Cobra maf differences - Z31 Performance

Matt89

Senior Member

Posts: 2380
#1

Cobra maf differences

08-02-2009, 10:42 AM

Is there any difference between later style cobra mafs and the earlier 89-93 ones besides the actual casing. I have been trying to run a newer one with my Jim wolf setup. A/F ratios are all messed up. 11's at idle, mid 12's under cruising, high 15's transitioning into boost and high 13's at full boost. Something is wrong and all i can think of is that i am running the wrong maf with the JWT computer. Any ideas?

Bolt on, fast, z31. You can only pick two.
Old weaksauce numbers: 391hp/433tq
Matt89

Senior Member

Posts: 2380
#2

08-04-2009, 12:33 PM

Anybody?

Bolt on, fast, z31. You can only pick two.
Old weaksauce numbers: 391hp/433tq
Steve88t

Senior Member

Posts: 1337
#3

08-04-2009, 12:55 PM

As I understand it, the 93 cobra maf is unique to that year. Some people think there is a Lightning that uses it as well but I don't recall the details on that.

If this is true, then your afr's are off because the VQ map is all wrong.

http://z31performance.com/forum/viewtopic.php?f=5&t=147
Matt89

Senior Member

Posts: 2380
#4

08-04-2009, 01:43 PM

Thanks steve :-D

Bolt on, fast, z31. You can only pick two.
Old weaksauce numbers: 391hp/433tq
Matt89

Senior Member

Posts: 2380
#5

08-04-2009, 04:05 PM

Ok, i've done some research today and found something interesting on an sr forum.

I had some concerns about differing part numbers for the 1993 Mustang SVT Cobra MAF that could be used with a JWT programmed ECU. Because of the age of the car, it was becoming difficult to find a new MAF. In addition, I found differing part numbers from what JWT listed.

Below is an e-mail from JWT stating what is needed:

The OEM stock 1993 Ford Cobra MAF sensor is the only MAF that we
program for and not any aftermarket MAF sensors that exist (ie:
Granatelli, etc.). There are two different part numbers associated
with this MAF sensor and the part numbers must be an exact match for
the MAF to be the correct one. Here are the part numbers for your
reference.

Ford Dealer parts number = F1SZ-12B579-A

Ford Engineering number on side of MAF itself = F1SF-12B579-AA and
also on MAF = AFH70-02

That cleared up the confusion I had, since many of the remanufactured MAFs had the F1SF-12B579-AA part number listed. Hopefully this will do the same for anyone who has similar concerns.

Bolt on, fast, z31. You can only pick two.
Old weaksauce numbers: 391hp/433tq