Improving shifts via the ECM

[madmax4499]

do you highlight the entire table and increase by % or just parts of it.

[Dieselman]

do you highlight the entire table and increase by % or just parts of it.

I highlighted the whole table and increased by 5% at a time until happy with shift quality. I am at 15% currently

[scottcmb]

Just a quick note guys......remember if you increase the torque mod table by 5% increments at a time and say you do it three times, the figures in the cells will not be the same as the figures in the cells of a table that was increased once by 15%. In fact the table done three times at 5% will have higher values than a table done once at 15%....... see snap shots below



its something i thought i should mention because its an equasion that catches people out some times

Cheers Scotty

[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

[joecar]

Just a quick note guys......remember if you increase the torque mod table by 5% increments at a time and say you do it three times, the figures in the cells will not be the same as the figures in the cells of a table that was increased once by 15%. In fact the table done three times at 5% will have higher values than a table done once at 15%....... see snap shots below



its something i thought i should mention because its an equasion that catches people out some times

Cheers Scotty

The 5% is being applied to a successively increasing value vs the 15% one time is applied to the original value...

For example:

15% one time:
100 * 1.15 = 115

5% three times:
100.00 * 1.05 = 105.00
105.00 * 1.05 = 110.25
110.25 * 1.05 = 115.7625

i.e. the two methods are out by a factor of (1.05)^3/1.15 = 1.00663.

Is this what you're seeing...?

[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.

[scottcmb]

The 5% is being applied to a successively increasing value vs the 15% one time is applied to the original value...

For example:

15% one time:
100 * 1.15 = 115

5% three times:
100.00 * 1.05 = 105.00
105.00 * 1.05 = 110.25
110.25 * 1.05 = 115.7625

i.e. the two methods are out by a factor of (1.05)^3/1.15 = 1.00663.

Is this what you're seeing...?

Sorry Joe....i wasnt being clear enough in what i was trying to point out
if you look at cell 0 rpm/ 0.0 cam position it has a value of 6.338196 after and increase of 15% added once on my stock table.
when the same stock table had a 5% increase done at three seperate times ( say if a tuner increased there stock table by 5% then went out and tested it for shift feel then came back in and increased it again another 5% and then went out and tested again so on and so on to a total of 3x 5% increases)
The final value in that same cell will be 6.380221.

so therefore the 3 x 5% increases will be higher in value by 0.042025.

so basically the point im trying to explain is that when tuners tested there trans with 3x5% increases and get the results they wanted. It will not be the same results when they go to do a tune on another vehicle and just add 15% straight off the bat, or if anyone else on here like myself read what has been posted and just go straight to there tune and add 15%.

What Rhino and others have tested and posted there results for all to try is greatly appreciated by myself and im sure others aswell, i just wanted to point out that this little percentage equation can catch some people out with figures, thats all im trying to say.

Cheers Scotty

[Redline Motorsports]

Sorry Joe....i wasnt being clear enough in what i was trying to point out
if you look at cell 0 rpm/ 0.0 cam position it has a value of 6.338196 after and increase of 15% added once on my stock table.
when the same stock table had a 5% increase done at three seperate times ( say if a tuner increased there stock table by 5% then went out and tested it for shift feel then came back in and increased it again another 5% and then went out and tested again so on and so on to a total of 3x 5% increases)
The final value in that same cell will be 6.380221.

so therefore the 3 x 5% increases will be higher in value by 0.042025.

so basically the point im trying to explain is that when tuners tested there trans with 3x5% increases and get the results they wanted. It will not be the same results when they go to do a tune on another vehicle and just add 15% straight off the bat, or if anyone else on here like myself read what has been posted and just go straight to there tune and add 15%.

What Rhino and others have tested and posted there results for all to try is greatly appreciated by myself and im sure others aswell, i just wanted to point out that this little percentage equation can catch some people out with figures, thats all im trying to say.

Cheers Scotty

Best thing would be to write three separate calibrations each multiplied from the stock file and done in 5 percent increments.

Howard