flare shift cant figure out how to stop

[TZTuning]

log attached with part and full throttle shifts

flare.hpl

2015 6l80. log doesnt show it, shifts look fine on log to me. Anyway I,ve read the forums and watched videos and i can not fix this issue. my 1-2,3-4,4-5 shifts are perfect, feel fine and shifts just right. the dreaded 2-3 shows up fine on the log, shift time shows its good, however it seems to hang between 2&3 before 3rd engages fully. i have added oncoming preset pressure and it doesnt help, just makes the slam into 3rd harder when it finally hits it, so i went back to as found values for 3rd. i have max adapt volume at 200, preset oncoming at as found values( not sure if stock or not) shift time set to match 3-4 which shifts beautifully.

is this in the offgoing pressure preset or somewhere else?

shift points tuned with bluecat tool, everything seems happy except the 2-3 for some reason. i even tried copying everything from the 3-4(then the 1-2) into the 2-3 to see what that would do and it didnt help at all. didnt change anything. i reset adapts each time i made a change.

[Estep40511]

log attached with part and full throttle shifts

flare.hpl

2015 6l80. log doesnt show it, shifts look fine on log to me. Anyway I,ve read the forums and watched videos and i can not fix this issue. my 1-2,3-4,4-5 shifts are perfect, feel fine and shifts just right. the dreaded 2-3 shows up fine on the log, shift time shows its good, however it seems to hang between 2&3 before 3rd engages fully. i have added oncoming preset pressure and it doesnt help, just makes the slam into 3rd harder when it finally hits it, so i went back to as found values for 3rd. i have max adapt volume at 200, preset oncoming at as found values( not sure if stock or not) shift time set to match 3-4 which shifts beautifully.

is this in the offgoing pressure preset or somewhere else?

shift points tuned with bluecat tool, everything seems happy except the 2-3 for some reason. i even tried copying everything from the 3-4(then the 1-2) into the 2-3 to see what that would do and it didnt help at all. didnt change anything. i reset adapts each time i made a change.

post your tune, if able. Mine used to do that on the 2-3 and occasionally on the 5-6. Could be a driver demand setting, or pressure settings not right. I know now that the engine side has to be dialed in pretty much on the money if you want the trans to shift correctly.

[TZTuning]

post your tune, if able. Mine used to do that on the 2-3 and occasionally on the 5-6. Could be a driver demand setting, or pressure settings not right. I know now that the engine side has to be dialed in pretty much on the money if you want the trans to shift correctly.

Will do this afternoon when I get to my laptop

[TheMechanic]

Not sure if this will help but in BlueCat tool there is a "Shift lead time" on the main page. In the "Advanced" settings you can modify shift time specific to each gear change. Maybe a small experiment with that may help with the problem. I think TransgoRobert would be the best guy for additional advise on this. Seems I have read about this very issue not long ago.

[TransGo Robert]

Not sure if this will help but in BlueCat tool there is a "Shift lead time" on the main page. In the "Advanced" settings you can modify shift time specific to each gear change. Maybe a small experiment with that may help with the problem. I think TransgoRobert would be the best guy for additional advise on this. Seems I have read about this very issue not long ago.

I have been following this one but can't really offer help because the log that was posted does not include most of the transmission PIDs. Also it did not act up in the recording according to the OP, so it would be hard to figure out the problem. A log including all the transmission PIDs and when it is acting up is what I would need to be able to help on this one.

[TZTuning]

I have been following this one but can't really offer help because the log that was posted does not include most of the transmission PIDs. Also it did not act up in the recording according to the OP, so it would be hard to figure out the problem. A log including all the transmission PIDs and when it is acting up is what I would need to be able to help on this one.

id be glad to attach a new log. It acts up in the log attached on each 2-3 shift, however looking at how it shifts according to other shifts it looks normal, but as you said i dont have all of the pids necessary in the channels.

What all pids to i need to log?

[TransGo Robert]

id be glad to attach a new log. It acts up in the log attached on each 2-3 shift, however looking at how it shifts according to other shifts it looks normal, but as you said i dont have all of the pids necessary in the channels.

What all pids to i need to log?

Here's a channel configuration with all the transmission PIDs needed. 6L80 With Trans PIDs.Channels.xml

[Alvin]

Its really important to see the tune. This is behavior you'd expect to see when pressures have been modified but it's still targeting a slow shift time.

Set up desired shift times first !!!

[TZTuning]

trans 6l80e shift log.hpl

final eng, trans try3.hpt

currrent tune and log attached with requested pids . i did several start and stop with some more spirited than others.

truck was tuned prior to my tuning it. i've tried normal shift mode and special and they both have the same results.

trans and converter were replaced when i purchased truck, has around 35,000 miles on it, rest of truck has 160,000 miles.

