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Three MAF Shootout |
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One of the easiest upgrades on a Mustang is to change out the factory Mass Air Flow Sensor for an aftermarket one. If you believe the claims in the Mustang magazine ads, an aftermarket MAF can add up to 15 horsepower for 20 minutes of work at about $200.00. I was a little more than skeptical, but wanted to see for myself. |
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The Three Contestants |
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The three MAF's that I have tested are in the picture to the right. They are the stock MAF, a Pro-M 75mm Bullet, and a Pro-M 77.
The stock 70mm one came from the factory on my car. It is the same MAF that is on every 94 or 95 5.0 GT or Cobra engine.
The Pro-M 75mm Bullet is not the standard "Bullet" MAF |
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replacement. It is one calibrated for a cold air intake, and it won't fit inside the stock airbox. It is calibrated for 19# injectors. Yes, the 94/5 Cobras have 24# injectors, but the rely on the computer to calibrate the MAF signal for the larger injectors. If you are planning to get a MAF for a 94/5 Cobra, check with the manufacturer;however, as a general rule you will need one calibrated for 19# injectors, if you have the stock 24# squirters. |
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| Why Do Aftermarket MAF's Make More Power? |
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Basically Aftermarket MAF's are superior to the stock one for three reasons:
1. They flow more air. The aftermarket MAFs are bigger and they don't have the restrictive center post like a stock MAF.
2. Aftermarket MAF's have upgraded calibrations. Basically they send a MAF signal to the stock EEC that leans out the air fuel ratio a small amount.
3. Aftermarket MAF's can be calibrated for different sized injectors. If you are stepping up your injector size, you can either buy a MAF calibrated for the new squirters or you can spend money on electronic tuning. |
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| The Shoot Out |
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I ended up with the two Pro-M MAF's from winning bids on eBay. I won bids on both MAF's and the total price I paid was less than the cost of the Pro-M 77 new. Since I had the MAF's sitting around and the removal and installation takes me about 10 minutes, I decided to see which one made the most power with my car's current combination. The engine modifications were minimal at this point: FRPP ceramic coated shorty headers, 13degrees initial timing, a good tune up including a K&N, MSD 8.5mm Superconductor wires, new FoMoCraft spark plugs and distributor cap and rotor, and a Kirban adjustible fuel pressure regulator with the fuel pressure set to stock.
I did the dyno testing at Abacus Racing: (757) 363-8878, www.abacusracing.com, using their DynoJet mobile chassis dyno. The staff there are extremely helpful and are all general car buffs. If you live in the Tidewater area of Virginia or Northern North Carolina, I highly recommend them for any dyno testing you need done.
Basically I paid for 1 hours worth of dyno pulls and the results surprised me. Click the picture below to see which MAF was left standing. |
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HOME |
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