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Old 08-21-2003, 03:00   #1 (permalink)
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Maf ???????

I have been reading the posts lately and when people are asking about XR8 mods there is the usual throttle body, heads etc.... but also the MAF. what is this MAF what does it stand for and what does it do. I know it probably sounds like a dumb question but i am used to the old carby engines.

Cheers
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Old 08-21-2003, 03:08   #2 (permalink)
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Not a dumb question at all, basically the Mass Air Flow meter is used by the ECU to determine literally the mass of air flowing into the engine, therefore helping it (the ECU) to compute spark and fuel requirements based on this and other sensor inputs. I hope this makes sense, let me know if I haven't explained this well enough.
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Old 08-21-2003, 03:14   #3 (permalink)
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nah u explained it well. i always just called it the air flow meter hahahahahaha

thanks mate
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Old 08-22-2003, 13:27   #4 (permalink)
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Re: Maf ???????

It works by heating a wire to a constant temperature above ambient. The air entering the engine cools the wire, requiring an increase in current to maintain the temperature difference. This increase in current causes a voltage drop across a resistor in the control unit to change. This voltage drop is amplified and sensed by the ECU. The voltage output of the sensor is proportional to the mass (rather than the volume) of air entering the engine.

Just think, if LA hadn't been smog bound in the 70's, we problably would not have all this high tech anti smog gear on our cars.

California is the biggest domestic car market in the States, and so when they passed all their anti-smog laws in the mid-late seventies, the car makers had to lift their game. And so ended the glorious era of the 70's V8 muscle cars.

And with it came recommendations for lighter engine oils, which were more for gas mileage than engine protection.
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Old 08-22-2003, 19:20   #5 (permalink)
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thanks TopGhia, 10 points to you. hahaha.
u can never know to much

Cheers
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Old 08-23-2003, 14:18   #6 (permalink)
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Re: Maf ???????

Thanks for saying thanks. If anyone is running one of those oiled up air filters (K&N etc), cleaning the MAF is the first job to do when the engine loses performance or otherwise plays up.

happy motoring.
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