Have a friend that bought a 2007 Chevy with an LBZ. He also installed a CNG tank and got a module setup from Marc Deluca (sp?). I have been messing with the calibration a little bit, but I have a couple questions.
First, he took me for a ride with the "stock" tune. When lugging up a hill, it started rolling smoke pretty bad, and when WOT it never cleared up (this is also when injecting CNG). With the CNG off it still smoked more than a stock truck should, but not bad. I read the stock tune and compared it to a stock file from diesel place and all the tables appeared to be stock. I changed a few little things like timing in the cruise area, opened up the vanes at idle, speed limiter, turned egr off, and added a turbo brake.
I talked to him today at his place, he was having a small drivability issue down low (1400rpm or so) when the cng starts injecting it likes to take off on him. I changed the vane table a little so the turbo doesn't spool up so fast, and lowered the pw all over the table (made it similar to a stock LLY pw table since he has the cng for power) so the throttle wasn't as touchy, and up top he said it ran hot (1500F or so). These things helped the smoke output up top, still has plenty of power, but @50mph with the converter locked up it likes to roll smoke. Also when warmed up, it started to lope at an idle when in P/N, NOT in gear. I thought about changing the converter lockup/shift points but Ive never done this, where in the tune file is it? Do I need to read the TCM file along with the ECM?
Any insight you guys have at all would help. Sorry about the long read, and this will probably be a long process getting it figured out, our schedules only match up every other week or so.
Thanks in advance :thumb:
Jesse
First, he took me for a ride with the "stock" tune. When lugging up a hill, it started rolling smoke pretty bad, and when WOT it never cleared up (this is also when injecting CNG). With the CNG off it still smoked more than a stock truck should, but not bad. I read the stock tune and compared it to a stock file from diesel place and all the tables appeared to be stock. I changed a few little things like timing in the cruise area, opened up the vanes at idle, speed limiter, turned egr off, and added a turbo brake.
I talked to him today at his place, he was having a small drivability issue down low (1400rpm or so) when the cng starts injecting it likes to take off on him. I changed the vane table a little so the turbo doesn't spool up so fast, and lowered the pw all over the table (made it similar to a stock LLY pw table since he has the cng for power) so the throttle wasn't as touchy, and up top he said it ran hot (1500F or so). These things helped the smoke output up top, still has plenty of power, but @50mph with the converter locked up it likes to roll smoke. Also when warmed up, it started to lope at an idle when in P/N, NOT in gear. I thought about changing the converter lockup/shift points but Ive never done this, where in the tune file is it? Do I need to read the TCM file along with the ECM?
Any insight you guys have at all would help. Sorry about the long read, and this will probably be a long process getting it figured out, our schedules only match up every other week or so.
Thanks in advance :thumb:
Jesse
