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Old 03-15-2016, 06:51 AM   #1
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Default Measuring heatsoak vs actual AIT?

I was at the track on the weekend doing some datalogging and saw some AIT's of 180odd fahrenheit. I really wonder if this is accurate.

On the dyno I dont see these numbers so I want to know how to accurately test AIT and eliminate heatsoak. The sensors are in stainless or alloy tubes right before the throttle. Regular GM sensors.

Can I dangle a sensor in the pipe or something to eliminate any chance of heatsoak? Run a hose over the pipe?

Pls help me get accurate AIT data.

Thanks,
Dann
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Old 03-15-2016, 08:23 AM   #2
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Run a thermocouple into the intake and compare?
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Old 03-15-2016, 08:26 AM   #3
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Originally Posted by ryansmoneypit View Post
Run a thermocouple into the intake and compare?
So how can this be done @>20psi, 7500rpm?

Dann
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Old 03-15-2016, 08:30 AM   #4
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A really tight fitting rubber plug with a tiny hole for the wire. Cram the plug in as tight as you can, then trust it a few times, so the tube cuts into it and holds on.
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Old 03-15-2016, 08:32 AM   #5
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180F. Your IC is broken.





I'm going to say this for the 10,000th time: STOP PUTTING AIT SENSORS RIGHT BEFORE THE TB SO YOUR HOT *** RADIATOR *RADIATES* +200F OF FURY ALL OVER THEM.

seriously, if I could enforce it, I'd make it illegal and fine/jail all offenders on this site.


move your AIT bung to your IC endtank.



But, with that being said, if this is while driving, I'd trust the readings. So long as you have airflow over the sensor element, it's going to report back fairly actual temps. Sounds like your IC is severely undersized/poorly designed for your application.
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Old 03-15-2016, 08:34 AM   #6
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The throttle body intake elbow houses the IAT sensor and its right behind the 210* radiator.

Dann
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Old 03-15-2016, 08:36 AM   #7
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Originally Posted by ryansmoneypit View Post
A really tight fitting rubber plug with a tiny hole for the wire. Cram the plug in as tight as you can, then trust it a few times, so the tube cuts into it and holds on.
Just go to an electronics store and do what you say and wire it to the ecu and go racing?

Dann
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Old 03-15-2016, 08:43 AM   #8
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N/A miatas can see well over 190-200F intake temps

This is why someone invented this thing called a cold-air intake, to source air outside the hot-*** engine bay.
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Old 03-15-2016, 08:48 AM   #9
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Its turbo. It has an intercooler.

Quote:
Originally Posted by nitrodann View Post
So how can this be done @>20psi, 7500rpm?

Dann
How do I test?
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Old 03-15-2016, 08:52 AM   #10
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Quote:
Originally Posted by nitrodann View Post
Just go to an electronics store and do what you say and wire it to the ecu and go racing?

Dann
If your set on not moving it, then yeah. Put a harbor freight cheapo multimeter with a thermo couple and a rubber plug. It's 20 psi, not 120.

30 bucks worth of science equipment.
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Old 03-15-2016, 08:54 AM   #11
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Maybe it's a top mount intercooler.
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Old 03-15-2016, 09:00 AM   #12
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Quote:
Originally Posted by ryansmoneypit View Post
If your set on not moving it, then yeah. Put a harbor freight cheapo multimeter with a thermo couple and a rubber plug. It's 20 psi, not 120.

30 bucks worth of science equipment.
Is this, or is there, an industry standard way to do this?

Best idea so far, it was all I could think of also.

Dann
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Old 03-15-2016, 09:29 AM   #13
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Certainly not an industry standard, I'm sure. But this is how I measured the air temp output on an air compressor. In this case, I had a steel pipe. Drilled a hole in the plug, dangle the probe wire in the airstream (don't touch the pipe wall) RTV, and done. This didn't leak at 120 psi.
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Old 03-15-2016, 09:32 AM   #14
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Champion, thanks.

Dann
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Old 03-15-2016, 10:16 AM   #15
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Quote:
Originally Posted by Code Monkey View Post
Maybe it's a top mount intercooler.
Mazdaspeed 3/6 style
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Old 03-15-2016, 10:22 PM   #16
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Originally Posted by Braineack View Post
180F. Your IC is broken.
Really though, is 180F not feasible for a heat soaked intercooler, on track @ 20psi?

I feel like that could be possible especially if ambient temp is 80-90 outside.

Or still would that just implicate a crappy intercooler?
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Old 03-15-2016, 10:57 PM   #17
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Quote:
Originally Posted by slmhofy View Post
Really though, is 180F not feasible for a heat soaked intercooler, on track @ 20psi?

I feel like that could be possible especially if ambient temp is 80-90 outside.

Or still would that just implicate a crappy intercooler?
It was 95f, 22psi.

I can't answer any of your questions but id like to.
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Old 03-16-2016, 12:18 AM   #18
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Quote:
Originally Posted by nitrodann View Post
I was at the track on the weekend doing some datalogging and saw some AIT's of 180odd fahrenheit. I really wonder if this is accurate.

On the dyno I dont see these numbers so I want to know how to accurately test AIT and eliminate heatsoak. The sensors are in stainless or alloy tubes right before the throttle. Regular GM sensors.

Can I dangle a sensor in the pipe or something to eliminate any chance of heatsoak? Run a hose over the pipe?

Pls help me get accurate AIT data.

Thanks,
Dann
Test your sensor. I run a GM open element sensor. On mine, I can have the car running at idle, and heat the end of the sensor with a heat gun and it doesn't change the readings. Because the element is measuring the air temp in the pipe, not the body of the sensor. I keep my sensor close to the intake manifold since heat soak doesn't affect it much. When the ait sensor is showing say, 30*F over ambient, I can grab the IC pipe and yeap, it's warm. Put it on the highway and both drop close to ambient.

Just test and see if heat soak changes the readings.
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Old 03-16-2016, 12:35 AM   #19
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So heat the whole sensor, then remove the heat gun and see if.it registers atmospheric?

Sounds like an easy and good test.
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Old 03-16-2016, 12:38 AM   #20
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Quote:
Originally Posted by nitrodann View Post
So heat the whole sensor, then remove the heat gun and see if.it registers atmospheric?

Sounds like an easy and good test.
Try it. On my car I used a heat gun, AIT sensor, and infared temp gun on a black pipe.

With the SC, if I let it heatsoak at idle, the AITs dropped if stomped it and went into boost, as there was a rush of cool air from the intercooler that cooled everything down. AIT sensor would show this, and infared temp gun/hand test confirmed it too.
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