Phil99vette

iTrader: (11)

With some cars having speed density from the factory and some race cars having speed density definitely makes you wonder if we really need a MAF. Granted a MAF will correct for any little issues in the tune but it is really needed? Can you tune the VE table so that during normal driving you command a 14.7 like with a MAF and once your on the gas or up top you go to a safe 13.0-12.5?
Phil

txhorns281

iTrader: (12)

That's the way it is, regardless of MAF or SD setup. (At least during closed loop fueling). The MAF is better at handling airflow transients though and like you said, keep fueling more consistent.

RedHardSupra

iTrader: (1)

if you live in hawaii, or any other super-stable weather sort of place, sure
I live in chicago, that means -30 in the winter and 130 in the summer. I need the maf. There are people that have multiple tunes (50,70,90F) and just load up proper before they go to the track. So if you want a perfect tune the track keep that SD tune around, but normally, I'd drive around in MAF.

Phil99vette

iTrader: (11)

Can you use the IAT to compensate for the different temps or does that only modify the A/F when the MAF is used?
Phil

txhorns281

iTrader: (12)

the IAT is already a factor in SD fueling, and that's part of the reason why SD airmass calcs are more prone to error. The MAF soaks up a good amount of IAT and MAP skewing. In essence, the MAF encompasses the readings of two sensors (and their error margins) and consolidates it to one measurement. No the MAF is not perfect, but it takes into account a more central perspective on airflow, as opposed to independent sampling.