Improving shifts via the ECM

[Rhino79]

Thanks so much ross. And for what its worth, the torque tables work great on e38/t42 combos as well!!!

[ScarabEpic22]

Thanks so much ross. And for what its worth, the torque tables work great on e38/t42 combos as well!!!

Interesting...going to have to play with that on my E67/T42 TBSS soon then! Working on a few other tricks for it now (running a car TCM OS so the TCC doesnt unlock when letting off the gas, simply using the car OS instead of the stock one netted me a +1mpg on a 650mi round trip) and just got my efans installed.

Should I try blanket adding like +10% to the torque tables and seeing how the trans shifts?

[GMPX]

Should I try blanket adding like +10% to the torque tables and seeing how the trans shifts?

Yes, just do the ones mentioned in the thread (there is lots of them), see how it feels at 10%.

[ScarabEpic22]

Yes, just do the ones mentioned in the thread (there is lots of them), see how it feels at 10%.

Cool, Ill start there. Gotta get a few other things done first then try this, cant try too many things at once or I have no idea what actually helped!

[Tre-Cool]

so has anyone else played around with b3001 - b3003 yet?

I have increased mine but I havent done any wot runs, just along with the existing 15% increase in the other torque model table shifts are pretty firm at mid to high throttle. which is what i expected having only adjusted the 40-100% table.

Absolute Difference

New Configuration

Original Configuration

[redhardsupra]

I'd prefer to know how the torque estimation happens, or at least what variables are involved.

[600+duramax]

Is the 0 degree table the only one that has to be modified? Or do I also have to do the 10 20 and 30 degree tables and if so what is the difference in the tables.

[scottcmb]

I could be wrong on this but my thoughts are at this stage is that the 0 degree table is the only table used by fixed position cammed engines.
And the VVT engines use all 4 tables.

Hence if your engine is fitted with AFM and when that engine goes into AFM mode it will refer to the AFM tables in the Torque model

Cheers Scotty

[Redline Motorsports]

I am trying to get a sanity check about the following theory...

Since the MAF and VE (coefficients) are what determine the "load" is it safe to say that a modified engine measuring 94 lbs/min of airflow vs. say 55 stock....hits a wall in what it can actually report for final load....therefore since the trans is "torque based" if load is reported as less when output is high....clamping force and shift times will not be adequate to properly perform the shift.


We have a 2012 6L90 trans we are pushing some big power through and we are having a hard time at the track getting strong positive shifts....trans feels like its slipping through the 1 to 2 shift killing ET...


Also does this new torque model table compound the reduction of TM?


Howard

[GMPX]

....therefore since the trans is "torque based" if load is reported as less when output is high....clamping force and shift times will not be adequate to properly perform the shift.

That is spot on and the very reason these tables were added. For the TCM to do it's thing correctly it needs to be given the right data to work with (the torque figure).

Also does this new torque model table compound the reduction of TM?

I expect it would, if the TCM wants the shift to happen with 200 ft-lb of engine torque and the modified torque model is saying the engine is well over 700 then it will want more TM to happen to get the figure down. Having said that, the results being posted in here would indicate that doesn't seem to happen because the trans shifts nice and firm with the higher values in the Torque Model.