I have played with shift times and oncoming and off going pressure. None of the 3 seem to help, pressures only make the slam into gear harder. Time seemed to have no effect. And this tune is where I stopped messing with it due to time constraints

[GHuggins]

Take a look at your final normal and final special. Set around .2... You have negatives in the output torque factor to help, but still pretty high finals. I didn't look at the rest.

There was also supposed to be an update from GM for this. Pretty sure they changed background items as I don't remember being able to see anything looking at one that had it done. Most likely changed a multiplier somewhere as I know there are some for the torque models influences on the transmissions line pressures.

[TransGo Robert]

trans 6l80e shift log.hpl

final eng, trans try3.hpt

currrent tune and log attached with requested pids . i did several start and stop with some more spirited than others.

truck was tuned prior to my tuning it. i've tried normal shift mode and special and they both have the same results.

trans and converter were replaced when i purchased truck, has around 35,000 miles on it, rest of truck has 160,000 miles.

I have played with shift times and oncoming and off going pressure. None of the 3 seem to help, pressures only make the slam into gear harder. Time seemed to have no effect. And this tune is where I stopped messing with it due to time constraints

Ok it sure looks like command issue to me. I don't know enough about tuning to point you in the right direction but on the 2-3 the ramp up of PCS 2 is not right causing a bit of a bind when it tries to shift. You also run it fully unlocked and the converter seems to have a bit higher stall than the factory, so it makes for a very poor 2-3 shift. But if the command was right I thin the shift feel would be good regardless. The only thing I noticed in your tune that I think "might" be related here is the max volume in the adaptive for the 2-3. It is normally at 40 unlike all the other ones that are at 200, but yours has been changed to 200. I know just enough about tuning to be dangerous, so this might be a regular modifications guys do, I don't know... Also when you get to 40% or more throttle there's some major torque management kicking in dropping the throttle during the shifts which might also make it feel bad. Max.png

[TZTuning]

FINAL AND DONE WB 11-4.hpt

final.hpl

I appreciate the help and information. this is where i wound up being the most satisfied with the shift feel, the 2-3 still is a tad slower than one may like but it doesnt bang into 3rd anymore, nor does it feel like its hanging in 2nd, nice smooth engagement of 3rd gear. once again i appreciate the help, this had me stumped and i could not figure out what i had changed to cause it. i went back to my as found file and did some comparison and split the difference on several things and now it feels good again.

[TransGo Robert]

FINAL AND DONE WB 11-4.hpt

final.hpl

I appreciate the help and information. this is where i wound up being the most satisfied with the shift feel, the 2-3 still is a tad slower than one may like but it doesnt bang into 3rd anymore, nor does it feel like its hanging in 2nd, nice smooth engagement of 3rd gear. once again i appreciate the help, this had me stumped and i could not figure out what i had changed to cause it. i went back to my as found file and did some comparison and split the difference on several things and now it feels good again.

Those shifts look pretty good now, glad you figured it out. I see you did not change the 200 back to 40 so that's not what fixed it, it is all the other adjustments you made that fixed it. Good job.

[TZTuning]

I tried changing it back and it actually made it worse, so went back to 200. I believe it was a oncoming pressure issue or shift timing issue. That was the main things I went backwards on

[TransGo Robert]

I tried changing it back and it actually made it worse, so went back to 200. I believe it was a oncoming pressure issue or shift timing issue. That was the main things I went backwards on

Well you did good, no more binding at all.

[GHuggins]

Don't know if you can copy or change OS's, but for what it's worth, this one has the background fix for the 2-3 shift flare fixed from GM. I know I've had a few people over the years get this done and it completely fixed the issue. I just don't remember if it's possible to completely flash the OS without screwing something up. Best to use TIS if you have the ability to do so.

[TZTuning]

I’ll sure check into it. Appreciate that.

[hjtrbo]

TransGo Robert , would you mind posting up a screen shot of the bind you were seeing? Always intrigued me what to be looking for...

[TransGo Robert]

TransGo Robert , would you mind posting up a screen shot of the bind you were seeing? Always intrigued me what to be looking for...

Sure, will do first thing tomorrow.

[TheMechanic]

Don't know if you can copy or change OS's, but for what it's worth, this one has the background fix for the 2-3 shift flare fixed from GM. I know I've had a few people over the years get this done and it completely fixed the issue. I just don't remember if it's possible to completely flash the OS without screwing something up. Best to use TIS if you have the ability to do so.

I looked at TIS with the VIN and didn't see the update. Is that because of the OS? What changes were made? Ah just looked at your file and see the RPR Calibration on the transmission OS. Did you do a compare from the before? Any time I do an update on a vehicle I throw on the old HPT and do a before and after to see what is changed (that I can see).