Info: TCM tuning
- Thread starter ZeroGravity58
- Start date
I have 100's of passes on my truck... Trans has almost 100k miles (ok 96k to be exact) and 4 years on it. Its had a couple bigger single turbos for 95k miles, and in the past 25k miles it has twins/injectors. I was a beta tester for EFILive 4 years ago so its had all sorts of stupid tuning done to it. Not to mention daily abuse and towing.
Just because I dont post every time I go to the track and make a big deal out of it like everyone else doesnt mean I dont work my trans hard or my truck doesnt make decent power. You guys can use some of your fancy calculators to see what kind of hp it takes to make a 7680lb (with me in it, race weight confirmed by scales) go 12's at 107-108mph in the 1/4. That was back in early 2006...which wasnt all that slow back then.
I dont know the power, my truck has never dyno'd well. Dyno's are a stupid way of measuring a trucks true real-world usable power anyways. It dyno'd like 430rwhp or something odd like that. Yes its actually a lot more hp than that. That was with 285 BFG's and heavy 18" eagle alloy wheels. Guarantee its a lot more than 430rwhp to push 7680lbs 108mph in the 1/4.
duh... There have been so many people that have had to refresh their trans at much lower hp levels than mine.
FWIW, I built a trans for my frined's 2005 LLY CC/SB. Its lifted on 35's. He runs an Aurora 5000 with a big tune and has drag raced it plenty of times. The trans has over 50k miles on it and its been flawless. You know whats in it? Stock replacement allison clutches, a transgo, and 1050 converter. Yep. THATS IT. No main regulator pressure shim, no converter flow valve, no extra clutches, no power packs, no secret squirrel, etc... Everyone laughed at me when I said I was planning on running that mild a trans with an A5k.
I guess Im just lucky when it comes to transmissions.
ben
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GMC_2002_Dmax
The Still Master
Curious to know the person behind the slippers also. Would apreciate a quick pm.... Thanks,Eric
Josh, The 5 speeds and the 6 speeds react differently. I agree, you can not get a LBZ to stop defueling on shifts with the ecm tuning. You sure can with a LLY or LB7.
My own personal race TCM tune has just shift rpm and mph adjusted, that is all. I have tried adjusting everything on my own trucks in the tcm and have gone back to basically stock.
I have had a few customers with converter locking issues, that I have gone deeper into the tcm to try a band-aid, but understood the potential risks. Never have had a problem though.
This is a good thread. As Others have stated, ecm tuning can keep a tranny alive for a long happy life, or put the hurt on it. If the tranny is built correctly and the tuning is right, it's been proven to last a very long time in high HP trucks that get thrashed.
My own personal race TCM tune has just shift rpm and mph adjusted, that is all. I have tried adjusting everything on my own trucks in the tcm and have gone back to basically stock.
I have had a few customers with converter locking issues, that I have gone deeper into the tcm to try a band-aid, but understood the potential risks. Never have had a problem though.
This is a good thread. As Others have stated, ecm tuning can keep a tranny alive for a long happy life, or put the hurt on it. If the tranny is built correctly and the tuning is right, it's been proven to last a very long time in high HP trucks that get thrashed.
Ben, I wasn't accusing your truck of being weak or slow, was just asking. The original poster is trapping 115 and in the mid 11s - even if it's a light truck that's not easy on the trans. For the guys needing a refresh with less power than you (with the exception of ATS guys
) there is either a problem in their trans build or a major problem in their tuning. A truck that is 500-600hp and running 12s on bad trans tuning is going to be alot more forgiving to a trans than a 700+hp truck in the 11s. So you might have a TCM tune that does fine for 100K miles and 300 passes at that power level but will tear up a trans in a few passes at a higher power level. That's the only point I was making.
Dont worry about it, what everyone should worry about is looking at the tables in the TCM and making sure they are stock. I know its fun to blame it all on this "pink slippers" but he is not the only one with potentially dangerous tuning.
opcorn:Pink Slippers LMAO!!! Who came up with the snazzy name?:rofl:
Alot of good info in here guy's!! Reminds me of the old day's!! Thanks!!
Thanks for this info Tony. This explains alot I think most of my problem was with my TCM tuning as table D5196 was way diffrent then stock. The 1800 RPM row was copied and pasted for all the other rows after it. I always had a wierd part throttle shift and could never figure out why. Im not that greatest tuner but im guessing alot of it had to do with this table and it not requesting the proper de-fuel. D5197 was changed on top of that.
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Pink Slippers LMAO!!! Who came up with the snazzy name?:rofl:
Alot of good info in here guy's!! Reminds me of the old day's!! Thanks!!
I think it was Joe at PPE. I have been using it ever since.
Let me ask this then. I changed my desired tq limitting values in my tcm to some what match the ecm allowed tq to rpm limit tables. At wot it still shifts like it did before just nice and crisp. At part throttle it still shifts nice and crisp but the truck seems to excellerate better at a lighter throttle??? Should I change it back to stock as it still defuels betwen shifts like it did before.
Hey guys, I already asked RacingMike, but I'll put a general request out, too. Can someone PM me the FILENAME of the trans tune in question, so I can check my EFI and see if its something I've run/am running in my truck? I DO NOT WANT TO SEE THE TUNE...just the name of it.
Im not a tuning expert (obviously or i wouldnt be where im at) but i would think the easiest way would be to look at table D5196 and compare it to your stock tune trans tune. They should look the same or be close to one another. Also check D5197 and make sure it says "all enabled"