When a transmission is designed to have it for proper function it's a necessity not a feature.
Disabling adaptive shift learning
- Thread starter mike diesel
- Start date
When a transmission is designed to have it for proper function it's a necessity not a feature.
Try that one out and let us know how it goes. I can see either fired clutches, or twisted shafts in your future. You NEED to UNDERSTAND how the ALLISON works, then you would understand how ridiculous this statement is. A CTC trans MUST have adaptive learning so that it knows how much fluid to put to each clutch to fill it to enagagement, or at what TAP the clutch pack engages and disengages at to avoid the infamous tie ups, and shift timing to know just how closely it can apply one, and release the next clutch pack. If you said it didn't need to adapt to driving style, sure that would be a valid observation, but ALLISON put that in there, and from what we have available to us it is either all or none. And your comparison between a DURAFLITE 47RE/48RE is apples to oranges. Your comparing a direct all tied togetehr trans liek the ALLISON to an old school trans with one way clutches, bands, and such so that tie ups just arent an issue.
As to what other trannies use adaptive learning, GM has been using it since at least teh early 90's on pretty much every electronically shifted auto trans they've had. 4L60E's, 4L80E's, and all the rest. DODGE has been using it to a much lesser degree on many of there trannies going back to at least the mid 90's in truck type RWD trannies, as well as all the rest. Adaptive learning isn't needed in EVERY trans out there with it, but with a clutch to clutch trans like the ALLISON, it is a REQUIREMENT. This is wy PCS doesn't offer a conversion system for the ALLISON, there controller wasn't capable of the adaptive learning needed for the ALLISON to work, and eneded with some serious damage to several trannies that tried them out.
Freezing the adapts also freezes the pressure. I don't know how the tables work in EFI but when the TAPs are frozn the TCC is also frozen off.
The other problem would be that when you reflash the trans to deactivate the learning feature, the TAP cells are reset back to the base TAP values. You would never be able to get your transmission to shift right and then disable it because as soon as you flash the TCM to disable adaptive learning, you start back over at zero.
Okay may be a dumb question. But why isnt there a way to make an Allison think (through tuning) that it is getting beat on constantly and it needs to apply max pressures at all times? Like a way to trick the adaptive learning into thinking the truck is being driven at or near WOT at all times even when driven easliy? I would "assume" alot of the damage occures when the trucks come from standard street driveing and then are put to the track or sled pull with the trans in easy driver mode?
That's what I was wanting to get at. But all you'll hear is only use tow haul or a spare ecm for that. I would want it to think that too, that's why I was all for freezing the learning.. Until josh posted it would revert back to base
Kinda like a trans with no defuel won't last more then a 10k miles either 
I would like to see a way to keep the adaptive froze in like wot mode so we had max pressure I wouldn't mind hard shifts just putting around but having it always changing because I don't drive like asshole 99% of the time gets old
I would like to see a way to keep the adaptive froze in like wot mode so we had max pressure I wouldn't mind hard shifts just putting around but having it always changing because I don't drive like asshole 99% of the time gets old
I know that at least on an 01, you can do a cal flash without losing the TAPS. And the adaptive feature can be turned off with a cal flash. I haven't ever tried shutting off the adaptives, but I know I've made shift point changes without losing the TAPS.
I've never understood why people complain about shifting problems going from regular street driving to the track. Maybe I beat on my poor truck too much, but I've never had a problem with it shifting poorly at the track because I've been daily driving it. The Allison has TAP cells for multiple throttle positions so it shouldn't adjust the full throttle shifts any regardless of how easy you drive it. The only time I've had a problem with shifting is if I change tunes and it fuels differently at part throttle or has a ton more power.
If you pull the current tune in the tcm, change it and flash it back in, you shouldnt loose your TAPs. Steve has done that a few times for me and never had to let it learn.
the only time i had issues with shifting at WOT from babying it around was on bad tuning for defuel and the fueling ramp rate or when my converter was not locking when it was suppose to. after all that has been fixed, it drives like a stock truck does
the only time i had issues with shifting at WOT from babying it around was on bad tuning for defuel and the fueling ramp rate or when my converter was not locking when it was suppose to. after all that has been fixed, it drives like a stock truck does
Thanks for the discussion after the smartass comments. I was just curious why and "just because" wasn't a sufficient answer.
I agreeThanks for the discussion after the smartass comments. I was just curious why and "just because" wasn't a sufficient answer.
Thanks for the discussion after the smartass comments. I was just curious why and "just because" wasn't a sufficient answer.
Some know it alls just like to be assholes
I've never had issue either. I putt around 99% of the time and probably go full throttle about once every two weeks. I do putt around on my race tune though. When I go to the track and make a few dozen passes my trans shifts like it should. Only time I've ever had bad shifts was when I went up to a higher level of power, never a problem dropping to a lower level.
Only time i have limped ever is from transition from street driving to track or getting pissed in traffic and going flat out or somthing. Now i know my trans isnt built but its still an allison.
And this can be dismissed by some of you if yall want, but i thi k its worth discussing why we cant fool the adaptive learning or one of the ace tuning electronic gurus here can come up with somthing.
Is there a closed loop system the tcm uses at all? Im "assuming" limp is a closed loop? But is there a way to keep the trans in a closed loop of aggressive driving? And for the guys just dismissing this and say "well its never happened to me" or "its shit tuning causing this". You could be correct yall are alot smarter than me. But my question to you is you dont think the trans will benefit from more aggressive shifting and more pressure? Our shafts are pretty tuff i would "think" they can survive a little harder shifts.
Im fine with hard shift ls my turbo 400 and 700r's would snap you neck every shift with the higher horse trucks
And this can be dismissed by some of you if yall want, but i thi k its worth discussing why we cant fool the adaptive learning or one of the ace tuning electronic gurus here can come up with somthing.
Is there a closed loop system the tcm uses at all? Im "assuming" limp is a closed loop? But is there a way to keep the trans in a closed loop of aggressive driving? And for the guys just dismissing this and say "well its never happened to me" or "its shit tuning causing this". You could be correct yall are alot smarter than me. But my question to you is you dont think the trans will benefit from more aggressive shifting and more pressure? Our shafts are pretty tuff i would "think" they can survive a little harder shifts.
Im fine with hard shift ls my turbo 400 and 700r's would snap you neck every shift with the higher horse trucks
An Allison shouldnt ever have a hard shift like you would have in other trans'. It will only shift so fast before you start to get shift tie ups.
Sorry i worded that poorly. (Damn kansas schooling). Im not after the neck snapping shifts im just saying im ok with it as it would never be as bad as my th trucks
Im by NO means even on the same playing field that some of you are with the allison, all i have ever done is drop valve bodies for jr kits. The adaptive learning is something i have wondered since 07 if it could be fooled.
It doesn't matter if you are ok with it. A hard/firm shift in an allison is a tie up and will cause carnage or extreme accelerated wear.