Did the auto VE now runs a lot better in SD than with MAF

[isak81]

So I did the autove like the tutorial says. I added 10% to the VE table and during the logs fueling was almost perfect.
My truck is almost stock so I didn't figure I was that much short on fuel, but its running pretty strong. I started adding timing
and the truck responded well. Now I returned it to normal with the new VE table and added timing. My fueling went back into the
gutter and KR jumped up. So how do I get my MAF to match my VE table?
I tried to do the calc.vet in reverse but I cant find all the pids in my scanner.

[joecar]

You need to do the AutoMAF procedure... this is the same as AutoVE but with MAF enabled and VE disabled (B0120 set to zero), and you use the BEN to correct the MAF table B5001.

[isak81]

IS there a write up on it anywhere? Sorry I'm not completely following.
I'm trying to learn how to tune by myself but sometimes my only option is to ask.

[joecar]

There is no writeup... there are several threads...

the procedure is the same as AutoVE but with these differences for AutoMAF:
- leave the MAF enabled (MAF DTC shpuld not trigger),
- disable the VE (set B0120 to zero),
- set the BEN map to look like B5001 (copy with labels from B5001, then click Paste Labels in the map Row and Col tabs),
- you leave the VE table as it now is (i.e. don't bump up the VE table; see next point);
- you may or may not need to bump up the MAF table by 5% or 10% or some amount.

Be sure to apply the transient filter before paste/multiplying the BEN map into B5001.

The Calc.VET tutorial thread contains some guidance/information.

[isak81]

Thanks joecar! I didn't understand even after that^^^^.
But I opened my scan and tune tools to try it anyway.
When I started working on it it came together pretty fast.

[joecar]

Thanks joecar! I didn't understand even after that^^^^.
But I opened my scan and tune tools to try it anyway.
When I started working on it it came together pretty fast.Post images of your MAF BEN map.

[isak81]

12679
Is that right?

[isak81]

I just changed it. Am I supposed to have calculated airflow rate in the column
and mass airflow raw frequency in the row?

[isak81]

12680
Am I going backwards or did I miss something?
I went back over the calc.vet thread and I couldn't get my scanner to read all
the PIDS. This is a 2000 Chevy Silverado if it matters.

[joecar]

MAF BEN map:
- Data is BEN.
- Col (vertical axis) is Hz.
- Row (horizontal axis) is any pid (say Hz).

The easy way to set up the map axes is like this:
- in the tunetool, goto B5001 and do copy with labels (in upper left blank tile do rightclick->Copy with labels),
- in the scantool, in the MAF map, on each of the Row and Col tabs click Paste Labels,
- on the Data tab select the BEN pid;

And also, on each of the Data, Col, Row tabs checkmark Show Units.

[Supercharged111]

So is it preferrable to do Auto VE first or Auto MAF first?

[isak81]

I did Auto Ve first.