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Old 06-21-2009, 11:49 AM   #14 (permalink)
stevey_frac
EcoModding Apprentice
 
Join Date: Jun 2008
Location: Cambridge, ON
Posts: 240

Jalilah - '07 Chevrolet Cobalt LT
90 day: 40.57 mpg (US)
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Quote:
Originally Posted by max_frontal_area View Post
why are you preheating your intake air, is the AT 30f below?
Hot air does two things: It lowers the density of air, meaning you have to have your throttle more open to to get the same mass of air, which reduces pumping losses.

It also increases the temperatures of the air going in. Now i know that's obvious, but it's important. Most thermodynamic cycles improve efficiency at higher temperatures.
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