Mass air meter help or advice needed

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jrichker

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Mar 10, 2000
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#42
MAF interchange for 93 and earlier Mustang.



Swapping the MAF sensors between different MAFs is a big no no. The MAF body and sensor are designed to match each other. Therefore you can't swap sensors between different part number MAF bodies and maintain proper calibration. The assembly is designed to match the computer’s internal program, and swapping a different MAF can upset the computer's calibration. In other words, your monster MAF probably won't match the calibration of your 5.0 Mustang computer.



The OEM Ford MAFs are not calibrated to injector size. The injector sizing is done in the computer’s internal programming. Aftermarket MAF’s “lie” to the computer in an attempt to fool the computer into changing the injector pulse on timing to match the increased airflow.



The exception to the above statements is if you have an aftermarket tuner system such as Moates Quarterhorse, Tweecer, or similar device. Then you can alter the computer's MAF transfer function table to match whatever MAF housing and sensor you have. The tuner device works in conjunction with a high quality Air/Fuel ratio meter so that you can tell what sort of air/fuel mixture you have a any given time.



The only other MAF that is a one for one swap for a 93 and earlier 5.0 Mustang is the 94-95 Mustang MAF.



94-95 Mustang GT MAF - $40-$100. It is 70 MM instead of the stock 55 MM on regular stangs built prior to 94. It uses a slip on duct on the side that goes to the throttle body and a 4 bolt flange on the other. You need a flange adapter to fit the stock slip on air ducting that goes to the air box. Wiring plugs right in with no changes. *1 *2



Once your replacement 70MM MAF is in place, disconnect the battery for about 10 minutes. When you reconnect the battery and start the engine, the computer will relearn the settings for the new MAF.



*1.) Metal flange adapter http://www.kustomz.com/components.html Buy the TR70 for $39.95. Or spend some time on eBay looking for one that may fit.



*2.) MAF & sensor interchange

The 94-95 Mustang 5.0 MAF & sensor is also found on:
1995-94 Mustang 3.8L F2VF-12B579-A2A,
1994-92 Crown Victoria 4.6L F2VF-12B579-A2A,
1995-94 Mustang, Mustang Cobra 5.0L F2VF-12B579-A2A,
1994-92 Town Car 4.6L F2VF-12B579-A2A,
1994-92 Grand Marquis 4.6L F2VF-12B579-A2A,

Evidently the –A1A, -A2A, AA, etc. on the end of the part number is a minor variant that did not change the operating specs. You should be able to ignore it and have everything work good.
 

Mustang5L5

Car used in adult film "Highway Gangbang-InDaButt"
SN Certified Technician
Feb 18, 2001
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Massachusetts
#43
Swapping the MAF sensors between different MAFs is a big no no. The MAF body and sensor are designed to match each other. Therefore you can't swap sensors between different part number MAF bodies and maintain proper calibration. The assembly is designed to match the computer’s internal program, and swapping a different MAF can upset the computer's calibration. In other words, your monster MAF probably won't match the calibration of your 5.0 Mustang computer.
.
I agree with you except the two 70mm housings we are discussing appear to be identical other than the mounting interface (flange vs coupling). Given the assumption that they do feature identical internal designs, they it would theoretically be able to swap the electronics between the two.

Of course, this would require testing to conform to see if the output of a SN95 factory MAF is the same as if the F2 electronics were swapped over to the courgar/tbird housing. Pending that testing...it's all a theory.
 
Feb 3, 2009
48
1
9
asheville n.c
#44
I agree with you except the two 70mm housings we are discussing appear to be identical other than the mounting interface (flange vs coupling). Given the assumption that they do feature identical internal designs, they it would theoretically be able to swap the electronics between the two.

