MAF Calibration Tutorial
 

This tutorial can be followed for both the Gen 1 MS3, Gen 2 MS3, and also the MS6. If you upgrade to a larger than stock MAF housing you will have to scale the entire maf curve before performing your MAF Calibrations as the larger cross section allows for more airflow with less cooling to the MAF resistors due to the decrease in air velocity.


If you have a larger than stock intake, you will develop a scalar first and THEN follow this tutorial. If you have a stock sized aftermarket intake, skip right to the videos.

In order to develop a scalar for a larger than stock intake diameter, you must take the (New MAF Cross-Sectional Area) and divide (/) it by the (Stock MAF Cross Sectional Area).

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You already know the cross section of the MAF housing is a circle and the area of a circle can is derived as (pi*r^2). Another derivation of this formula is (pi*d^2)/(4). When deviding the two cross sections, pi and all other constants will cancel. Therefor, all you need to do is take the square of the new MAF Diameter and divided it by the square of the stock MAF diameter. Simple as that.

Example Scalar: You decide to upgrade to a 3" intake (76.2mm). The stock MAF housing is 66.5mm diamter (2.61811"). You can either convert millimeters to inches or inches to millimeters, the choice is yours.

(76.2^2) / (66.5^2) = 1.313

Take 1.313 and multiply it by the entire MAF curve. Now you are ready to start your MAF Calibration. This is ONLY for vehicles with a larger than stock intake installed. This is only an example for a 3" intake.

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***Please be careful when performing WOT (Wide Open Throttle) logs. You will be breaking the law because of the speeds you will be accelerating to in 4th gear. Make sure your tires are in good condition, have adequite pressure, and that your car is aligned properly. Anything can go wrong at over 100 MPH and extra caution must be taken when logging these pulls. You are at your own risk when performing WOT logs and you must take every precaution before starting.

For best results, watch in 720p HD and full screen and in the order they are placed. You can also download the zipfile to keep them on your computer and watch offline. Also i apologize for constantly coughing. I was still getting over having a sore throat from a cold.


If you would like to know how i mounted my AP, you can visit this thread...

http://www.mazdaspeedforum.org/forum/foru...ssport-121495/

Setting up your Accessport

How to perform a closed loop MAF Cal Log

How to analyze the data from your closed loop MAF Cal log and make the appropriate changes in AccessTuner Race

Making Sure you do not have any dips in your MAF Curve!

How to perform a WOT (Wide Open Throttle) Log

How to analyze the data from your WOT MAF Cal log and make the appropriate changes in AccessTuner Race

Good job, that should help some guys.

Great videos, Thanks man. I am saving now for an AP and these videos just solidified what I thought I needed to do when I finally started doing power mods and needed a MAF Cal.

Videos are always so much help when showing people how to do things rather than trying to explain how to do it. I wish everyone on this site, when doing a tutorial on a "how to" included video just to back up what they are trying to teach us noobs.

Needs to be a sticky

tapafuck

Good post...

Definitely sticky worthy

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Now the noobs have no excuse to not do this. And get slapped when they fuck it up.

Guess I should upload my video where I show people how to use and setup and ap to log the right things to tune.

WOT Cal video?

Funny thing is, I've had people ask me how to do a wot pull lol. "so stop at a light and then just rip it?" lol

I plan on doing this real soon. My only problem is that my actual map (the one i used for the video is just a dummy map) hits my AFR's spot on. I don't want to "theoretically" show noobz how to do it, i want the AFR's to actually be wrong so i can show them what to do.

I'll try and work something out. I might have an old WOT log that had some AFR's off. I'll take a video of how to do the corrections for that. And because of pure humor at the questions @dantes5823 gets, i might just have to do an in-car WOT pull LOL totally unsafe. Ganna need someone to hold the camera

Members make this community what it is. Thanks for your contribution.

** Edit **

I ripped the videos and made them viewable offline while in the car if you dont have net access.

Nice Job. Will be usefull to the new guys...

@Haltech,

Thank you for doing that ! However please stay tuned, as i will be uploading one last youtube video for WOT Maf Calibrations shortly and you can add that to the zip file :)

Might as well just make this "AP usage for dummies" and make a "setting up your ap" and then maf, wot maf, and just normal wot. I haz go pro if it helps man.

not a bad idea Jon. If i can't get a hold of gilly's go pro, maybe we can grab a video on tuesday? Lets see

UPDATE

I was able to obtain a friend's WOT log and added a WOT Maf Calibration video to the OP. Also @Haltech, i know i posted this is in the Gen 1 forums. The same concept goes for the Gen 2's as well so if you can make sure they will see this thread even in thier department (if its possible).

Awesome. Thanks for taking the time to do this ms3blackmica!

This is just awesome of you to take time and do this. So newbs... you have no excuse for not doing this.

Anytime. I'm a very academic person and i can understand the complete blankness some people get when wanting to toy with their AP and ATR. I see how many noobs don't get it, and i felt that if we could just show them in person, they would understand ! So, a video is the next best thing :)

yes they deff don't now :haha:

i think i will most likely take a "clear" video of how to set up your AP to log the correct parameters for both Closed Loop MAF Cal and WOT MAF Cal as well and make that the first video as @dantes5823 recommended. I may even make a video of how to go WOT in a safe manner. I know it sounds silly but some people truly do not know. And the idea is to make sure people are safe when trying these things. The more resources we can provide for newcomers, the better this forum will be :)

Not if I beat you to it!!! Muahahah

And you. An just make one video for wot and use that for wot maf and a normal wot pull.

