Improving shifts via the ECM

[samh_08]

Is there any reason to change/not change the torque models on a stock engine / trans?

[Y BE AVG]

anything new happening with this.

[ScarabEpic22]

anything new happening with this.

What do you mean? It works, very well in fact...

[Y BE AVG]

Sorry, this is what I was asking about. Trying to keep up to date. But you're right the torque models fixed a lot of problems we deal with on a daily basis.

I should let you all know that there is a pretty major change to these torque table configurations coming which will mean if you have been scripting changes you will have to start again, the table configurations are changing.
I will shortly be in NZ working along side Paul on a few projects, one of them will be to plot the torque maps similar to how we do the Virtual VE's. However, at least for this trip there is no possibility of adding in the reverse calculations.
But the plan is what we can offer is a 3D plot of what the calculations will produce. We did some logging on Paul's car today (6.0L L98) and based on the numbers it was amazingly accurate.
So as another test I set up the calculation in Excel and punched in the numbers to match the L98's peak torque figure at 4,400 RPM from those in the torque model tables. I assumed a couple of things, timing (23 deg) airflow (860mg).
The L98's rated torque at 4,400RPM is 530Nm, the calculation produced 532Nm! If I dropped the timing back to 10deg it calculated out 436, upped it to a knock producing 30deg it only went up to 548Nm.
It's really fascinating playing around with the numbers and seeing the results, should be a lot of fun once it's implemented, but for the new ECM's (E39, E78 etc) pretty important.

It will be very tricky with the variable cam engines, it may take a few software revisions to get the operational side of this ideal based on everyone's feedback.

[Boost]

On the V6 it might be a little tricky because you have the cam phasing to deal with too, each column is very different, unfortunately just adding percentages on the E39 doesn't always work. The other thing is these tables on the E39 will change the throttle response.

So I am working on my E39A / T76 combo and it has variable intake and exhaust cams. Where can I read up on how exactly it affects throttle response and how to get it dialed in? I would LOVE to get it shifting like it did on my E78 Cruze (really good)!

[wesam]

I noticed something weird while tuning GMC Sierra 2500HD 2013
when increasing the tables in torque model by any value it will limit the TB opening while WOT to 61%
I'm logging ETCT and it was fine before adding to the Torque model
Any thoughts ?

[ScarabEpic22]

I noticed something weird while tuning GMC Sierra 2500HD 2013
when increasing the tables in torque model by any value it will limit the TB opening while WOT to 61%
I'm logging ETCT and it was fine before adding to the Torque model
Any thoughts ?

What ECM, E78? Have you raised the TQ limits? Remember the newer ECMs try to meet the desired TQ value, if they hit it then they will limit throttle, boost, and so on. If you've raised the torque model to match that of the engine, you need to make sure the TQ limits are above that otherwise it will act as a "master" limiter.

[wesam]

Yes E78 ECM
And yes I raised all torque limits in ECM
but dis not raise the torque limits in TCM
what tables in E78 do you suggest to raise ?

[ScarabEpic22]

You'd have to post both files for me to check, but I know in the E78 you should look at B8801-B8804, B8300-B8303, B7017. However, it appears that not all the TQ tables are there, HPT has a few more TQ related tables that might be coming into play.

Try modifying the TCM as well, the TCM might be asking the ECM to limit power if it's limits are being met.

[wesam]

You'd have to post both files for me to check, but I know in the E78 you should look at B8801-B8804, B8300-B8303, B7017. However, it appears that not all the TQ tables are there, HPT has a few more TQ related tables that might be coming into play.

Try modifying the TCM as well, the TCM might be asking the ECM to limit power if it's limits are being met.

All those tables are set to Max but it seems there is tables not mapped yet in EFI Live for the E78
I hope to get more support for this ECM soon