Improving shifts via the ECM

[Boost]

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

This is precisely why I need support for my T76 please please please. I have a passenger in my race car that says "slow down, slow down" (TCM)

[cindy@efilive]

This is precisely why I need support for my T76 please please please. I have a passenger in my race car that says "slow down, slow down" (TCM)

Additional TCM support (T76, T43) isn't even on our radar until at least after the first quarter of 2014 sorry. Too many other projects sit ahead of them in the development list.

Cheers
Cindy

[Boost]

Bummer. I'll just have to hope time flies until then. I really need it and can't wait. But thanks for the update and I'll be hoping for the best!

[sb1111]

Hi I am looking for someone who knows what the table needs to look like to work right with 6L90 and e 38 controller.

[GMPX]

Trial and error I'm afraid, log the torque PID from the ECM to make sure your changes are going in the right direction. Re-read this thread (I know it's very long) but there is a lot of discussions in this thread from people trying to tweak the torque tables.
If you are still a little lost then maybe give a some more details on the engine combo, what has been done, how is the trans behaving.

[sb1111]

its gm 6 liter and 6L90 transmission
when going uphill when you press the gas the vehicle is running like reving but the transmission is not shifting until you release the foot off the pedal
I don't know if this would cause any transmission to burn the clutches or stuff like that

[joecar]

If the trans is slipping then there is an internal hydraulic/mechanical problem.


Otherwise the shift tables must obey relative relationships (if they don't then they may be inhibiting particular shifts)...

for example, the 3->4 upshift table must be above the 4->3 downshift table (by at least a few MPH), and must also obey the engine RPM limit.


Not shifting due to hitting the engine RPM limit should not cause trans problems, but may sometimes cause engine valvetrain problems (depending on situation).

[Tre-Cool]

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.

GMPX, was there any updates on this spreadsheet or calculation to the program? Or could you run some numbers in it for me for the e83 controller?

Cheers

[GMPX]

GMPX, was there any updates on this spreadsheet or calculation to the program? Or could you run some numbers in it for me for the e83 controller?

Cheers

The answers are No, No and No

Spreadsheet hasn't been touched.
The calculation program is not going in to V7.5, it will be in V8.
Sorry, don't have time to do the numbers for you.

[APS Luis]