MAF / LTFT tuning

[scoob8000]

So most guides go something like this:

Disable (Almost completely) power enrichment by some means, reset fuel trims, drive for 30ish minutes while graphing LTFT against MAF Hz. After a good drive, copy and paste special multiply by half into your MAF Airflow Vs Output frequency table, smooth all, then repeat the whole process 1-2 times.


I have a few questions though from seeing some variations of this.

Should we be disabling Deceleration Enleanment and DFCO as well? When coasting during a scan, I see my LTFT's go +6 or so as it kicks in. Won't that hurt our calibration? And on that note, we disable Power Enrichment, but not Aceleration Enrichment.

Is resetting fuel trims enough? Some guides have you disable LTFT learning completely during the process.

[jtrosky]

This is that best non-wideband MAF calibration procedure I've found....

http://www.silveradoss.com/forums/to...he-maf-sensor/

[TSloper]

I would recommend using polynomial curve fitting to generate the final MAF table values. You will get a very smooth curve. This can be done in Excel.