How come sometimes I tweak the LTrim and they are negative through almost all cruise consitions, but still may hit a positve number transitioning to WOT, or sometimes never see a pos. LTrim, but WOT still has em adding fuel?

 

Dude I was gonna ask the same thing, I picked up HP Tuners the other day and been tuning my car, calibrated the MAF table for the ported MAF and now my ltrims are 0 to -1.6 at part throttle but at wot they go to 7 and 4.7 ...doesn't make sense. Anyone, I'd like to know to.

-Sly

 

Are you averaging the different fuel cells in excel or some program so that you really know what is going on? You really can’t get a good idea of what is happening if you are just trying to watch it while you are driving down the road. You need to be able to analyze it. The first attached file is a copy of one of the tables I use. It shows the “load” cells 6-14 with all negative numbers, so in cell 22 (wot) it doesn’t add any fuel with 0s. In the second file it shows cells 12 & 13 with slightly positive numbers so in cell 22 it is adding some fuel +.9. But I can tell you if I didn’t transfer this data into excel, I would have never “seen” it while driving.

 

"Almost all" = source of problem.

Forget averaging, you have to get the worst one
consistently <= 0.0 and let the LTFTs take care
of the rest.

 

Have you tried turning off COT test?

 

yes that was the first thing i did