MAF question

[gerzen]

hi fellas, well i have a good question for all you gurus of the mustang world, i have a 91 5.0 stang, recently i make an intake, heads and TB swap, so the best way to go was an adding an MAF swap so i check at ebay and get a 70 mm housing whit a maf sensor and they said that the unit was calibrated for a 19 lbs injectors, so i bougth it and receive when i see it i notice that the little black box, (maf sensor) have the same number as my stock unit, F1ZF-12B579, i mean, the both sensor are equal, my stock unit 55 mm, have the same sensor as the 70 mm unit, so my question is if the black box is calibrated for the 19 injectors and 55 mm? or, the little hole in the housing is that determine the 70 or 55 mm calibration? i need to replace the little balck box for another that comes calibrated to 70 mm whit 19 lbs injector?

i make these question because when i install that 70 mm unit i dont feel any better response or performance do i need to get the proper mas sensor (little black box)? for get a better results?

 

[jrichker]

The 70 MM MAF needs a F2VF-12B579-A2A sensor. The 70 MM MAF is normally found on 94-95 5.0 Mustangs.

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,
The A2A, AA, AB, etc, on the end of the part number are minor changes that do not affect the calibration.

 

[HISSIN50]

Jrichker is right on.

With a 55 mm sensor in a 70 mm housing (or a 55 mm MAS in a 70mm MAF to use Vristang's verbage, which I like for clarity), you should run lean.

Get a MAF/MAS assembly with the F2VF number Jrichker noted and you'll be set.

Good luck.

 

[gerzen]

Thanks a lot guys, so i just need to get the F2VF sensor and install it in my 70 mm maf housing rigth and whit that i just set?

btw this is the 70 mm unit that i bought at ebay:

http://cgi.ebay.com/ebaymotors/1993...015QQitemZ250146081158QQrdZ1QQsspagenameZWDVW

can i use it? just put in there a F2VF sensor? i mean for dont waiste it that unit, and because i ready have it, just get only the proper sensor, im rigth?

 

[HISSIN50]

For all intents and purposes you should be able to just get the F2 sensor and use it in an F2 housing (like the one you are supposed to have). The guys always say that the sensor and housing are matched as a pair but I'd think that adaptive control would make up for any variances in the sensors (amongst F2 sensors - I'm talkin about making up for manufacturing tolerances).

EDIT: I didnt read the ad carefully enough. That's advertised as a 93 Cobra sensor and housing. The sensor's transfer curve is different than your GT's curve or a 94-95 GT curve. You might be able to turn around and sell that meter (as a whole for a decent price) and just buy a correct 94-95 meter and housing.

 

[gerzen]

the problem is that i bought last month, bt you are rigth, i need to sell, but just for fixed the problem can i compare the 94 maf housing whit my 70 mm cobra housing and see if that have the same dimentions? and use just the F2 sensor if the two are or have the same tube size?

 

[Red88 RICK]

i thought since its a cobra MAF it would not be calibrated for 19 injectors?

 

[gerzen]

yeah you are rigth the cobra have it 24 lbs injectors, but if the housing is or have the same dimentions as the 94 5.0 maf and i install a F2VF maf sensor in that it could be work, i would like to install that 70 mm cobra unit, because it have the same bolts and entries for the hoses as my stock unit, i know that i just need to cut the holes (thats bolt to the 94 air filter) to install it in my stang but if i just can reuse my cobra 70 mm unit whit the proper maf sensor it would be great

can that work?

 

[HISSIN50]

Ford doesn't have calibrated meters (we've been brainwashed by aftermarket MAF companies there). However, if we want to think of the Ford meter that way, the 93 Cobra meter would be 'calibrated' for 19's.

 

[gerzen]

yeah that brain washed is the cause that im totally lost here, so if the two little tubes in the maf housing (94-95 5.0 stang and my 70 mm cobra housing) have the same dimentions can i use the cobra unit whit the F2VF-12B579 sensor?

 

[5.0TailPipeHump]

Just a quick question on the maf , if this was to be put in (70mm) would you have to disconnect the battery then after your all done reconect the battery and let the computer learn the new setting that might be taking effect.

 

[HISSIN50]

yeah that brain washed is the cause that im totally lost here, so if the two little tubes in the maf housing (94-95 5.0 stang and my 70 mm cobra housing) have the same dimentions can i use the cobra unit whit the F2VF-12B579 sensor?

