Share your MAF Calibration

[skiptownmcat]

Corksport intake maf cal, I also use a quicker closed loop to open loop timer so have also changed that within the tune so it's the same

[Steve @ VersaTune]

Usually the only thing that affects the MAF cal is any change in shape of the pre-maf intake piping or diameter of the MAF housing.

Interesting, after having a 3" TBE fitted my MAF calibration was all over the place and the same occurred recently after fitting the DNP manifold and BNR stage 2 turbo.

Those mods can affect acceleration enrichment. Steady state operation should deliver consistent MAF calibration data.

[Steve @ VersaTune]

When posting, please post your MAF table in .xls or .ods format. The .vtune files are not interchangable between the various vehicle platforms and can not be opened with a copy of VersaTuner licensed for a different platform.

[Steve @ VersaTune]

Here is Treadstone 3.5", CP-E 3.25", generic 3", and AEM/Mazdaspeed CAI.

Use these as a starting point. They may contain vehicle specific compensation for things like dirty injectors or possible air leaks.

[mituc]

Steve, what is the MAF housing diameter on the AEM/Mazdaspeed CAI? it looks like I have to scale my Cobb SRI mafcal even more (with like 3-4.5% more) and it would be nice to have a point of reference.

[Steve @ VersaTune]

I believe it's 2.75" It is a 3" pipe with a reducer insert where the maf sensor is. The AEM/Mazdaspeed CAI table is for MS6.

[mituc]

Ok, guys, in my search for smoothness I found the ultimate trick.
As you all know the MAF g/s readyngs, commanded versus actual AFR readings, and so on, are delayed or at least not perfectly in sync because of various reasons:
- OBD scan delay;
- takes a while before the actually metered air produces any AFR effect on the lambda sensors in the exhaust;
- sensor voltage variation delay;
- possibly others.

After spending good hours to smooth every new MAF cal I was generating based on the decently high amount of logs I'm taking with every occasion when I need to do this it occurred to me that I need a higher resolution graph. So I imported the MAF V and the MAF g/s from the MAF cal into an Excel sheet and I generated a graph with the MAF V on the X axis and MAF g/s on Y.
Oh man, the graph was full of bumps, twists, sudden increases followed by almost constant and small climbs, and so on! It was looking awful, no wonder that I had to adjust my MAF cal all the time and never got it perfect!
Then I used a trends function, average every 2-3 cells should work fine. I smoothed the values based on that until I've got it smoothed. I also used the new linear interpolation feature in Versatuner to generate a trend of multipliers to make sure the newly generated MAF cal matches some specific transition points that were in the middle of 0 AFR variations or 0 LTFT's for a long time.

I have no tool to smooth my MAF cal somehow else, this is how I worked on it. This isn't a template that you can work on as I did a lot of manual work, there's nothing really automated. If you have a Cobb SRI you can try this MAF cal (the "MAF g/s smooth" values represented by a blue line on the graph).

[mituc]

Ok, the last Cobb SRI MAF CAL I posted is within -2.3 - +1.4. After another month of work (yeah, one whole month + a few days) I managed to bring it to -1.6 - +0.8. Is that the perfection itself or still needs some light tuning? The interval limits will vary with the ambient temps and atmospheric pressure (I'm at about 100.4kPa and now there are +32C), but still the variation interval is very narrow.

[summerblink]

When posting, please post your MAF table in .xls or .ods format. The .vtune files are not interchangable between the various vehicle platforms and can not be opened with a copy of VersaTuner licensed for a different platform.

Hi all, i'm all new to Versatuner and liked to know, does anybody have
Base 93US_98EU Octane High Load+cs sri+tip maf cal v1.03 in .xls or .ods format (or can I somehow transform .vtune file?)

I have a Mazdaspeed6 with only CS sri+tip set installed, and I was wandering where and with which tune to start with.
A readymade MAF calibration for my setup surely would be a tasty treat, of course all other ideas would be highly appreciated

Like "Hey n00b, why don't you install the anti-theft tune, it cuts your mpg like anything!"

[mituc]

The MAF cal is not something particular to a tune. You can import the existing data in the files shared in this thread and add it to your tune.