Did I do calc.vet right?

[bubba68ss]

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...

[bubba68ss]

only tune changes i made beforehand were to disable cat protection and set maf enable to 400rpm

[joecar]

Please post before and after tune files, and log file.

[bubba68ss]

Here they are. before, after and log 1 and log 2 (idle)



2002 5.3 os 12212156 before.ctz

2002 5.3 os 12212156 AFTER.ctz

real log 001 11-18.efi

real log 001 11-18 idle.efi

[statesman]

Where did you get your injector data?

[bubba68ss]

It is a stock 2002 5.3 with flex fuel injectors (33 lb). Just noticed I uploaded the wrong BEFORE file. I’ll fix that

[joecar]

ok.

Also post the stock file, please.

[bubba68ss]

I've uploaded the right before file.

I only have the stock file in .cal format (TC) which I modified to standalone operation in RT Tuner a year ago, flashed in my PCM, read with efilive ('before' file), flashed into my licensed pcm, and then modified from the calc.vet process ('after' file). I don't see a .ctz L59 file in the dropbox to upload for comparison but the only difference is vats off and emissions/code deletes

[statesman]

It runs great but I'm just trying to teach myself basic tuning.

After looking at your log... I'm guessing that you've never driven a well tuned LS1.

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.

Yep, I noticed trims actually go to around +24 near the end of your log... it can't run great with trims like that, unless you've done a few hundred miles on the tune and the PCM has had time to 'bake in' those crazy trims.

It is a stock 2002 5.3 with flex fuel injectors (33 lb). Just noticed I uploaded the wrong BEFORE file. I’ll fix that

Your MAF airflow readings look too high for a 5.3 engine, which makes me think that your injector data is wrong. I very much doubt the injectors are flowing the 33lbs that you think they are.

[bubba68ss]

What’s the relation of injector flow rates to maf reading?