Question: What are taps?

[Osubeaver]

I know in a practical sense that they have to do with adaptive shifting in the Allison. You should clear them and relearn them when making big ECM tune changes, etc.

But what are they? Does taps stand for something? Are they just some values in the TCM somewhere?

Anybody have a picture of an Allison tap? :joker:

 

[Mike L.]

Target Applied Pressures.
The TCM is programed to look for the perfect shift which is 7 tenths of a second. It constantly moniters the shifts and trims ( adjusts ) accordingly to achieve this shift.
When you change an engine tune the TAP is set for what you were running before the change because it has no way of knowing what you did. So now the trans will either shift with a slip if you changed to a bigger program or a harsh shift and down shift if you installed a lower program. It will eventually adapt with stop and go driving.

 

[Osubeaver]

Thanks Mike.

 

[Leadfoot]

Mike thanks for the explanation.

Question:

I know we can reset taps, but do we have the ability to look at the values or set them?

The reason I ask is many of us only run a couple of tunes (one of them being stock). When I go from a pulling tune to stock tune it's not a big deal, but going from stock to pulling tune (I run stock 95%) of the time, you can tell the tranny takes a little to adjust (which I'm sure is not good/ideal for it).

If we ran a pull tune for a reasonable amount of time and the transmission has "learned" we could read the values and plug those values in each time we ran that particular tune. My thinking is that it would keep the learning process to a bare minimum and save any slippage/damage that may occur during normal "learning" by switching from a stock to pulling/racing tune.....


Am I way out in left field here? Also I have EFI Live but am illiterate and have not tried talking to the Allison yet.

Target Applied Pressures.
The TCM is programed to look for the perfect shift which is 7 tenths of a second. It constantly moniters the shifts and trims ( adjusts ) accordingly to achieve this shift.
When you change an engine tune the TAP is set for what you were running before the change because it has no way of knowing what you did. So now the trans will either shift with a slip if you changed to a bigger program or a harsh shift and down shift if you installed a lower program. It will eventually adapt with stop and go driving.

 

[Mike L.]

Mike thanks for the explanation.

Question:

I know we can reset taps, but do we have the ability to look at the values or set them?

The reason I ask is many of us only run a couple of tunes (one of them being stock). When I go from a pulling tune to stock tune it's not a big deal, but going from stock to pulling tune (I run stock 95%) of the time, you can tell the tranny takes a little to adjust (which I'm sure is not good/ideal for it).

If we ran a pull tune for a reasonable amount of time and the transmission has "learned" we could read the values and plug those values in each time we ran that particular tune. My thinking is that it would keep the learning process to a bare minimum and save any slippage/damage that may occur during normal "learning" by switching from a stock to pulling/racing tune.....


Am I way out in left field here? Also I have EFI Live but am illiterate and have not tried talking to the Allison yet.

There is a way to do what you want; sort of. Guy Tripp would be the person to ask. I am just starting to get my feet wet with EFI.

 

[Osubeaver]

You read my mind Leadfoot.....

 

[Cougar281]

I would THINK that if you do a read of the TCM once it's "Happy" with the pulling tune, if you flash it back without clearing TAPS during the flash (default does not clear them on flash), you'd get the TAPs that where in the TCM when you read it. If the TAPs are not in the "Cal flash" area on the 06+ TCM, then it may not be possible; 01-05 a full flash would do it if a cal flash wouldn't.

 

[SIKDMAX]

There is a way to do what you want; sort of. Guy Tripp would be the person to ask. I am just starting to get my feet wet with EFI.

:cool2::cool2::rockon: Glad you are Mike, was cool to see you at the class.


I dont remember off hand how to view the values, but yes you can, Ill post up when I get to a computer at home with EFI on it.

Basically you can get the trans shifting very good, view the TAP values, save them in excel, then reload them when you put new tunes in or whatever so it shifts exactly how you want.

 

[Cougar281]

Connect to the TCM, click "Calibration", and "Allison Transmission adaptive shift cells", or "Shift + CTRL + F4". That'll let you read them (doesn't seem to work on 06 TCM; locks up the tool and kills comms with the TCM), but how would you write them back?

 

[Leadfoot]

Connect to the TCM, click "Calibration", and "Allison Transmission adaptive shift cells", or "Shift + CTRL + F4". That'll let you read them (doesn't seem to work on 06 TCM; locks up the tool and kills comms with the TCM), but how would you write them back?

That figures, I have an 06 (just my luck).