bubba68ss
November 20th, 2018, 04:07 PM
I FINALLY got my wideband installed in my '02 5.3 with 4l60e. The only mods I have are a cold air intake. It runs great but I'm just trying to teach myself basic tuning.
There was a spot under light throttle where I noticed my LTFT's were in the positive teens (17-18ish) but at idle they were great. So I figured I'd try to correct the VE table and MAF. (*I checked fuel pressure and other things first)
I got all the tables set up, maps, PID's etc. I also got my wideband serial connection to work (PID showing AFR like the gauge, LAMBDA and EQ also). I went for a nice long log and built a new VE table (copy paste with labels, right?) and the MAF (multiply?). Everything seemed like it all made sense because the maf range correction was about 12-13% off. The VE table was about 20-30% off in respective tables though...
Then I got to thinking did I set up everything right? Do I have to modify a file somewhere to specify my LC-2 WB? Is that calculation reading off something else like LTFTs or something and making a false correction because today i noticed my fuel trims were almost the opposite---negative. still good at idle (-4 to 0)
I did have to use Scan and Tune to program my V2 to get the WB to work... but that's the only place I specified what I had...
There was a spot under light throttle where I noticed my LTFT's were in the positive teens (17-18ish) but at idle they were great. So I figured I'd try to correct the VE table and MAF. (*I checked fuel pressure and other things first)
I got all the tables set up, maps, PID's etc. I also got my wideband serial connection to work (PID showing AFR like the gauge, LAMBDA and EQ also). I went for a nice long log and built a new VE table (copy paste with labels, right?) and the MAF (multiply?). Everything seemed like it all made sense because the maf range correction was about 12-13% off. The VE table was about 20-30% off in respective tables though...
Then I got to thinking did I set up everything right? Do I have to modify a file somewhere to specify my LC-2 WB? Is that calculation reading off something else like LTFTs or something and making a false correction because today i noticed my fuel trims were almost the opposite---negative. still good at idle (-4 to 0)
I did have to use Scan and Tune to program my V2 to get the WB to work... but that's the only place I specified what I had...