Improving shifts via the ECM

[Boost]

WHen you get to a point with the 6l80s, it will go backwards in feel...lol.

So, I am working on an E39 / T43. I did 10% on the four tables to start, and there was a noticeable difference, though still too sloppy. Then I tried 15% and I almost feel like it got worse?

[Protec]

So, I am working on an E39 / T43. I did 10% on the four tables to start, and there was a noticeable difference, though still too sloppy. Then I tried 15% and I almost feel like it got worse?

I ended at 10% but needed to just decrease the shift times a bit and increase the pressure on the 1-2 and 2-3... I had to experiment, but in this application which was a truck, just increasing the tables was not enough to provide the desired results.

Seems you need to work a few things in tandem... Nothing is easy and direct with these things...


Hope this helps... Again, just my experience..


John

[Boost]

I hear that. Thank you John!

[GMPX]

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.

[GMPX]

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.

[Rhino79]

Oh man this is great news!

[wesam]

With VVT, do we just do the increase on all 4 tables with regard to RPM_Airflow?

Thanks,

John

Any body know the answer for this question ?
Do we need to change all 4 tables with VVT cars ?

[Rhino79]

Yes change them all, my cam is vvt in my car and it helped changing all 4 airflow tables

[APS Luis]

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.

Hmmm - may explain the high trans failures on blown cars running around 12deg ign timing

[GMPX]

Good point Luis, all the more reason for us to get them displayed so you can change the spark coeffs to match.