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Old 12-02-2018, 01:01 PM   #141 (permalink)
Cyborg ECU
California98Civic's Avatar
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 5,219

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.37 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
Thanks: 1,859
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Originally Posted by Daschicken View Post
... Someone with previous experience with warm air intakes should chime in, but I expected to see the intake temperature rise fairly quickly. It was 55F outside and I hit 100F coolant temperature before the intake temperature even moved. The highest temperature I saw was 57F over ambient, which is definitely higher than normal, but not by much. My usual scangauge setup does not include the intake temperature, but I have run it before and saw 40-50F over ambient when frequently coasting in neutral. ...
I used dryr hose for my first iteration and then black pvc for the second. Dryer hose will not retain as much of the heat it s exposed to. Relatively thick PVC walls will hold heat, once the car engine gets hot. I think that helps. Also, I drew heat from directly above the catalyst. My upper grill is entirely blocked, my lower grill is maybe 80% blocked, and when I had the WAI still, the remaining airflow was ducted through the cooling radiator. That kept the blast of colder air from washing over the WAI tube and CAT as much, I think. Maybe as a result of these decisions I know I saw a delta greatest than yours right now... maybe 20*F or 30*F.

But my WAI has been disconnected and sitting in my garage for two years. I have been thinking of reinstalling again.


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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