TC Lock-Up Switch

[TrentNell]

Mike Im running 4L80 speed sensors in mine. With this refreshed 1057 lockup IS definetly a little faster because the converter isnt loosey-goosey, but still, it sometimes wont lock until 3rd gear.

ben

something i have thought about while watching my logs .... our rpm window is so short in 2nd gear .... i have watched on my logs and the slip rpm is droping like its trying to lock in 2nd ( or being fully coupled anyway) and then you can see it go back up for the disengagement for the 2-3 shift then it starts to drop again and locks up, in mine locks bottom-mid of third @ 50 mph + or - 1 , i wonder if on the looser converters ( 1055,1058, ) if it's taking to long to couple for that short window on the higher powered trucks .... boy i wish i would have known when lockup was cammanded . i will have that answer this weekend . thinking this doesnt apply for you though Ben yours seems a bit diff than mine . i will post up my log for you to compare with what you have logged .

i am not concerned for my truck it feels fine just trying to help by comparing data and feel it would be nice to lock up a touch earlier .

 

[Mike L.]

I had a light wired in (rigged in more like it) at Famoso last year. I was locking in 2nd gear, everything seemed fine. I had a intermittent problem on a run but the rest looked good and lockup looked and felt great. I'll try to get a light hooked up again and see if I am still seeing that. I wasnt really paying much attention to lock up back then as it felt great.


12.7 run, with a 1058, my TCM tuning.

Also I have had people in my truck that have 1058s and they think my truck feels way different than theirs. What did you do differnt to mine Mike lol

Nothing different Mike. Working on this right now.

 

[MMLMM]

Nothing different Mike. Working on this right now.

Ok so I just went out and played with my stock TCM file. I too am not locking in 2nd. NO matter what I try. I need to check mph which I will do in a bit but I just played on my street and can only get up to 40ish mph lol. However, It will lock in T/H right away if it shifts into 3rd. In second gear at low mph, T/H on, I get about 400-500rpm slip from the converter and never fully locks. Not even at WOT in 2nd gear.

 

[Alligator]

Ok so I just went out and played with my stock TCM file. I too am not locking in 2nd. NO matter what I try. I need to check mph which I will do in a bit but I just played on my street and can only get up to 40ish mph lol. However, It will lock in T/H right away if it shifts into 3rd. In second gear at low mph, T/H on, I get about 400-500rpm slip from the converter and never fully locks. Not even at WOT in 2nd gear.

So yours does exactly what mine does Mike...

 

[TrentNell]

Nothing different Mike. Working on this right now.

you got time for a phone call on this subject ? i have some things i want to test this weekend . from my log i show only spending 1.01- 1.204 secounds in secound gear .... thats a mighty short window ?

on edit : further more i dont see gaining anything because of the short amount of time on the table that it was not locked . 30 mph-50mph 1.2 sec i doubt being locked would shave much more than a 10th off of that .

 

[Mike L.]

you got time for a phone call on this subject ? i have some things i want to test this weekend . from my log i show only spending 1.01- 1.204 secounds in secound gear .... thats a mighty short window ?

Call me.

 

[DuramaxPowered]

mine seems to lockup at commanded speeds, EXCEPT at 100%TPS...... I'm going to try something off the wall, and throttle stop the pedal at 95% since full fueling happens at 90%TP and up in my tune........The TCM might run off different tables if not at "100%" and lockup..........

 

[Mike L.]

you got time for a phone call on this subject ? i have some things i want to test this weekend . from my log i show only spending 1.01- 1.204 secounds in secound gear .... thats a mighty short window ?

on edit : further more i dont see gaining anything because of the short amount of time on the table that it was not locked . 30 mph-50mph 1.2 sec i doubt being locked would shave much more than a 10th off of that .

Trent
You just hit it on the head. Great observation.:cool2: We discussed this today.
Looks like there is not enough time in second gear hold, and by the time TCC is about to be commanded it is time to release it. TCC will not apply under these conditions.

 

[TrentNell]

After talking to mike today i think we both agree that on my truck and most others the window for 2nd gear lock up is just too short for the higher powered trucks with looser converters .
The rpm drop between first gear and secound gear on the looser converters looks to be 500 rpm or so ... meaning if you shift @ 3600 you will start out 2nd @ around 3050 or so ... that gives a very short window for the converter to lock , the tighter converters may lock secound gear because the rpm drop would be greater and thus the window increased for lock up time .
I can see in my log that it starts to lock and then has to be released for the 2-3 shift and then locks as soon as 3rd gear is settled . i am going to try a few things this weekend with mike's guidance to see if we can tweek it a little in the tune .
But truthfully i dont think it will happen with out a lockup controller wich might be in the future for all of us once some on figures out how to make one. I think mike has a few tricks up his sleeve .

The real question is do we even need to worry about it ? IMOP i dont think we do it would be nice but i dont think its costing any of us more than a 10th in the 1/4 because of the small time it would lock in secound gear and have to realease lock anyway to shift gears and re-locking in 3rd. not to say this fits all trucks this would be for a "normally operational truck" with a healthy converter . if we had a lock up controller and could lock it @ the bottom of secound and keep it locked the whole run then yes we could gain alot . i will post up the logs from this weekend before and after to see if we can improve it or not .

