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Old 01-13-2012, 09:07 AM   #5 (permalink)
Cyborg ECU
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Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,297

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
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Originally Posted by Daox View Post
A cold air intake may help increase mileage on a diesel engine, but not a gasoline engine.
On a Civic of the age of ours, because of the intake manifold sensor type it uses (MAP not MAF), I agree a WAI will help FE modestly. Here were my test results with my WAI on my 1998 Civic. I totally see the value of just using PVC plumbing pipe. That is how I built mine for just a few bucks. Maybe Daox will correct me, but I thought nobody here had yet ABA tested a CAI to see what it might do. Still, I would agree with him that the CAI will probably not help for the simple reason that a CAI is supposed to add more dense air to the air/fuel mix and therefore get the ECU to increase fuel in the mix, no? If so, you would use more fuel and increase pumping losses, no? Anyway, a WAI is easy to build. Mine is black PVC pipe from the stock filter housing to a spot over the exhaust manifold (HOT air).

Good luck!
See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.

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