Quote:
Originally Posted by 13B_88FC
I'm not sure I quite buy that. An engine that is already at an operating temperature of 200 degree or more is not going to have problems igniting the charge from a "cold air" intake because by the time is actually gets to the engine, it's plenty warm. Maybe this wouldn't be true if temps are down below say 40 degrees, but still I'd have to see really solid data showing good gains to believe this is beneficial.
Cold air intakes are good for both power and mpg. A denser charge is a good thing.[Citation needed]
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My Prizm has seen a 4 MPG boost from the WAI and my average temperature is in the 70's.
When I put the CAI back on, I see it drop back down to 33 MPG.
Half the problem is that the engine has a hard time getting up to operating temperature quickly.