Duramax Diesels Forum Truck of the Week
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Old 12-17-2017, 08:30 AM
05dmaxlly 05dmaxlly is offline
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Default Tcm calibration

Hello, i have a 05 lly and i remember reading a while back that there was a calibration from the 01 or 02 lb7 that guys were running in lly cause it shifted better and didn't learn quickly. and something about one of them not locking the converter on shifts if i remember correctly.
well i have my 05 ccm with the calibration it came with 15196784 and i recently acquired an 01 tcm that has calibration 15172881 in it. my question is with one is better or does it not matter, as i have not seen anyone talk about it in a long time.
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Old 12-17-2017, 09:05 AM
bmc1025 bmc1025 is offline
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Old 12-17-2017, 04:03 PM
05dmaxlly 05dmaxlly is offline
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i followed post back to 2013 i found one where he mention it being a dumb os but nothing about the lockup.
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05 SILVERBERCH EXT CAB LLY
EFI Live ROB AT ATP
S&B LBZ Intake+Mouthpiece
ProFab up pipes
ProFab high flow bridge
HSP Downpipe
4in straight piped
Sleeves and braces
Raptor 150
Race valve
Billet converter and kit
Boost and pyro gauges
Roll pan+Big chevy hitch
H2s and 33s

13.00 @104 4/10/2011
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Old 12-17-2017, 05:30 PM
05dmaxlly 05dmaxlly is offline
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so i did find this from ben.
[QUOTE]ALL of the TCM OS's except one have those D5231, D5233 tables mapped out.

2004.5+ TCM OS's also have an additional table, D5232, "TCC apply slip limit at full throttle"...Ross said that D5232 does not exist in 2001-2004 LB7 OS's.

Go figure, the one 2001 TCM OS that I love and exclusively use (15175854) is the one that doesnt have those tables mapped out yet.

There are several 2001 TCM OS's. All of the 2001 OS's except 15175854 have the tables mapped, and all 2002+ TCM OS's have the tables mapped.

Cindy (cindy meyers, at EFILive) sent me an email saying that Ross is working on it and in the next public release, 15175854 will have the TCC protection tables mapped out. So in the mean time, I just switched to another 2001 OS, 15079907, which does have the TCC protection tables mapped.

The reason that 15175854 is my favorite, is because it shifts the best, and the adapts are slowed way down so you can "sneak up on the F'er" (as Mike says ) and it doesnt freak out. IE, you can go from a tow tune to a race tune and its right there...shifts perfectly every time. As you go progressively "newer" with the OS's, the adaptive learning seems to get smarter and smarter. So, late 2001 OS's are kinda okay, 2002 OS's are kinda okay, 2003-2004 LB7 OS's are a little worse, and 2004-2005 LLY TCM OS's are a disaster when you jump around on HP level without giving it a chance to relearn.

BUT...the kicker is that the 2004-2005 LLY TCM does have a huge redeeming factor that none of the other TCM OS's have. The 04-05 LLY OS does NOT release TCC under part-to-full-throttle kickdown when the TCC is locked. So with an 04-05 LLY TCM OS, when you're on the highway in 5th locked, and you stuff it to go pass someone, the TCC stays locked through the 5-4 WOT downshift and never unlocks.

2001-2004 LB7 TCM OS's, under any locked downshift above 10% throttle, the TCM unlocks TCC, performs the downshift, and then relocks TCC. Its annoying because when you go to pass someone on the highway and do a WOT 5-4 downshift, the TCC unlocks, and you're sitting there, RPM's screaming, not accelerating for a second or so before the TCM relocks TCC and you actually start getting the power to the wheels again.

The only conditions in which a 2001-2004 LB7 TCM OS will do a locked downshift is under 10% throttle when in tow/haul mode...for grade braking purposes (because that would degrade grade-braking performance to unlock TCC during a grade-braking-downshift). Like I said, its annoying and I dont know why Allison programmed it that way on 2001-2004 TCM OS's, and then decided otherwise on 04-05 TCM OS's.

So yeah...there is no "perfect" TCM that combines everything.

My perfect/ideal TCM would be:

1) The shifting and slow-learning/adapts of 15175854
2) Auto high-idle support for LLY's (if you run 15175854, auto high-idle doesnt work on LLY's, on 2002+ TCM OS's, auto high-idle works)
3) WOT TCC-locked downshift programming of 04-05 LLY OS

Oh well. I can live without auto high-idle working, but TCC release on WOT downshift is really annoying on the 01-04 OS's. At some point I would like to try to compare bins in hex and see if I can add the 04-05 TCC attributes to the earlier OS's. Because I doubt anyone else is picky enough/cares enough to look into it.......

There are some other tables, D5073, D5074, D5075 that were added in the latest EFILive version too. I havent found out what they do yet. At first I thought they might be for the above mentioned issue (unlock on WOT downshift in the 01-04 OS's....but when I compared D5073, D5074, D5075 in both 01-04 and 04.5-05 OS's, they were identical....so obviously that mystery "unlock on WOT downshift" table is hidden and isnt mapped unfortunately.

D5067, D5068, D5069 "TCC WOT release" do nothing. Ive set those all to low MPH on 01-04 OS's and it still unlocks under WOT downshift. IMO there are a lot of Allison tables in EFILive that are either mis-labeled, or dont do anything at all......... Ben/QUOTE]

according to this the 5854 is the best one as far as shifts. and according to the file i have the 2881 i believe it is from an 02. he says in that post that 02 os is kinda okay. would there be a big difference switching to that os? or should i just put the stock 05 os back in.
__________________
05 SILVERBERCH EXT CAB LLY
EFI Live ROB AT ATP
S&B LBZ Intake+Mouthpiece
ProFab up pipes
ProFab high flow bridge
HSP Downpipe
4in straight piped
Sleeves and braces
Raptor 150
Race valve
Billet converter and kit
Boost and pyro gauges
Roll pan+Big chevy hitch
H2s and 33s

13.00 @104 4/10/2011
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  #5  
Old 12-17-2017, 05:43 PM
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frankenstien frankenstien is offline
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I don't know shit about tuning, or os swapping etc.

but my truck is built very similar to yours, have you thought about a TCM tune? or if you know what you're doing, tune it yourself? I had mine tuned from a vendor on here and its a wold of difference, especially with the bigger tires.

just a thought
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