Using a 93 Cobra MAF on a 91 GT???

Blue91GT · Dec 21, 2007

I am looking to upgrade my Mass Air setup, and found a used 70mm MAF from a 93 Cobra for a decent price and have a few questions. If I install this do I need to use the sensor from my old housing, or can I just plug the new one up without any additional mods? Has anyone used a similar setup? This is going on a 91 GT.....

Wallzy · Dec 21, 2007

If it is the factory MAF (and hasn't been modified) it is calibrated for 19lb injectors and if you are currently running 19lb injectors it should be plug and play.

Walz

Blue91GT · Dec 21, 2007

Wallzy said:
If it is the factory MAF (and hasn't been modified) it is calibrated for 19lb injectors and if you are currently running 19lb injectors it should be plug and play.

Walz

It IS a factory Cobra MAF and is calibrated for yellow top, 19lb injectors. I was worried that I would need a new/Cobra ECU to make it work?

When installing I should just reset the computer and drive it for 50 miles or soo right? I remember reading on another posting that in order to reset the ECU, you unplug the negative battery cable for 15 minutes or so and then drive it for a while soo it can re-learn!?!

5.0TailPipeHump · Dec 21, 2007

Yup thats what i got told is to take off the neg battery cable for 10 to 15 then pulg it in and it might idel abit funny in the beginning but it does take afew miles to learn when you plug in your new ecu.

Rick@CJs · Dec 21, 2007

Blue91GT said:
It IS a factory Cobra MAF and is calibrated for yellow top, 19lb injectors. I was worried that I would need a new/Cobra ECU to make it work?

Cobra's came stock with 24lb injectors so the Cobra MAF would be calibrated for 24lb injectors.

Blue91GT · Dec 21, 2007

Rick@CJs said:
Cobra's came stock with 24lb injectors so the Cobra MAF would be calibrated for 24lb injectors.

The listing specify's that it is calibrated for 19lb injectors but I have asked the seller just in case! Thanks for the heads up though!

Also I do NOT want to have to c hange the ECU if at all possible...

Rick@CJs · Dec 21, 2007

Any 88 - 93 MAF will work with any 88 - 93 Computer. The important part is for the MAF to be calibrated for the injectors.

Blue91GT · Dec 21, 2007

Rick@CJs said:
Any 88 - 93 MAF will work with any 88 - 93 Computer. The important part is for the MAF to be calibrated for the injectors.

Ok sounds great! Thanks, I am just waiting on a response from the seller. When he says 19lb injectors I am going to pick it up! The Part looks to be in good condition, does 50 bucks sound fair? I mean, i know the C&L's are 150 or so but are a little bigger?!?

Right now I am running MAC CAI, 70MM TB, FRPP Cobra Manifold, BBK shorties, Catless H-Pipe, and a Catback exhaust. Also just put in a 3.73 and a short throw kit. Getting it tuned here soon, Injected Engineering in Atlanta is going to do the tune.

cenok is family · Dec 21, 2007

cobra's have 24# injectors, but the injector change was compensated for in the cobra ecu, NOT the mass air meter. i have the same meter you're looking at, but i took it off because my car was running funny. something is wrong with my injectors though, so i'm pretty sure it's them, not t he mass air meter. regardless, if you are getting your car tuned, might as well get it because the tuner will get it all to work together properly.

vristang · Dec 21, 2007

Stock Ford meters are not 'calibrated' for an injector size!
Ford calibrated their meters the right way... meaning that the meter corresponds to the ecu.

Saying that the 93 Cobra MAF is 'calibrated' for 19's is simply adding to an already confusing subject.
I would call it a lie, but others will argue with me...

A couple of guys have reported using a 93 Cobra MAF on their A9*/19Lb setups with good results.
This is not ideal though, as the output of the meter does not match the way the ecu is interpretting the MAF signal.

A better option would be a MAF from a 94-95 Mustang.
Do a search, there is a TON of info on making this work. Actually, I think there is something in the 'Tech Thread Index'

Personally,
I would use the 94-95 Mustang meter, as it is KNOWN to work properly.
So far as I can tell the 93 Cobra meter makes the car run, but little else is known...

