Allison 6sp: hanging 3-4 shift

[tinman22]

ok i'm having a WOT dilemma. orignally during my tuning with efi live I got to a point that my shifts were not crisp at the track. specifically the 3-4.
recently I raised my shifting points to 3600 and adjusted fuel and such accordingly but all my shifts were slow.. perhaps slightly flaired. so I adjusted the torque values in the ECM tune and now all the shifts except 3-4 are where I think they should be. I even tried going into the TCM and disabling the rpm torque limit parameter.
is there just more tuning needed to get this adjusted out? i'm kind of bummed because of that delayed shift I missed getting into a 12.7X at the track.
anyone have some ideas?

 

[bullfrogjohnson]

There has been along history of crappy 3-4 shifts in the allison

 

[tinman22]

yea I know that. I guess maybe i'm finally at a power level where its actually REALLY noticeable now.

 

[IdahoRob]

Look at a log and see where that shift is dropping in mm3. My truck hates too much drop in duration(defuel) while shifting. Bring shift mm3 closer to WOT mm3 and see what that does for you.

 

[tinman22]

correct me if i'm wrong but it I disabled in the TCM the torque and rpm limiting shouldnt that cause no defuel? or am I misunderstanding the use of that parameter

 

[Mike L.]

Why are you messing with stuff when you have no idea what you are doing?

 

[IdahoRob]

Why are you messing with stuff when you have no idea what you are doing?

Darn, I thought I had a handle on this stuff. I won't mess with it anymore

 

[rcr1978]

It's a good thing your an honest guy Mike most shops appreciate us breaking shit

 

[LB7Diesel]

The only thing that fixed this prob in mine was eliminatint Torque Mngmnt. I was told by Mike that is a big no no

 

[tinman22]

Why are you messing with stuff when you have no idea what you are doing?

ummmm I need an excuse to go back to cali and visit? lol