Cold Air Intake or Silicone intake hose (increase gas mileage?) - Smart Car Forums
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post #1 of 6 (permalink) Old 04-25-2011, 08:21 AM Thread Starter
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Cold Air Intake or Silicone intake hose (increase gas mileage?)

I am considering installing one of the "titled" products. I don't want it for increased performance or "growl", I would only consider putting one of these on to increase gas mileage. Those who have installed these there definitely a increase in gas mileage? If so, approximately how much? Looking for facts not hype.
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post #2 of 6 (permalink) Old 04-25-2011, 08:46 AM
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A true cold air intake, in theory, can reduce gas mileage. The colder more dense air causes the computer to richen the mixture to compensate. That being said, I instaled a K&N filter inthe stock air box with a Smart Madness silicone intake tube, and my mileage went up about 2 mpg. Take that as you will.

There have been a couple of members here that have done a "hot air intake mod" to pull the hot air from the engine bay in and have claimed significant increases in mileage because the computer leans out the mixture due to the warm air.

Take this for what you will, I personally prefer my setup.

Good luck with whatever you decide.
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post #3 of 6 (permalink) Old 04-25-2011, 08:53 AM
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The stock resonator is already a "warm" air intake

Just food for thought

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post #4 of 6 (permalink) Old 04-25-2011, 09:31 AM
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You can see my somewhat scientific attempt at measuring the impact of a few modifications to improve fuel economy here:

Fuel economy tricks (0W-30, Iridium plugs, silicone hose, AFE filter)
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post #5 of 6 (permalink) Old 04-25-2011, 10:49 AM
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I've added a CAI to several cars and it usually hurts your city mileage. You'll find yourself revving the motor more to hear the intake. But other then that it will not effect highway mileage. They usually save you some $ in the long run if you use a cleanable filter.
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post #6 of 6 (permalink) Old 04-25-2011, 03:48 PM
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Forge silicone hose, foam replacement filter and Denso iridium plugs will increase the MPG. Learning to drive properly to get good MPG is the hard part, sticking to it when some idiot annoys you is even harder.

Don't use 0W oil unless you live in a very cold climate. Yes you might gain a fraction of a % because less power is used to spin the oil pump because of the lower viscosity but that is only from cold. Viscosity is the same when hot, you shouldn't be putting a load of power through the engine until it is warmed up plus 0W is a warm climate will give you lousy cold start lubrication protection. - The home of 451 mods, fixes, ideas and information.
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