LMM Tune help - will pay

[sawyer.stclair]

I took an online course to get a base understanding of common rail diesel tuning. I completed it and am trying to configure a base file for my 08 lmm and trying to simply follow the guidlines of what was done to this base file as an example in my course as it is my first time and i would kind of get used to sorting through and editing the tables. The one thing I cant figure out is the fueling. The truck that the base file is from in this video is an lb7 so it has a throttle body and doesn't use the torque based fueling like the llys, lbzs, and lmm. I understand the main injection pulse and the pilot injection events and such, I just cant quite figure out the tables to look at when it comes to the max fuel rate pushed through the cp3. for the lb7 like in this video the table is called throttle base injection quantity, but I cant figure out what table would produce the same effect for the lmm. If anyone can help that would be great, and if someone can explain it all to me i would be willing to pay you.

thanks in advance

[Omega_5]

Hmmm... No an LB7 is a torque model. They probably used the LB7, since it's the most rudimentary and simple of all the Duramax controllers.
The table(s) you're looking for on the LMM are called "Torque Based Fuel".

[metal&machines]

Hey, in no expert, but do have some insight on the LMM. It is tq base fueling, that is driven by driver demand ie throttle percentage. The stock LMM tables will fuel out to 885ft lbs so virtually any power level less than that has been mapped by GM and all you need to do is call for more torque in the driver wish table. If you do its important to scale the tq in as the factory did. In order to push pass the 885 mark that's a different animal and will require adjustment to the pulse table. I have outlined a flow chat below to help understand order of operation. Hope this is helpful.

Driver demands pedal %
Torque call based on %
Torque base fuel map looks up fuel quantity to be delivered
Quantity of fuel is calculated from pulse table, based on fuel pressure and injector on time.