Forget about the tube inside the MAS (sensor). That's more aftermarket brainwashing (some aftermarket MAF's screw with the sample tube to trick the computer. The OEM meter doesnt). The MAF only tells the computer how much air is flowing.

With the concern I noted before about MAS and MAF interchanging, you should be ok with a 70 mm housing from a 93 Cobra or 94-95 GT, and a 94-95 GT MAS (sensor) IMHO. I'd still just get a matching pair (housing and sensor) but you should be able to use the housing you have if needed.

 

[gerzen]

ok now i see with clarity,so in conclucion the MAS have a two holes, the bigger one let air enter to the engine and the little one let air enter to the MAF resistor, i assume, that the little hole have the diameter to let enter just the air enough to tell at the MAF that the diameter of the bigger one is of a 70 mm, the MAF or the electrical sensor, read the amount of air that is passing trhu the unit and tell it to the ECU, that MAF electronic unit is the one that have the ability to tell the ECU that the diameter is of 70 mm and it works only whit 19 lbs injectors. i mean, that little black box has to be calibrated or have the info for and specific aplication, if the engine have a 55 mm MAS and 19 lbs then the little black box have to be matched with that parameters (F1ZF-12B579) and in another example if the engine have a 70 mm with 19 lbs so the MAF have to be matched whit that info. (F2VF-12B579) so any aplication or MAS have to get his proper MAF im rigth? and thats why you can not miss matched, did i learn this lesson? teachers

thanks for the patience and the help

 

[302RollinHard]

one other thing....if it is a REAL cobra MAF meter (sensor and housing) the sensor will have a part number starting with F1SF.....Ebay is a horrible place to buy some things cause people straight up lie.

 

[HISSIN50]

ok now i see with clarity,so in conclucion the MAS have a two holes, the bigger one let air enter to the engine and the little one let air enter to the MAF resistor, i assume, that the little hole have the diameter to let enter just the air enough to tell at the MAF that the diameter of the bigger one is of a 70 mm, the MAF or the electrical sensor, read the amount of air that is passing trhu the unit and tell it to the ECU, that MAF electronic unit is the one that have the ability to tell the ECU that the diameter is of 70 mm and it works only whit 19 lbs injectors. i mean, that little black box has to be calibrated or have the info for and specific aplication, if the engine have a 55 mm MAS and 19 lbs then the little black box have to be matched with that parameters (F1ZF-12B579) and in another example if the engine have a 70 mm with 19 lbs so the MAF have to be matched whit that info. (F2VF-12B579) so any aplication or MAS have to get his proper MAF im rigth? and thats why you can not miss matched, did i learn this lesson? teachers

thanks for the patience and the help

I do believe you have the idea down.

 

[04sleeper]

JT is right on as usual.

Here's a more in depth read of the MAF by Mike Wesley if you want to learn more.
http://www.fordfuelinjection.com/files/How_MAF_works.doc

 

[white99gt]

On a H/C/i car best meter is a lmaf (80 or 90mm) and a dyno tune to get the best out of the meter and motor.

 

[gerzen]

thanks for all your help to let me understand how that one of the most important EFI system works y just have a wrong idea about the whole thing, why because the info that is constant receive from the aftermakers parts supliers, thanks and i just keep study this amazing mechanic world

 

[strtrcr50]

Were the breasts in the background included?

 

[gerzen]

04sleeper
JT is right on as usual.

Here's a more in depth read of the MAF by Mike Wesley if you want to learn more.
http://www.fordfuelinjection.com/fil..._MAF_works.doc

ok acording to the info in this article, the maf consist in a hollow body where the air icome to the engine also have a small tube whit two sensing elements exposed to the incoming airflow, the ratio fo the bigger hole is calculated in such a way that just the rigth amount of air is enter the sampling tube, so the two elements one read the temp of the air income and the other is heated to a constant 200° the airflow income thru the maf cold the two elements so for raise again the temp to 200° the energy need to get it is the info that the MAF send to the ECU as a volts so the ECU is the one that is calibrated to 19 lbs or 24 lbs injectors and just use the amount of air that is receive thru the MAF, here is the thing so the maf have a table or a calibration that send a determinated amount of volts to say at the ECU the amount of airflow that is enter to the engine, so what could be the diferent between the F1ZF and the F2ZF? the work of the sesnor is just read the amount of the airflow but maybe have a diferent curve values, like the dieferences between the cobra and the stock 55mm maf, does any body have the table whit the transfer function that convert maf voltage to an airflow values of the 94 -95 maf sensor? (F2ZF)