what changes can be made in the tcm using efilive?

Shift points based on rpm and mph. Converter locking and unlocking as well as some of the pressure controls.

Download the software and take a look.

While you can adjust a handful of variables in the TCM through the use of EFI Live. I would make pretty darn sure I knew exactly what I was doing before taking these adjustments out on the street. One false move and some serious damage can be done.

thanks for the information. is there any way to know if my tcm has been programmed? i'm not used to automatics much always had manual tranmissons before. this is the only duramax allison i have driven and i bought this one used. the previous owner had done some mods to truck but took them all off when he traded it in. the shifting is strange and it will go into overdrive and lock up tcc at around 43mph and 52mph when you accelerate heavily on throttle.

You could take it to the dealer and have the TAPS reset.

Not to hijack, but are the shift tables for T/H mode completely separate from normal mode? I.e., does what you do to T/H mode settings have an effect on the shift characteristics while not in T/H (do the tables "talk" to each other)? I just don't know exactly how the tables are set up.

the shifting is strange and it will go into overdrive and lock up tcc at around 43mph and 52mph when you accelerate heavily on throttle.

Thats the way an Allison is supposed to be. Resetting the TAPS will NOT change shift points or lockup characteristics.

yes, tow/haul has completely different shift and converter lockup maps.

i have messed with everything on it minus the TAP cells currently my adaptive learning is disabled...... my shift time is 400mS which fill firm due to the tranny slipping

you have 4 setting in the tranny
normal
t/h
4 lo
hot tranny ie above 260*iirc

cunvert everything to imperrial and the speed form Kmph to mph amde it a lot easier to under stand everything

i have messed with everything on it minus the TAP cells currently my adaptive learning is disabled..

I would not reccomend doing this.......

just my oppinion.

I would not reccomend doing this.......

just my oppinion.

It's going to change.:D

do tell Mike? :D :secret:

yeah that comment definitely perked my interest also.

:agreed:

You have my attention :D

I would not reccomend doing this.......

just my oppinion.
re- read that ben.... have messed with everything on it minus the TAP cells currently my adaptive learning is disabled..

i adjusted the shift times and point along with ttc lock up/release and shift speeds
and i have turned the adaptive learning off....if i want 1000mS shift time i get 1000mS shift time with adaptive learning the TCM can increase/decrease that number by as much as 1000mS. my adaptive tables are set at 0mS or i can go to the D5054/D5053 the adaptive kickdown and upshift and enable/disable them

the TAP cells are STOCK callibration

Shift time is not an adaptive feature...

pray tell me what D5102 D5100 and the following are?????


because this is what efi says

Referencing the throttle position, this table will alter the final desired shift completion time defined by {D5080} "Base Desired 1->2 Shift Time" for a normal 1->2 shift.
For example, assume the single 'Base' desired shift time is 500mS.
In this table you might see values ranging from 200ms to -200ms.
In these cases the final desired shift time the adaptive learning aims for would become 700mS to -700mS as this table alters the single base value.

Ok.. I will tell you..

Those are modifiers..

Base shift time is 500ms..

Shift timing is delayed (up to 200ms) at low throttle regions and can be accelerated (up to -200ms) at high throttle..

Drag out the low throttle shifts, and quicken the high throttle shifts..

The adaptives will create the correct pressures to follow the desired shift time plus any modifiers.. which yield the ACTUAL SHIFT TIME

Go try it and watch your TAPS

If you look around in EFILive there are many occurances of this.. Look at all the modifiers in the engine tuning.. Many variables are modified by ECT and by throttle.. Sometimes more than once.. It makes your brain turn to tapioca...

That's why it's important to log after a change to see if you've missed something.. like a modifier.

Hope that helps

Brayden you and Tom sound alike. All sounds like chinese to me):h

Ok.. I will tell you..

Those are modifiers..

Base shift time is 500ms..

Shift timing is delayed (up to 200ms) at low throttle regions and can be accelerated (up to -200ms) at high throttle..

Drag out the low throttle shifts, and quicken the high throttle shifts..

The adaptives will create the correct pressures to follow the desired shift time plus any modifiers.. which yield the ACTUAL SHIFT TIME

Go try it and watch your TAPS

If you look around in EFILive there are many occurances of this.. Look at all the modifiers in the engine tuning.. Many variables are modified by ECT and by throttle.. Sometimes more than once.. It makes your brain turn to tapioca...

That's why it's important to log after a change to see if you've missed something.. like a modifier.

Hope that helps


if i understand this all i have done is taken the ability to quick/drag out the shift times by the computor away..........

but the TCM's is still alowed to adjust the Tap cells correct?

If you shut off the adaptives in theory the TAP cells shouldn't adjust...

Think of the clutchpack like a bicycle wheel that you have your hand around.. If you want to stop it in 200ms you'll have to use a lot of pressure quickly to stop it.. If you want to stop it gradually in 2000ms then you'll use less force. If you turn the adaptive feature off I'd think that you took away it's ability to learn how hard to stop the wheel and it may or may not be able to stop it in the time that you are asking it to.

I'd leave that stuff alone.. Shift timing can be a good adjustment, but don't go too low since the Allison is a clutch to clutch trans... unlike the hydramatics which feature overrunning clutches..You can set them to 0ms and they'll shift as fast as mechanically possible.

You set an Allison to 0ms and it might be holding on to one too many clutches at once.. and.... well you get it ;)

If you shut off the adaptives in theory the TAP cells shouldn't adjust...

Think of the clutchpack like a bicycle wheel that you have your hand around.. If you want to stop it in 200ms you'll have to use a lot of pressure quickly to stop it.. If you want to stop it gradually in 2000ms then you'll use less force. If you turn the adaptive feature off I'd think that you took away it's ability to learn how hard to stop the wheel and it may or may not be able to stop it in the time that you are asking it to.

I'd leave that stuff alone.. Shift timing can be a good adjustment, but don't go too low since the Allison is a clutch to clutch trans... unlike the hydramatics which feature overrunning clutches..You can set them to 0ms and they'll shift as fast as mechanically possible.

You set an Allison to 0ms and it might be holding on to one too many clutches at once.. and.... well you get it ;)


the base shift time is only 400mS and it feel firm not harsh......might be due to the fact thst i might be slipping it.:rolleyes: ... when the SC4 get install next week... i will go back to the stock shift times that are around 650mS and adjust from there as need


i agree with you about the TAP cells 100%

It all makes sense even to a stupid tuner/transmission builder like me ;

hard shifts are NOT what you want on an ally.......

hard shifts are NOT what you want on an ally.......

:exactly:

reading this is why I think I'd rather just get the PPE Programmer instead of EFI Live. I like tinkering and experimenting....but I'm afraid of damaging stuff finding out what works and what doesn't. Are there any guides out there as to what are some safe ranges for settings? I'm not that familiar w/ EFI Live...but as I read more about it, I'm thinking more about it.

reading this is why I think I'd rather just get the PPE Programmer instead of EFI Live. I like tinkering and experimenting....but I'm afraid of damaging stuff finding out what works and what doesn't. Are there any guides out there as to what are some safe ranges for settings? I'm not that familiar w/ EFI Live...but as I read more about it, I'm thinking more about it.
The only trans tuning I've done is adjusting shift points. My trans shifts fine with both an '01 OS and an '04 OS. I think most applications the trans will behave with proper ECM tuning. Also not everyone wants the same thing from their trans. TJMHO.