Shift times all over the place....cant figure this out

[Estep40511]

So rundown on my truck

2014 Silverado
5.3/6L80

rebuilt two years ago (engine and trans)

all GM parts except:

LSXceleration stage 2.1 Cam
Speed engineering long tubes and Ypipe
3.5 in exhaust into Flowmaster 70 series
6.2 intake and TB
Comp cams actuator lock out kit
LT4 springs
hardened stock length pushrods
everything else new GM parts, except for crank
Stock GM converter
Sonnax zip line kit
all new clutches and steels
RECENTLY replaced valve bodies (missing checkball)

Cant figure out this random delayed shifts. Doesnt seem to matter if its cold, hot etc. This is the tune Ive been running in vehicle the longest. Up until I had the missing checkball issue, it would very rarely flare slightly going from 5-6th. Usually run it on E85. Everything on engine side seems perfect. When trans was apart, fluid still red and no metal, etc. I feel like its tune related, because I can load an older tune, and it changes how the trans acts. Shift times are all over the place. Ive done the trans adapt reset also. Somebody help! lol


23-10-16 12-51-59.hpl

[Estep40511]

Starting to wonder if the Torque needs adjustment or DD tables. because it ONLY happens under a light load, or little throttle. I have no idea what to adjust lol

[TransGo Robert]

Starting to wonder if the Torque needs adjustment or DD tables. because it ONLY happens under a light load, or little throttle. I have no idea what to adjust lol

Where in that log did it feel like it was shifting too late or as you put it "all over the place"? the unit seems to be doing what it is asked to do really well, I am not well versed on the tuning side so I won't be able to help if it is a command issue like you suspect. But right now, unless I am not looking at the right place in there the unit seems to be shifting right on time when commanded and the shifts are all nice and short.

[Estep40511]

Where in that log did it feel like it was shifting too late or as you put it "all over the place"? the unit seems to be doing what it is asked to do really well, I am not well versed on the tuning side so I won't be able to help if it is a command issue like you suspect. But right now, unless I am not looking at the right place in there the unit seems to be shifting right on time when commanded and the shifts are all nice and short.

after I got back into town, there was a 2-3 shift that took 1.0 sec. again, under a very light load. and there was one 5-6 shift where it goes to shift, flares slightly, then shifts into gear, that one was .7sec. all other times, it shifts great. Thats what is so puzzling.

[Estep40511]

Looks like around 12:47 and 12:50 are the shifts in question. very light load when it happens.

[TransGo Robert]

Looks like around 12:47 and 12:50 are the shifts in question. very light load when it happens.

Ok I see the 2-3 issue now, that's 100% a command issue, the computer for some reason simply does not ramp up PCS2 like it should during the inertia phase. I am not seeing a 5-6 issue as you describe but my time stamps don't match anything you give so that makes it a bit hard. The one thing that I see that could be misconstrued as a 5-6 flare issue is on the very last 5-6 of your recording, when you tipped on the throttle the TCC slip went up to about 160 and then the went back down just before the 2-6 after the computer ramped up teh TCC apply pressure to compensate for the added load. That's normal, not a problem, but if it bothers you it can probably be tweak in the programing to ramp it up more aggressively so that it does not do that.

[GHuggins]

This is just an initial based off of the log you posted. Couldn't apply the correction factor because that requires the VVE to be nearly 100% dialed in and I couldn't verify how close yours was. Some of this was a projected guess, but until your torque model is right the trans can't be tuned in correctly.

[Estep40511]

This is just an initial based off of the log you posted. Couldn't apply the correction factor because that requires the VVE to be nearly 100% dialed in and I couldn't verify how close yours was. Some of this was a projected guess, but until your torque model is right the trans can't be tuned in correctly.

Ill give this a try today and see how it changes. I reset the trans adapts again last night and drove it. seemed okay. This morning it was okay as well. Im going to do some more research on the Torque model and try to get it dialed in better.

[GHuggins]

If all you're doing is resetting the adapts you might want to do a quick learn. Just make sure to pull a video up with someone using a scan tool with prompts as those are missing from hpt's procedure and follow along with the video. That will make a world of difference on it's own. I know you torque model is wrong just based off of your idle timing and off idle numbers for take off and what not.

[Estep40511]

If all you're doing is resetting the adapts you might want to do a quick learn. Just make sure to pull a video up with someone using a scan tool with prompts as those are missing from hpt's procedure and follow along with the video. That will make a world of difference on it's own. I know you torque model is wrong just based off of your idle timing and off idle numbers for take off and what not.

Im using my MDI2 and GDS to reset adapts. I tried the tune you had on here. seems to really help it. Im getting ready to take it on vacation and then I will dive into this torque model tuning when I get back. Can you suggest videos or threads on here to point me in the right direction?

[GHuggins]

Well I'm probably the only one on here who dials them in The way I do it isn't 100% correct but it gets it close enough to hand edit if need be. I actually had another member on here create a tool to calculate and apply the correction factor back to the map model and it works really nice for that. Having the VE and MAF dialed in is an absolute must and not just the areas where you're normally driving. The VE has to be completely dialed in and for all cam positions if using a variable cam. You can fail the MAF or use Cringer's tools for that. His newest VE tool is pretty dang nice and will get the VE really close with it's auto corrections if you haven't used it. I'm really looking forward to 2.0...

You can shoot me an email for the other tool as it's not public.