Fine tuning calibrations for each CAI kit on the market today would involve allot of work, I realize this. What if you exposed the MAF transfer function to the end user? If you don't see your CAI kit supported, select "other" and enter the MAF transfer function value that you obtained by calling the manufacturer? Then support for other CAI kits and MAFs could become community driven by the members of the forum?

Just a thought...

I like that idea however it would only be able to work with the commando and Delta Force
software. we can start a header and post the transfer functions as learned right here on the forums.

PS

I spent a whole day with an 07 GT automatic with a new K&N FIPK a few weeks ago and got pretty good results , I could post it up later tonight when I get back to my laptop

Lets find out whether there is interest in this first and if so, we can create a new section to the Forum.

Chris let me know if you want I can send you this one I made for the K&N one I did

Great! It's good to hear my ideal my lead to something helpful

This seems like a good idea for Commando, but for Special Forces... just having support for the most popular brands would be fine. I'd love to have a tune for my JLT RAI.

I just posted under the 2005+ Mustang heading regarding Cold Air Intake sizes. Those numbers are confirmed numbers. And I plan on adding more as I find out the sizes. Hopefully this will get the ball rolling on supporting more manufacturers. But the Transfer Functions seem to be guarded like grandma's cookie recipe.

I think this is a great idea.

To some extent this (see below) is a "back-of-a-napkin" (BOAN) exercise, however if you were to measure the inner diameter of the stock MAF housing, and the frontal area of the MAF sensor post, you can then calculate the effective area of the air path through the the MAF (as seen in this BOAN analysis of the new-edge 4.6L 2V intake components).

MAFmm² = MAFID^2 / 4 * pi

SPOSTmm² = SPOSTwidth * SPOSTheight

MAFmm²eff = MAFmm² - SPOSTmm²

where:

MAFmm² = MAF raw area in mm²;
MAFID = inside diameter of MAF housing in mm;

SPOSTmm² = the sensor post frontal area;
SPOSTwidth = the width of the sensor post in mm;
SPOSTheight = the height of the sensor post in mm;

MAFmm²eff = effective area of the MAF in mm²;

Similar calculations using the new MAF housing's ID (the post sensor dimensions remain the same as the OEM sensor has been moved to the new housing) will provide the effective area of the new MAF housing (nwMAFmm²eff).

The ratio of the new MAF's effective area and the old MAF's represents the amount the effective area has increased.

Now the sensor samples only a portion of the air flow through the MAF, this a factor of the area of the sensor's inlet port. But since this has not changed, the exact dimensions of the inlet port are not needed, leaving only the change in the housing's effective area relevant (this will be shown below).

Let's call whatever the inlet port's area is INPmm².

This makes the sample "size" as compared to the entire MAF's effective area (MAFfnc):

MAFfnc = INPmm² / MAFmm²eff

The new housing's nwMAFfnc would be:

nwMAFfnc = INPmm² / nwMAFmm²eff

So the ratio of the old MAF's "function" to the new MAF's (MAFfncchg) would be:

MAFfncchg = (INPmm² / MAFmm²eff) / (INPmm² / nwMAFmm²eff)

or,

MAFfncchg = (INPmm² / INPmm²) * (MAFmm²eff^-1 / nwMAFmm²eff^-1)

Since (INPmm² / INPmm²) = 1 we are left with:

MAFfncchg = 1 * (MAFmm²eff^-1 / nwMAFmm²eff^-1)

which simplified is:

MAFfncchg = nwMAFmm²eff / MAFmm²eff

Using real world numbers--the OEM MAF housing ID is 80mm and we have just installed an 89mm housing. We'll assume the senor post to have an area of 900mm² as does the new-edge MAF.

The old MAFmm²eff will be (80^2 / 4 * pi) - 900 = 4127mm²;

The new nwMAFmm²eff will be (89^2 / 4 * pi) - 900 = 5221mm²;

So the MAFfncchg = 5221mm² / 4127mm² = 1.265.

I.e. for a given output sensor voltage there will be 1.265 times as much air flowing through the new MAF assembly as with the OEM MAF assembly--multiply the MAF transfer table values by 1.265 and you will have a very good starting point.

I suspect the 900mm² value for the sensor post is pretty close, and the OEM MAF is 80 mm ID, leaving the formula to be:

MAFfncchg = ((MAFidnew^2 * 0.7584) - 900) / (4127)

where:

MAFidnew = the ID of the new MAF housing

Note to self: Don't try to read and comprehend that before coffee.

So using that formula on the newer Mustangs should make it very simple for Pat and Chris to make a pull down menu for CAI size and that should give us a nice base to run it. If we get a lean code, just go in edit and add a multiplier to the Transfer Function. Sounds easier than to do it, I am sure. But at least with all these sizes we have something to go on and will add support to more CAI kits.

I may take that formula and make a spread sheet to plug in the numbers and that will get us started. Been a lot of years since I played with spread sheets or tried understanding anything remotely like what you posted.

I have an SCT tuner and prefer the Delta Force with Commando. Thought about buying the Advantage software and trying it as well. Not sure if I will now that I am learning the Commando.

I also loved the link, lots of good information. Especially the one about making your own O2 MIL Eliminators.