Gen 2 Cobb ATR discussion

[rfinkle2]

@ your service sir...link from dj to come...

italics from atr helpfile:

This comparison only relates if you have an intake system that is other than stock; if your dictated A/F is 11.0 and you measure 12.0 in the exhaust stream, then you will want to add (+) grams/sec for the MAF voltage that corresponds for that RPM and load point. The specific adjustment for the above situation should be multiplying the corresponding MAF flow grams/sec by 1.0909 = 12/11. You should be measuring very close to the same Lambda (A/F Ratio) in your exhaust stream that you have dictated in your Fuel OL/WOT Commanded EQ (No Knock) table. Your trim values will always adjust back and forth (+/-); let them, that is what they are supposed to do. You should not have to modify the MAF Calibration table if you have a stock vehicle. We highly suggest you do not spend excessive time tuning your MAF Calibration table just so the A/F output matches exactly what is dictated in the Primary Fuel table.
You will chase your tail getting it spot on then you will fill up at a different gas station that will have a different quality fuel and the targets may be slightly
off.


Could not find exact post from DJ (aka dustin)
but, thanks to @dougefresh_ for this great thread...

HOW TO CALIBRATE YOUR MAF! With An Example