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Old 07-14-2017, 06:19 AM   #1
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Intake Air Temperature.

The ScanGauge allows me to display the running Intake Air Temperature. Is there any reason I would want to monitor that, seeing as I have no control over it.
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Old 07-14-2017, 08:14 AM   #2
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Well you may want to compare how it affects your fuel economy, you may get better economy on cooler days. Alot of car manufacturers tend to put the air feed quite close to the engine, presumably so it warms up quicker. But I've seen a lot of people modify the air intake to get a cold air feed.
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Old 07-14-2017, 09:34 AM   #3
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I have always believed that cold air gives better performance and better mileage but hypermilers seem to see better fuel consumption with warm air.
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Old 07-14-2017, 01:06 PM   #4
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The intake is taking air from outside the engine bay, and I have redirected it to take in engine bay air near the exhaust manifold on past cars.

Warm air is less dense, so less of per volume, which means less fuel burned in the cylinder. At least that is the theory, but the only fuel economy benefit could simply be from faster warm times. It does reduce the power output.
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Old 07-14-2017, 03:41 PM   #5
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Warm or hot air intake benefits

Faster warm up
Better atomization
Lower throttle restriction
recycling otherwise lost heat energy

Some cars react well to WAI (warm air intake), others not so much.

Cold dense air is better for power, BUT ONLY TO A POINT. Think 40 below 0 (same temp F or C).

Think 100 degrees. Air density decreases by 25% from the freezing to boiling point of water. Air temp is a useful "displacement reducer" which means more throttle opening for the same power produced = less restriction to intake airflow, lower manifold vacuum.

Take it to the extreme and you could control the intake air flow through temperature alone.

Which is better for economy? Lower manifold vacuum and better atomization is more efficient, particularly in grossly overpowered cars that run normal speeds with high manifold vacuum and lower engine loads.
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