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LS3 with small cam. 218/226. Local dyno tune with hp tuners and wide band. Still feel like it’s running rich. High negative fuel trims have me worried.
LTFT -17 idle to -22 WOT
TWO ways to adjust: Quick and dirty: simply input HIGHER injector flow rate ( I'd go plus by 2/3 of your LTFT- so basicly multiply injector flow rate by 1.11 or so )
Again, that's quick n dirty, no one said it was right, but it'll get those trims down quick.
The RIGHT, way, which take s more time, is to massage the VE table.
Drive it around, log AFR, and grind that fuel table straight.. Cell by cell - Baby.
NOBODY is going to take DYNO time to do that, unless you are a billionaire.
He did did a few small runs to dial in the base tune then did 2 dyno runs. It was done in about an hour and a half. Trying to communicate with him to street tune and the drive. I feel it’s way rich. Exhaust alone is extremely black.
TWO ways to adjust: Quick and dirty: simply input HIGHER injector flow rate ( I'd go plus by 2/3 of your LTFT- so basicly multiply injector flow rate by 1.11 or so )
Again, that's quick n dirty, no one said it was right, but it'll get those trims down quick.
The RIGHT, way, which take s more time, is to massage the VE table.
Drive it around, log AFR, and grind that fuel table straight.. Cell by cell - Baby.
NOBODY is going to take DYNO time to do that, unless you are a billionaire.
I dont hit every single cell in a ve table but I can hit a good majority of them on the dyno using the eddy brake (load cell) in less than 1/2 the time it takes driving around. Can also hit cells that are really hard to hit by driving around.
I’m worried I may of had a vacuum leak at the valve cover pvc line or at the valley plate line. Not sure if that would have thrown things off. I do get considerable bucking at low speed now. Have about 300 miles on the tune and 100 mines on the 4.10 gears and truetrac.
You said u changed to larger injectors. Was it tuned for these or the older ones? If not thin thts your issue with the richer trims. It needs correct injector data to respond correctly.
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Fuel Trims 
