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Old 06-02-2004, 09:15 PM   #1
scubydrew
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Default air intake temp

does anyone know if the 96 impreza maf has a air intake temp sensor in it? i'm in the middle of trying to wire in link and don't know if i need to get a air/temp sensor or i can tap it off the maf. thanks
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Old 06-03-2004, 12:07 AM   #2
Drac9
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It might have one but then you have to leave the maf in there, which seems lame if you are only using it to measure intake air temp. I think you would need to power it as well.. It's easier just to buy the GM one and wire it in.
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Old 06-03-2004, 02:12 AM   #3
Unsung Boxer
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im not sure, because Subaru uses a 3 wire MAF sensor, of which one is ground, one is refrence, and one is signal.

That being said, i dont see where the intake air temp circuit could run seperately.

It is a Hot-Wire system. The first heats up, the second detects air temp, and puts out a voltage, the ECU then reads the difference. This is the point of the Hydra. It uses a MAP sensor and pre-determince figures to determine what a "maf" output should look like.

Good question, sorry i dont know exactly how to answer it.

-Jake
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Old 06-03-2004, 02:59 AM   #4
subiekid
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hmmm, that is interesting, i never thought that the car would have an air temp sensor from the factory. The tec 3 came with one. Just need to get the ic tapped for it. i think they are fairly cheap. i have hte part number if you want it.
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Old 06-03-2004, 08:22 AM   #5
Drac9
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The 2000 and up cars have an air temo sensor built into the map sensor.
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Old 06-03-2004, 11:48 AM   #6
Unsung Boxer
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see, w/ MAP sensor its a good idea to have air temp, that way it can see air pressure and temperature, and change A/F based on that.

w/ MAF, air temperature directly affects air flow. The first wire creates refrence voltage, the second one sees how much heat is being taken away as air flows by it. So its not really air temp, its refrence.

-Jake
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Old 06-03-2004, 09:55 PM   #7
no-coast-punk
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MAF sensors measure air temp. indirectly. There is a circuit in the sensor itself to maintain the wire at a specific temp. If you have a little bit of cool air, or alot of hot air the temperature drop on the film/wire, and the current required to bring it back up to the specified temperature will be the same. It measures density indirectly this way because a little bit of cool air or alot of hot air will have the same oxygen content. Due to the fact that temperature (and the tendancy to detonate) can't be directly measured, this is why the subie MAF ECU's have such agressive and fast spark advance/retard mechanisms.
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