I have been driving my car a lot. And slowly I have been making adjustments to the MAF airflow frequency in baby steps in accordance to the LTFT's. I am noticing that it is actually making a difference. Initially it was at +18%. I changed the whole airflow table to a stock table and that brought the LTFT's to -12% Then from there, I slowly made changes to the whole table by reducing the table by small percentages. (multiplication) Got it down to -3% and even -1% to .8% in some areas. My goal was to keep it on the negative side from 0% to -3% and it looks like I am succeeding. (Part throttle tuning) I want it zero to negative so that fuel is not added to PE on WOT.
I know that the way its supposed to be done is t disable the fuel trim control and the SD interference. But I decided to try making small changes and at the same time learn the basics of HP Tuners. And it seems to be working. It does take longer doing it this way but since I drive the car a lot, I can see the changes over time and can tune at my convenience. Car runs great.
My question is what is the downside to this method?
E38 ECU with LS3/L99 hybrid engine in a Chevy Nova. Wideband is installed and I will soon integrate it into the logging software for future tuning as I continue to learn.