Anyone ever bought a granatelli mass air and had trouble with it? I only ask cause ive been struggling with an idle surging problem and have narrowed it down to what believe is my mass air sensor. I cleaned it which seemed to definitly fix most the idle surging. But im wondering if the type of unit is just crap. Anyone had troubles with them, if so, whats a good aftermarket mass air to get? And i know i have whats called the stock, limited slip posi rear end, so what do i need to intall to make it a full posi? Thanks for any help.
Limited slip and Posi trac are the same thing. I believe one is Ford and the other is GM, but they both do the same thing. You could upgrade the stock unit if your doing alot of drag racing and launching on DR's or slicks, otherwise the one you have is fine. A spool is what turns both wheels at the same time, however it is only used for straight line racing and won't work for street duty. Sorry, can't help with MAF. Usually stock is sufficient unless your pushing alot of hp.
I've been lookig at maybe upgrading my MAF housing, and not all aftermarket ones meter as well as the Ford unit - which can cause mixture problems. I think a stock Fox one is 55mm, while a '94-'95 is 70mm. As far as aftermarket ones go, I think C&L is the best.
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1992 Deep Emerald Green Mustang GT Hatch, 5 speed, 2.73s, Mac fenderwell cold air intake, '93 Cobra MAF, Mac 70mm throttle body & spacer, Explorer intakes, Mac unequal headers & offroad pipe, Magnaflow catback, Walbro 110lph fuel pump, Jet adjustable FPR, MSD Blaster coil, Accel 8mm wires, FRPP aluminum quadrant, UPR firewall adjuster, stock cable, Granatelli upper control arms.
Waiting to go on: Granatelli lower control arms, and GT40 Iron heads!
i dont do alot of dragracing but i was wanting to get a pair of street legal drag tires for the rear to get it to hook up better on take offs. As it is right now i spin the tires all the way up to 3rd gear. Its got the weld draglights on it and my rear tires now are pretty much gone. Id like to convert it back to normal just for the ride and handling. I also have the skinnys up front. But for now i just wanna try some legal cheater slicks. The mass air is calibrated for 30lb injectors. When i get my idle surging, i can pull my mass air plug off, and it'll idle out to normal. I cleaned it and it did alot of good but didnt fix it completely. Ill type out my list of mods, i dont know how much horsepower im pushing.
87 notch 4 cylinder, coverted with an 89gt drivetrain. 302 block, bored to 306, dss pro series pistons, high volume oil pump, E303cam, eldebrock performer rpm heads, 1.6 crane roller rockers, trick flow street heat intake, 30lb injectors, 75mm TB, granatelli mass air, bbk shorty headers, h-pipe, flows,paxton sn series supercharger pushing about 7lbs of boost, for now, looking to get the supercharger upgrades.
i dont do alot of dragracing but i was wanting to get a pair of street legal drag tires for the rear to get it to hook up better on take offs. As it is right now i spin the tires all the way up to 3rd gear. Its got the weld draglights on it and my rear tires now are pretty much gone. Id like to convert it back to normal just for the ride and handling. I also have the skinnys up front. But for now i just wanna try some legal cheater slicks. The mass air is calibrated for 30lb injectors. When i get my idle surging, i can pull my mass air plug off, and it'll idle out to normal. I cleaned it and it did alot of good but didnt fix it completely. Ill type out my list of mods, i dont know how much horsepower im pushing.
87 notch 4 cylinder, coverted with an 89gt drivetrain. 302 block, bored to 306, dss pro series pistons, high volume oil pump, E303cam, eldebrock performer rpm heads, 1.6 crane roller rockers, trick flow street heat intake, 30lb injectors, 75mm TB, granatelli mass air, bbk shorty headers, h-pipe, flows,paxton sn series supercharger pushing about 7lbs of boost, for now, looking to get the supercharger upgrades.
Most aftermarket mass airs are junk and the computer should have a chip burned to match it, the 94-95 5.0 Mass Air is probably the best choice.
so a 94-95 stock mass air would work? Thought a different mass air had to be calibrated for the size injector im using? Can i use a stock 94-95?
The Computer in the car is Calibrated to the Injectors, not the MAF! The 94-95 MAF is 70mm and the Stock Fox is 55mm, you do need a Flange Adapter, but it is a direct plug in and will work with the Stock Computer and the 19Lb. Injectors.
