I have a question as i am trying to tune my LTFT to try and get them to 128. Basically i am only worried about two cells 6 and 10 as these are the cells that my car stays in most of the time when cruising. I have tunner cats and data master and have tried altering the AFGS / hz table and modifying the VE tables in the 2000 Rpm range and under. I have changed them both as little As 2% +/- and as much as 30% +/- separately of course and i don't see much change in the LTFT after. So my question is what tables should i be looking at the get my LTFT's around 128. Right now they range from 112-119 Left and 111-119 right. They usually start out at the high range and then go down the longer i drive. I have searched on this topic and its hard finding a clear answer.

 

You should be adjusting the maf tables to bring your ltft in line in those areas. Take a log and look at what the airflow value. Since it is pulling fuel out you need to tell it that its seeing less air in the table. It should react very quickly and as expected when you modify these tables. Try doing a change in the airflow area and the two to the left and right of it. Usually i dont change any value in these tables more than 5% at a time and usually 2.5% is what i do and sneak up on where i want to be.

If you are not seeing a change from adjusting the maf tables, you may want to clean your maf and verify that your o2 sensors are switching properly using datamaster. If its not changing somewhere the values you are getting to the pcm about how the air is coming in our how the air/fuel ratio is are incorrect.

Was anything done to the car recently?

 

Not recently and i have never scanned it before any of the mods so. I guess i will try and mess with that maf table again. So when if ever should i modify my Ve tables.