Of course, this would require testing to conform to see if the output of a SN95 factory MAF is the same as if the F2 electronics were swapped over to the courgar/tbird housing. Pending that testing...it's all a theory.
Soon as the weather clears up some here I'm going to try the F2xxx sensor in the 70mm housing and see how it does.
 

vristang

10 Year Member
Mar 31, 2005
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#45
Of course, this would require testing to conform to see if the output of a SN95 factory MAF is the same as if the F2 electronics were swapped over to the courgar/tbird housing. Pending that testing...it's all a theory.
No testing needed...
The MAF Transfer for a stock Fox A9* ecu'd, 55mm housing/sensor, is nearly identical to the MAF Transfer for a 70mm housing and F2VF sensor.
So close that it is well within the ability of the ecu to correct, and for all intents and purposes, identical.
This means that, for a given unit of airflow, the voltage output of both meters is the same. The computer can't tell the 2 meters apart.

The most common mixup is using the wrong sensor on the 70mm housing...

Somewhere on this board, there are threads here that contain either spreadsheets or images of graphs that compare the MAF Transfers of these meters.
It was years ago though, lol
 
Feb 3, 2009
48
1
9
asheville n.c
#46
No testing needed...
The MAF Transfer for a stock Fox A9* ecu'd, 55mm housing/sensor, is nearly identical to the MAF Transfer for a 70mm housing and F2VF sensor.
So close that it is well within the ability of the ecu to correct, and for all intents and purposes, identical.
This means that, for a given unit of airflow, the voltage output of both meters is the same. The computer can't tell the 2 meters apart.

The most common mixup is using the wrong sensor on the 70mm housing...

Somewhere on this board, there are threads here that contain either spreadsheets or images of graphs that compare the MAF Transfers of these meters.
It was years ago though, lol
 
Feb 3, 2009
48
1
9
asheville n.c
#47
I lucked out this afternoon and came across a 94 crown Vic in my local scrap metal yard. I snagged the whole MAF off of it for less than a $1! It's an original F2VFxxx sensor not reman this time. The crown only showed 70k miles, it was a real shame, the car was clean as a pin.p
 

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Blown88GT

Founding Member
Nov 13, 1999
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Palm Beach Gardens, FL
#48
$1.00???!!! Bargain of the year. You can machine the flange off & use the whole assembly. Remove the sensor to see if it's dirty. Clean the 2 resistors with alcohol & a cue tip.
 

Mustang5L5

Car used in adult film "Highway Gangbang-InDaButt"
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#49
Damn that's a deal and then some
 

vristang

10 Year Member
Mar 31, 2005
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#50
You should be able to install the F2VF sensor in the 70mm housing that you had originally, it was the slip fit style not the flange style, right?
 

Reddevil91

5 Year Member
Mar 3, 2010
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#52
Thought I could chime in here and get some answers from you guys. So I’m planning on running 60lb inj. Saw these two Pro M 80s for sale one is already cal’d for 60lb and the other is cal’d for 30s. I know I could send the unit back and have it recalibrated for 60lb. I don’t know how much that would be though. The guy with the 80 for 60s already wants 125 for it, states he is going carb and has been on the car since last fall and sent me his receipt. It does say recal. on his. What do you all think? This will be going on with a blower once I get to it.
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Reddevil91

5 Year Member
Mar 3, 2010
591
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#55
I'd do it, you could call pro m with the serial number to confirm.
So as for the 1st one which is now calibrated for 60s he did send it back for recal since he orig went with 42lb, states he had one the car for about 200 miles or so, got it tuned, went to strip and did 3 or so passes and his tranny gave out and was leaking. Sent me his proof or recal. And some pics. The deal is pretty good to me at 125. I’d pass on injectors just bc I think I’d get those new even though his seem ok but wants 250. Unless I can bundle. The second one I put up the 80 for 30 looks clean but I would have to send back, he wants 300 for that one and at that point I’m in a loss bc I’m sure recal is about 100 bucks. So you would go for this one at 125?
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General karthief

wonder how much it would cost to ship you a pair
Mod Dude
Aug 25, 2016
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#56
Keep in mind that I am not an expert, only know what I have heard around here and pro m is recommended a fair amount of times, that and what is there to wear out? What do they cost new, $300 to $400 ? If I needed one I'd do it.
JMO.
 

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