Dyno and AF

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Apr 28, 2013 | 03:55 PM

#21

Supercharged111

Safety Car

Joined: Jan 2012

Posts: 3,956

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From: Da U.P.

Quote:

Originally Posted by tacman

Why would you turn off the MAF during tune? I would assume that the MAF is a component of the AF

2 ways to skin a cat here. 1 is turn off the MAF, the other is turn off the MAP (and then vice versa when done with that). You can't leave them both on, because both feed different tables/maps.

Quote:

Originally Posted by tom01ss

on a manual car you can adj fuel by playing with the maf. speed density turns the maf off, the maf measures airflow , everything needs to be tuned together in order to work together. you cant do one without the other.

You must tune the 2 separately. You don't tune fuel by "playing with the MAF". If it's wrong, you correct it (and the VE map that's likely wrong too), and your commanded fuel becomes your logged fuel. EFILive has a feature that allows you to tune both simultaneously leaving them both on, but I doubt that's what you were referring to.