Just to be sure this guy is actually selling a Cobra meter...
The sensor should be marked 'F1SF'
The housing should be 70mm

When you say you are getting a 'tune'
what do you mean?
dyno time with fuel pressure and timing adjustments?
custom chip?

Good luck,
jason

Blue91GT · Dec 21, 2007

vristang said:
Just to be sure this guy is actually selling a Cobra meter...
The sensor should be marked 'F1SF'
The housing should be 70mm

When you say you are getting a 'tune'
what do you mean?
dyno time with fuel pressure and timing adjustments?
custom chip?

Good luck,
jason

The housing is 70mm, I will ask about the sensor itself. The tune includes a custom 4 position chip with dyno time AND fuel/timing adjustments. Here is a picture of the item itself...

Mustang5L5 · Dec 21, 2007

Rick@CJs said:
Cobra's came stock with 24lb injectors so the Cobra MAF would be calibrated for 24lb injectors.

Negative. The MAF is not calibrated to injector sizing. That is all done in the EEC.

MAF matching to injectors is strictly an aftermarket way or tricking the computer. The factory just simply reprograms the computer. It's easier to program than to design multiple parts

93tealstang · Dec 21, 2007

I don't have firsthand experience with the Cobra unit but over the years I've read way too many threads about bad results with the meter. Personally, if something isn't tested and true I would not put it on my car especially an MAF. From what I've always read, that particular meter was designed to be ran on the 93 Cobra only. Your way better off with the 94/95 meter, I've ran it for years without any issues.

NIKwoaC · Dec 22, 2007

I've read that the 70mm Cobra unit doesn't actually flow that much better over stock because of the bar running up the middle of the flow path. Don't have any personal experience though.

Funanin · Dec 22, 2007

yea i have the cobra MAF and it was supposed to only run with the cobra injectors (24#) and the cobra ecu. I think you have to have all 3 to have it run smooth.

skunk21 · Dec 23, 2007

the cobra's meter only flows marginally better than a smaller H.O. meter like the others have stated due to the placement of the sampling tube and backflow inhibitor in the primary inlet tract, which turned out to be a huge design flaw and the ecm was programed or "tuned" by the factory to correct it, later designs went to the sampling fine wire we now see. the problem was the added minimal increase in air flow restriction reduces the voltage signal, causing a unsafe lean condtion to devolp the factory designed or tuned the program to richen the mixture a move to the safe side under most operating conditions in the 93 cobra but running it in a 5.0 with 19lb/hr injectors caused a lean condition under most operating conditions. so a tune would be needed to fix the fuel/air unless you used a complete 93 cobra set up ecm, meter, injectors which ford tuned has package., but w/o the ecm, and injectors the tune would still bring marginal gains due to the limited tunablilty of the cobra meter over stock, the 94-95 meter or aftermarket meters have a better range of adjustablilty in them or less "restriction" in them which nets better results. in most cases if you talk to tuners and probally more so for the newer cars and mabye not our 55 meters but depending on the mods the meters from the factorys support alot of power and an aftermarket meter in most cases is a waste of cash.

tmoss · Dec 24, 2007

vristang is correct, the Cobra MAF transfer curve is different than other 5.0 MAFs...

stykthyn · Dec 24, 2007

not to hijack, but a move up to 24lb injectors regardless of which MAF requires a tune??

Blue91GT · Dec 24, 2007

I appreciate all of your help, would it be possible to run my factory sensor in the larger housing? Is that even an option? What would be the consequences of such a pairing>?

cobra1923 · Dec 24, 2007

If I understand correctly, you would be the same either way, the meters do the same thing and send the same voltage to the ECU. It's all in the way the ECU responds to the voltage. In this case, you would be flowing slightly more air and cause a lean condition b/c the computer would not respond to the additional air correctly b/c it's getting a voltage signal that corresponds to a 55MM volume of air instead of 70MM. If you're getting a dyno tune with it, you'll be fine but it sounds like it will be pointless if the sampling tube in the cobra MAF is as big as what they're saying.

Using a 93 Cobra MAF on a 91 GT???

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