The MAF element can be recalibrated, or reflashed. Or you can compensate with the EEC IV computer itself.
Now, I'm thinking Pro-M is the best.
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1992 Deep Emerald Green Mustang GT Hatch, 5 speed, 2.73s, Mac fenderwell cold air intake, '93 Cobra MAF, Mac 70mm throttle body & spacer, Explorer intakes, Mac unequal headers & offroad pipe, Magnaflow catback, Walbro 110lph fuel pump, Jet adjustable FPR, MSD Blaster coil, Accel 8mm wires, FRPP aluminum quadrant, UPR firewall adjuster, stock cable, Granatelli upper control arms.
Waiting to go on: Granatelli lower control arms, and GT40 Iron heads!
wow, now im really confused. Ok, so the computer is calibrated for the injectors, i thought the computer was self learning when it came to new mods? You said a 94-95 will work with a stock computer and 19lb injectors. Im running my stock computer and 30lb injectors. If its the computer that knows, how come the guys you order from wanna know what size injectors your using then?
Because the MAF element (the black part) is calibrated, or flashed, for a certain pounds-per-hour injector. And, as I learned from shakerhood's link, it's also calibrated for the particular sized housing it's in.
So if you keep your 19# injectors, and change to the '94-'95 MAF housing, you'll want to use the element which came with the newer housing. The one from your 55mm Fox unit will be wrong. I've heard of reflashing the elements for different size injectors, but never heard of one being reflashed to compensate for a different sized MAF housing.
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1992 Deep Emerald Green Mustang GT Hatch, 5 speed, 2.73s, Mac fenderwell cold air intake, '93 Cobra MAF, Mac 70mm throttle body & spacer, Explorer intakes, Mac unequal headers & offroad pipe, Magnaflow catback, Walbro 110lph fuel pump, Jet adjustable FPR, MSD Blaster coil, Accel 8mm wires, FRPP aluminum quadrant, UPR firewall adjuster, stock cable, Granatelli upper control arms.
Waiting to go on: Granatelli lower control arms, and GT40 Iron heads!
i have 30lb injectors in the car, ive had em in there all along, i posted that along with my mods. I also have a granatelli massair unit that was calibrated for the 30lb injectors. Although the actual housing doesnt look much bigger than my old stock housing. I have an idleing problem that seems to resolve itself when i unplug the mass air. What im asking is should i try a different mass air and if so, then what one, mm and type
The element might be fried. Try unplugging the connector, and probing the sensor (with an ohm meter) between MAF SIG and MAF RTN, you should get 10000 ohms. Also probe it between MAF SIG and GND. You want 10000 ohms there too.
It may need cleaning, but I've also heard of Cold Air Intakes causing them to read the air wrong. Some of the MAFs don't like that 90º bend in front of the housing.
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1992 Deep Emerald Green Mustang GT Hatch, 5 speed, 2.73s, Mac fenderwell cold air intake, '93 Cobra MAF, Mac 70mm throttle body & spacer, Explorer intakes, Mac unequal headers & offroad pipe, Magnaflow catback, Walbro 110lph fuel pump, Jet adjustable FPR, MSD Blaster coil, Accel 8mm wires, FRPP aluminum quadrant, UPR firewall adjuster, stock cable, Granatelli upper control arms.
Waiting to go on: Granatelli lower control arms, and GT40 Iron heads!
i have 30lb injectors in the car, ive had em in there all along, i posted that along with my mods. I also have a granatelli massair unit that was calibrated for the 30lb injectors. Although the actual housing doesnt look much bigger than my old stock housing. I have an idleing problem that seems to resolve itself when i unplug the mass air. What im asking is should i try a different mass air and if so, then what one, mm and type
What is happening with the "calibrated" Mass Air Sensor you have is that it is trying to fool the Stock Computer, the Computer only knows so many program maps, its pegging out and causing the poor running. You would have to have your car custom tuned on a Dyno to get things where they need to be.
I cleaned it once which seemed to help, but not cure it. Ill check my it with my ohm meter. Im guessing with a custom tune, it would need a custom chip. Thanks for the help.
granatelli mass air and rear end questions 
