Its the way the pedal position to desired torque/torque based fuel/main injection pulse are working together.
You have to make sure that the three are happy or it will lay over.
It has zero to do with the tcm tuning.
Its the way the pedal position to desired torque/torque based fuel/main injection pulse are working together.
You have to make sure that the three are happy or it will lay over.
It has zero to do with the tcm tuning.
[/SIGPIC]
2005 duramax LLY, 12.75 on stock motor/fuel, 68mm vgt built trans.
Built motor by me, built trans, EFIlive by me, dual fuelers, 80% injectors.
LLY/LB7 do as you tell them to, LBZ isn't to bad, but LMM's keep you guessing. With an LMM you can write the tune to do what you want, but it always seems to take on a mind of it's own because of some obscure limiter or multiplier you overlook or don't think would apply until you log it. And a tune that works in one won't neccesarily work in another.
1995 GMC 2500 SUBURBAN powered by 01 DURAMAX/ALLISON, little of this, a little of that,
DIAMONDEYE 4" exhaust, CORSA muffler, AFE stage 1 dry filter, custom tuning by me, KENNEDY single pump and pump rub kit.
FWIW,
From the best I can tell in the logs, there exist algorithms in both the 5 speed and 6 speed controllers that dynamically adjust the defuel based on how well the trans is meeting it's desired shift time. These algorithms become more evident as you increase torque at lower throttle inputs, presumeably because the trans doesn't have the line pressure to properly execute the shift a the higher torque load.
In the 5 speed, defuel can be axed completely via table D5197 in the TCM. People will throw rocks at if you do it, but maybe that doesn't bother you.
In the 6 speed, the shift defuel cannot be disabled completely with the current .calz offering. It can be lessened and made to appear more or less seamless via fuel curve tuning, but it cannot be disabled completely in the TCM (which is where the shift torque limit request originates).
Nick
One of MANY many threads...Prefer not to let this one die. We have all been waiting for defuel adjustment in the A40 for 5 years. A pretty serious omission where tuning effectiveness is concerned. Will this problem get some acknowledgment before the A50/LML project?
Michael, Systems Engineer 04.5 D-max LLY, Phoenix, Arizona Email
Custom Tuning Services
DURAMAX/CUMMINS ECM's TCM's for sale, all years, 20% wholesale discount available
EFILive's first VGT "Software Wastegate Tune"
I have not had any issues with tuning the ecm properly to limit the defuel to an acceptable level, in fact I can get it so that it pulls only a small amount of fuel on the shift all thru ecm tuning only
Yes, of course you can.
Michael, Systems Engineer 04.5 D-max LLY, Phoenix, Arizona Email
Custom Tuning Services
DURAMAX/CUMMINS ECM's TCM's for sale, all years, 20% wholesale discount available
EFILive's first VGT "Software Wastegate Tune"
All the duramax models have to have properly written ecm tuning because if they are not written correctly they will defuel too much or not enough.
The LBZ and LMM use a different method to achieve the same results as the 2001-2004.5 models.
It will take some creativity and dedication to figure it all out, there is a way to do it.
11.80...stock air/fuel no drugs, 5600lbs...
Guess what tcm tune? ...Stock
Guess what defuel values? ...Stock
From the factory they shift great... So go one table at a time and when you finally mod a certain table that throws your tcm out of whack, return that table to stock.. Start over.. And write down what does and doesn't work.
At the end of the day you end up with tons of knowledge and a well tuned truck.
Kory