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post #3811 of 3817 (permalink) Old 05-28-2019, 02:39 PM
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.......That's odd...IAT should be pretty close to ambient ........
When the car is stationary the air at the intake will get hotter simply because there is no movement. Once there is some forward velocity the temperature will quickly drop to ambient.

When we were testing to decide whether a CAI was of any use we instrumented the underhood area with thermocouples and found that there was quite a bit of extra heat at the intake until about 30 MPH, then it went away.

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post #3812 of 3817 (permalink) Old 05-28-2019, 06:03 PM
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Originally Posted by JohnWR View Post
When the car is stationary the air at the intake will get hotter simply because there is no movement. Once there is some forward velocity the temperature will quickly drop to ambient.

When we were testing to decide whether a CAI was of any use we instrumented the underhood area with thermocouples and found that there was quite a bit of extra heat at the intake until about 30 MPH, then it went away.
But wouldn't the IAT 2 suffer the same issue?


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post #3813 of 3817 (permalink) Old 05-28-2019, 07:10 PM
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But wouldn't the IAT 2 suffer the same issue?
The intercooler seems to take care of that. My IAT2 was very steady for my short drive as a little above ambient.
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post #3814 of 3817 (permalink) Old 05-28-2019, 07:15 PM
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But wouldn't the IAT 2 suffer the same issue?
It would, but not as severely as IAT 1. IAT 1 is going to directly reflect the temperature at the intake, which is effectively underhood temperature when the car isn't moving. IAT 2 is going to be tempered by the thermal mass of the IC which is more exposed to ambient air and is likely to also see some airflow from the fan.

The key here is how long the stop lasted, and how much the temperatures actually changed.

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post #3815 of 3817 (permalink) Old 05-29-2019, 10:37 AM
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Originally Posted by JohnWR View Post
It would, but not as severely as IAT 1. IAT 1 is going to directly reflect the temperature at the intake, which is effectively underhood temperature when the car isn't moving. IAT 2 is going to be tempered by the thermal mass of the IC which is more exposed to ambient air and is likely to also see some airflow from the fan.

The key here is how long the stop lasted, and how much the temperatures actually changed.
Interesting. I never really get to compare the two since with the conversion I effectively only have IAT2...


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post #3816 of 3817 (permalink) Old 11-26-2019, 10:27 PM
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post #3817 of 3817 (permalink) Old 11-28-2019, 12:14 PM
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