LOL oh snap ! Well the AP setup i can certainlly do shortly. But the WOT pull would have to wait until i see gilly tonight.

Feel free to send me the link if you get a video, and i can throw it into the OP.

EDIT: Jon i am not really good with editing videos or anything like that. I don't have any software to combine videos. Only thing i have is a screen capturing program that i used for these videos. I've always left the video editing for friends who are better at this lol

I have a video already from a while back for setting up the ap. but I won't use it. And as far as the using for thin I'm saying just be like hey this is a wot pull. Then next video be like ok this is what you look at for maf and then all this shit is what you use to tune.

Well i've already made the WOT Maf Cal video and as i said, i don't know how to edit (nor am i good at it) videos after they have been made. I'll mess it up lol

What i can do though, is when i am making the video for the WOT pull i will be sure to mention at the end "The next video will demonstrate how to analyze the data from this log in order to tune your WOT Maf Curve". Then when i am all done, i will Number each video Part X of X and in the order they should be watched.

Boom there you go. Do work son.

And now that I think of it. My car is prob horrible for making a video. All you'll hear is clutch chatter. My car shaking to peaces and then my ewg cracking open lol

Good refresher for me as Im about to install my 3" Intake and TIP

Figured out your scaling factor yet?

Just tag me.. i can add it

awesome videos! thanks for doing this.

I think i may run home tonight and try to do my MAF Cal. now. I was hesitant because i have no idea what i'm doing in ATR, and just haven't had time to re-read abilor's guide.

no problem.

Just make sure you drive around as much as possible (about 50 miles). I personally like to monitor Mass Airflow (g/s) on the screen while driving around to make sure that when i get on the gas, that i am hitting up to 80~100 g/s to make sure that there are some learned trims up there for best results.

The stock break points are different among cars tho if I remember correctly. I mean gen1,2 speed6.

I took a lot at the stock mapping for 2009 MS3, 2011/2012 MS3, and 2006/2007 MS6 and they all appear to have the same breakpoints except for one exception on the 2011/2012 MS3 not having a breakpoint at 30.00 g/s.

They all go from..

0-5.70

5.70-18.00

18.00-30.00

30.00-200.00

The 2011/2012 stock mapping goes from 18.00-200.00. I don't have ATR for 2007/2008 or 2010 so i don't know what the stock mapping has for that.

Nonetheless, i like to create the other breakpoints at g/s values that i typically drive around. I do a lot of 6th gear highway cruising on my daily commute and night time driving and i usually cruise around 23 g/s and somewhere around 37 g/s so thats why i have the breakpoint from 18.00-30.00 and 30.00 to 50.00. And i don't normally get on it very often and when i do, im usually around 60 g/s to 85 g/s. I basically taylored the breakpoints to the way i drive to get best results. Doing this yeilded me very precise results for the average of LTFT and allowed me to really tighten up the MAF values. I'm usually around 0.68% LTFT and dont normally see more than 1.6% LTFT

I've been driving on one of the OTS maps for a few thousand miles. the 50 miles is if you've just flashed, right?

yeah if you re-flash any map, your LTFT's will reset and be at 0 again so you need to put some miles on to learn some trims

yeah, plenty of miles have been attained on this map, so it should have relearned whatever it needed to.

if you have already put plenty of miles on your current map, then you can go right ahead and grab your first MAF Cal log and get to work :)

But once you make your corrections, and re-flash your map, you'll need to accumulate the miles again before your next log. Once you get to calibrating your WOT AFR's, you dont need to put any miles on because at WOT you will be in open loop and the ECU will not have any saved trims, it will go strictly off the values you put in your MAF table. So for correcting WOT AFR's, just reflash, and go WOT. I will make a note of this in the 5th video that is still yet to come.

On the bright side, calibrating WOT AFR's usually goes by rather quickly. I like to bring my laptop out with me and grab a log, pull into Dunkin Donuts, get a drink and do my ATR work. And then i'll go back out, reflash, and grab another log. You can have it done in a night if your willing..

Just waiting for #5

it will be coming tonight (im hoping).

hopefully i will have dry roads by tonight and will have someone hold the camera from the back seat.

Had a chance to watch all the videos today and would like to thank you for the great contribution.

If you make a video on WGDC adjustment I'm sure that all of MSF will be able to adjust OTS maps to fit their cars better.

I would have no problem doing that. The only issue with that is that it can be a little more intracate than just correction your wastegate duty cycle table. Sometimes you run into an issue of the Throttle Requested Load tables limiting you from achieving your targets and i'd have to go into detail on editing those tables as well and a few other things. So if i do it, it may be a little "too much" for first timers to take in all at once.

But as far just simple wastegate duty cycle corrections go, i can do that

^^ this. Wgdc isn't hard to mess with but a few things play a roll on that. Like load based tuning and then your dynamic tables.

If you made a video and went in depth about wgdc and the things it entails I'm sure even newbies would be able to figure it out after watching all your other vids. Its all building blocks, you would just be building up. Everyone could tune their own ots map for their car safely and with peace of mind knowing they aren't interpreting a written guide the wrong way.

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