:27 AM.

  13. #53
    Quote Originally Posted by Russ K View Post
    This is a tune I did 1.5 years ago. Stock 2018 Denali 6.2 A8 trans. Has 91 octane fuel.
    On the 8 speed trucks, I disable the upshift torque management but leave the downshift torque management stock. Setting the min spark timing has no effect on the downshift timing retard on the 5th gen vehicles.

    On the Camaro & Corvette A8's, I also disable the downshift torque management. But doing so on the trucks, makes the downshifts too harsh.

    The main reason you can disable the upshift torque management on the A8 is due to the closer gear ratios compared to the A6 trans.

    Russ Kemp
    I talked with a local tuner and he said hes had a few trans get fried by disable the TW managment. Ill have to look at your tunes there in a bit more detail. I wonder what hes doing wrong?

    Quote Originally Posted by TriPinTaZ View Post
    Yes that is it. This will make the ECU immediately allow all of the spark that was removed during shift to come back vs ramping it back in.

    That was the ticket thats what finally firmed it all up.

    That and putting 96 in the pressure offset tables.

    Pretty happy with it now. Nice crisp firm shifts then I add more TQ Managment as power increases to protect the transmission.

  14. #54
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    Quote Originally Posted by HellKnightHicks View Post
    I talked with a local tuner and he said hes had a few trans get fried by disable the TW managment. Ill have to look at your tunes there in a bit more detail. I wonder what hes doing wrong?




    That was the ticket thats what finally firmed it all up.

    That and putting 96 in the pressure offset tables.

    Pretty happy with it now. Nice crisp firm shifts then I add more TQ Managment as power increases to protect the transmission.
    Keep in mind this is harder on the clutch packs. If you're making a lot of power, it can wear them out quickly and it will start slipping in higher gears. So keeping some sort of torque management is a good idea. On high HP cars I give my clients two different TCM tunes. One for street and one balls out for when they go to the track and it needs to shift hard every time.
    Last edited by TriPinTaZ; 05-12-2021 at 12:00 PM.
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  15. #55
    Quote Originally Posted by TriPinTaZ View Post
    Keep in mind this is harder on the clutch packs. If you're making a lot of power, it can wear them out quickly and it will start slipping in higher gears. So keeping some sort of torque management is a good idea. On high HP cars I give my clients two different TCM tunes. One for street and one balls out for when they go to the track and it needs to shift hard every time.

    I did not disable Torque Management. At the least it still has 40% as power rises tq management is at %66 4000 and above. Shifts are firm but do not break traction.

    I do have some surging but its very slight and happens quite often. I can feel something at wide open throttle almost like a rotation so until I get some dyno time and start logging again I'm not flogging it nearly as hard.

    I have a Solar throttle body that has veins cut as the TB opens. I feel its responsible for some of the issues as the ECU gets more Air than it anticipates causing the throttle blade to move back and forth a bit. Until I log it that's just a theory. At full throttle I wonder it might be knock not sure.

    Im really wondering if the TQ converters not slipping because It did have that shutter issue. I had the dealership flush the fluid and refill the trans per the tech bulliten.

  16. #56
    Senior Tuner Frost's Avatar
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    Quote Originally Posted by TriPinTaZ View Post
    ... On high HP cars I give my clients two different TCM tunes. One for street and one balls out for when they go to the track and it needs to shift hard every time.

    Yeah I have a few of those too, and with all of the 2650 blowers going around, there will be more to come.
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  17. #57
    Well I think my issue is a common issue running the whipple.

    https://www.ssforums.com/threads/whi...problem.34729/

    Mines not even 50 RPMs after tuning I can just feel it pull a little harder then not. Honestly if I didn't pay a lot of attention I wouldn't notice it.

  18. #58
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    Bringing this thread back up. My 1-2 upshift is very firm almost harsh at times and I would like to soften it up some so it doesn't hit as hard. Tried a couple of things but nothing really changed.
    Any suggestions would be appreciated.

    2016 Sierra Denali - Stock Tune-Myers-DOD off-Idle2-trans-6-tcc tables.hpt
    2016 Sierra Denali 5.3L - All stock but the air filter & GMPP Borla exhaust

  19. #59
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    [QUOTE=JR2010;653977]Bringing this thread back up. My 1-2 upshift is very firm almost harsh at times and I would like to soften it up some so it doesn't hit as hard. Tried a couple of things but nothing really changed.
    Any suggestions would be appreciated.

    Take a look at mine, it shifts smooth when just cruising, but will get rubber in the 1-2 when stomping on it. Also changed the trans fluid to Amsoil, huge difference. The torque convertor stopped banging on decel.

    2015 Yukon Denali 6.2 LT1 Direct Injection Stock Modified 2021-1-21.hpt
    Last edited by V3locity; 06-19-2021 at 09:24 AM.

  20. #60
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    [QUOTE=V3locity;654055]
    Quote Originally Posted by JR2010 View Post
    Bringing this thread back up. My 1-2 upshift is very firm almost harsh at times and I would like to soften it up some so it doesn't hit as hard. Tried a couple of things but nothing really changed.
    Any suggestions would be appreciated.

    Take a look at mine, it shifts smooth when just cruising, but will get rubber in the 1-2 when stomping on it. Also changed the trans fluid to Amsoil, huge difference. The torque convertor stopped banging on decel.

    2015 Yukon Denali 6.2 LT1 Direct Injection Stock Modified 2021-1-21.hpt
    Tune still working good for you? thinking bout using it on my yukon denali with the 8 speed