 

[camcojb]

Trent
You just hit it on the head. Great observation.:cool2: We discussed this today.
Looks like there is not enough time in second gear hold, and by the time TCC is about to be commanded it is time to release it. TCC will not apply under these conditions.

ok, what about us who can't get third to lock either? There are several in this thread that can only lock 4th and 5th at the track.

Jody

 

[TrentNell]

Trent
You just hit it on the head. Great observation.:cool2: We discussed this today.
Looks like there is not enough time in second gear hold, and by the time TCC is about to be commanded it is time to release it. TCC will not apply under these conditions.

we posted @ the same time :rofl:

 

[TrentNell]

ok, what about us who can't get third to lock either? There are several in this thread that can only lock 4th and 5th at the track.

Jody

do you have log you can post ?

 

[duratothemax]

why does the converter have to unlock for the 2-3 shift......

if you poke along at 25mph in second gear in tow/haul (so the converter is already locked) and then floor it, it never unlocks during the 2-3 shift. Also, ive noticed different TCM OS's handle lockup a little differently. If you are at ~65mph locked in 5th, and you go to pass someone and it kicks down to 4th, with a 2001 OS TCM, it unlocks, downshifts, then relocks. 2005 OS it stays locked through the downshift. hmm

ben

 

[camcojb]

why does the converter have to unlock for the 2-3 shift......

if you poke along at 25mph in second gear in tow/haul (so the converter is already locked) and then floor it, it never unlocks during the 2-3 shift. Also, ive noticed different TCM OS's handle lockup a little differently. If you are at ~65mph locked in 5th, and you go to pass someone and it kicks down to 4th, with a 2001 OS TCM, it unlocks, downshifts, then relocks. 2005 OS it stays locked through the downshift. hmm

ben

on my tcm it unlocks on any downshift. If its locked in tow/haul in say second gear and you go wot at a point it won't downshift, then it's perfect, stays locked throughout all gears. Just don't let it downshift.

I wish we could do a full flash of the tcm like we can the ecm. I'd love to try another os and see if it helps.

Jody

 

[TrentNell]

why does the converter have to unlock for the 2-3 shift......

if you poke along at 25mph in second gear in tow/haul (so the converter is already locked) and then floor it, it never unlocks during the 2-3 shift. Also, ive noticed different TCM OS's handle lockup a little differently. If you are at ~65mph locked in 5th, and you go to pass someone and it kicks down to 4th, with a 2001 OS TCM, it unlocks, downshifts, then relocks. 2005 OS it stays locked through the downshift. hmm

ben

i dont think it does have to unlock for the shift ( mechanicly speaking) , but getting the initial lock up cammand might still be a problem . i dont know... good point Ben i just have the info from my truck. what year OS are you currently running ?

 

[camcojb]

do you have log you can post ?

here's one. I have several that don't lock until fourth gear.

 

[TrentNell]

on my tcm it unlocks on any downshift. If its locked in tow/haul in say second gear and you go wot at a point it won't downshift, them it's perfect, stays locked throughout all gears. Just don't let it downshift.

I wish we could do a full flash of the tcm like we can the ecm. I'd love to try another os and see if it helps.

Jody

i would dare say if its not locking till 4th-5th gear the converter is suspect , have you tried another converter ?

 

[camcojb]

i would dare say if its not locking till 4th-5th gear the converter is suspect , have you tried another converter ?

no, but it's been that way since I started logging. I have logs from my old combo over a year ago and the shifting is the same. Locks perfect at any tp except 100%. I still think this converter slips too much causing a table to deny lockup until it "catches up".

I'll also add that there are several of us with the exact same issue; no locking in third or second gear. I guess I can live with the second gear one, but I know many guys can get third and I want it too..................
Jody

 

[TrentNell]

here's one. I have several that don't lock until fourth gear.

that converter is looser than my 1055 , almost no rpm drop from the 2-3 shift . i would be sending that thing to suncoast . even if it was a command problem the rpm drop should higher even unlocked . but mike would have to answer for shure . here is a log from my 1055 , not a tcm but you can see the rpm drop . converter locked like normal around 49-52 mph i think , going to get some logs from efi this weekend other tcm logs are hp tuners format .

 

[camcojb]

that converter is looser than my 1055 , almost no rpm drop from the 2-3 shift . i would be sending that thing to suncoast . even if it was a command problem the rpm drop should higher even unlocked . but mike would have to answer for shure . here is a log from my 1055 , not a tcm but you can see the rpm drop . converter locked like normal around 49-52 mph i think , going to get some logs from efi this weekend other tcm logs are hp tuners format .

yeah, I'm waiting on a price from Mike to change to the tightest 3 disc converter they have. I've heard the 1058 I have has had lockup issues on several trucks, not just me. That's why I'd love to get it to lock in third, but I'm probably wasting my time.

edit: just looked at your log, big difference in rpm drop down low. Mine just slips...............

here's a log from 2-14-08, a month after I bought the converter. Same thing, maybe 200 rpm drop or so in rpms on the 2-3 shift.

Jody