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Air-Temp sensor Question!

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scot w.

GNSperformance.com
Joined
Feb 19, 2005
Messages
8,810
Okay i'm working on something and I have a question for anyone who may know.

"Can the (Air-temp sensor) go AFTER the MAF? or does it have to stay before it for correct readings for the ECM?"




Scot W.
 
I'll stick my neck out

IMO it can go anywhere in the air flow. I have mine in the back of bonnet. I was told by someone who knows that it does very little--mostly trim some timing when outside air is extremely hot.
 
The car isn't going to know where where the Mat is in relation to the Maf, air temp will be relatively the same. Before or after the maf shouldnt matter, before or after the turbo would be a bigger problem.
 
what kind of MAF?

but, yes, it can.

The MAF heats the air slightly, which might throw things off a little at idle. But it should be close enough.

Bob
 
Thanks Guys!

Bob it is a stock MAF..


I was also thinking it can go pretty much anywhere too but I just wanted to make 100% sure before making a hole..



Scot W.
 
I had a dumb idea of wiring in a second ITS sensor at the up pipe to see the deference between before and after the IC.

I would install a 3 way toggle switch and “T” of the OE sensor's wires.
Flip up OE location Sensor
Flip down up-pipe Sensor
And I would just look at the reading on the Scanmaster.
 
I had a dumb idea of wiring in a second IAT sensor at the up pipe to see the deference between before and after the IC.

I would install a 3 way toggle switch and “T” of the OE sensor's wires.
Flip up OE location Sensor
Flip down up-pipe Sensor
And I would just look at the reading on the Scanmaster.

That would be nice to be able to compare like that.
 
If in the stock location and for some reason the sensor comes apart, the MAF screen will prevent the little pieces from making it to the compressor wheel.
 
I had a dumb idea of wiring in a second ITS sensor at the up pipe to see the deference between before and after the IC.

I would install a 3 way toggle switch and “T” of the OE sensor's wires.
Flip up OE location Sensor
Flip down up-pipe Sensor
And I would just look at the reading on the Scanmaster.
Neat idea!

I think that would be a cool little set up indeed. Just think, It would have been cool to see the temp differance between the stock I/C and the ones we run now! :eek: Name the switch "Efficiency"


Scot W,
 
:eek: So I guess I’ll leave that dumb idea of mines on the drawing board.

Plenty of us out there already running with screenless mafs, 4" maf pipes with no screens, etc... not too worried about the air temp sensor breaking apart and making it to the turbo.
 
Plenty of us out there already running with screenless mafs, 4" maf pipes with no screens, etc... not too worried about the air temp sensor breaking apart and making it to the turbo.

Great point.
How would the Pressure affect the accuracy of the sensor?
 
the pressure has no effects on the sensor.


i have my IAT sensor in the back of the doghouse. I did this for the Fast system. but i can also see the exact temp of the air entering the intake runners.


Bob Bailey. Does your chips use the Iat to make any correction in fueling?. I remember yra ago when i did my own chips that looking into the stock acxa chip that there was no corrections based on the iat scaler.

I would think that when using your MAFT-pro it uses it since thats a speed density set-up. i thought the Maf's correct themselves on air temp before sending the signal out.
 
the pressure has no effects on the sensor.


i have my IAT sensor in the back of the doghouse. I did this for the Fast system. but i can also see the exact temp of the air entering the intake runners.


Bob Bailey. Does your chips use the Iat to make any correction in fueling?. I remember yra ago when i did my own chips that looking into the stock acxa chip that there was no corrections based on the iat scaler.

I would think that when using your MAFT-pro it uses it since thats a speed density set-up. i thought the Maf's correct themselves on air temp before sending the signal out.

the stock chip has a MAF compensation table that uses the IAT. The stock MAF is an old design and is not internally temp compesated (or at least not very well)

For the extender chips, this compensation is turned off, as the modern MAFs are internally temperature compensated.

In a speed density control system, the IAT temperature is used in the density calculations.
 
the stock chip has a MAF compensation table that uses the IAT. The stock MAF is an old design and is not internally temp compesated (or at least not very well)

For the extender chips, this compensation is turned off, as the modern MAFs are internally temperature compensated.

In a speed density control system, the IAT temperature is used in the density calculations.



So... for a MAFTPRO equipped car (with extender pro chip), would mounting the IAT after the intercooler be ideal? Uppipe or doghouse? Would the sensor get heat soaked in the doghouse?

And what are the threads on the sensor? I would've though they would be metric, but the best match I could find is 18TPI, indicating it has standard threads, and 5/8" diameter?

Sorry for the barrage of questions, and I hope this falls somewhat in line with the thread discussion!
 
So... for a MAFTPRO equipped car (with extender pro chip), would mounting the IAT after the intercooler be ideal? Uppipe or doghouse? Would the sensor get heat soaked in the doghouse?

And what are the threads on the sensor? I would've though they would be metric, but the best match I could find is 18TPI, indicating it has standard threads, and 5/8" diameter?

Sorry for the barrage of questions, and I hope this falls somewhat in line with the thread discussion!


For speed density, you want to mount it after the intercooler (you are correct)

The doghouse does heat-soak a lot. The intercooler pipe, before the throttle body works well.

The threads are 3/8" NPT (tapered pipe thread)

Bob
 
Thanks Bob, that helps me out tremendously. Hey, if you are still interested in selling those wheels, send me a pic or two when you a get a chance!
 
Well I relocated the Air temp sensor and the car runs fine!

Thanks guy's for your input.




Scot W.
 
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