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Old 05-06-2015, 07:51 PM   #1
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Default N/A intake CAI temperature

What kind of intake temps are you all seeing in N/A applications compared to ambient temperature? I am trying to see how I am doing with my attempt at a CAI.
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Old 05-06-2015, 07:52 PM   #2
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When moving . . . ambient.
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Old 05-06-2015, 08:13 PM   #3
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I'm not even close to that. Could you post pics of your CAI?
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Old 05-06-2015, 08:21 PM   #4
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https://www.miataturbo.net/build-thr...7/#post1129353

Note that my IAT sensor is located in the cold air box.
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Old 05-06-2015, 08:31 PM   #5
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Here is a pic of mine. I have since added some insulation inside of the box and wrapped the intake pipe in radiant barrier. I am seeing roughly 15 degrees higher than ambient.
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Old 05-06-2015, 08:33 PM   #6
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Probably heatsoak of the sensor.
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Old 05-06-2015, 08:36 PM   #7
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Is there really anything I can do about heat soak of the sensor if it is that?
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Old 05-06-2015, 08:39 PM   #8
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Quote:
Originally Posted by blackandtan22 View Post
Is there really anything I can do about heat soak of the sensor if it is that?

Sure, move the sensor. Or insulate it.

For that matter, i notice you have a metric shitload of wiring for that sensor just chilling out near the exhaust manifold.

Have you checked calibration of that thing?
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Old 05-06-2015, 08:54 PM   #9
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Perhaps I am mistaken but thought was told with my Megasquirt I just had to chose GM IAT and all would be calibrated correctly.

I'll look at insulating it better. Thanks.
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Old 05-06-2015, 08:57 PM   #10
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Quote:
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Perhaps I am mistaken but thought was told with my Megasquirt I just had to chose GM IAT and all would be calibrated correctly.

I'll look at insulating it better. Thanks.

Sure. Double check. How do you know if your sensor is accurate?

Does it match ambient when the car is cold and not running?
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Old 05-06-2015, 09:07 PM   #11
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Yes before starting it is roughly at ambient. Just put some thermal barrier around the sensor. Hopefully that helps a bit.
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Old 05-07-2015, 05:55 PM   #12
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2-5F over ambient. No heat soak or hot restart issues. I do my testing by getting the car fully hot and the letting it sit with the hood closed for ~20 minutes so everything heat soaks. Then driving on the highway to see how close the intake temp will get to ambient.

Putting the IAT sensor outside the engine bay helps a lot with sensor heat soak issues.
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