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Old 12-02-2018, 12:01 PM   #141 (permalink)
Cyborg ECU
California98Civic's Avatar
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,059

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)
Thanks: 2,285
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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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Old 12-06-2018, 02:45 PM   #142 (permalink)
EcoModding flying lizard
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Join Date: May 2012
Location: Georgia
Posts: 724

Cibbie - '88 Honda CBR 250R
90 day: 51.09 mpg (US)

Rarity - '06 Honda Accord EX V6
Team Honda
90 day: 37.04 mpg (US)

Baby viff - '86 Honda VFR 400R
90 day: 42.15 mpg (US)

Latios - '08 Suzuki SV650SF
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Well, I know for sure it works now. In stop and go traffic with 32F ambient temperature I saw as high as 155F. On the move, the temperature was more like 130F. Definitely not going to be suitable for summer use! Traffic prevented me from getting an idea on the improvement it makes.

The dryer hose warm air intake was a failure on this car. I never saw improved mileage, likely due to the cooling fan running a lot even with normal coolant temps. I think the ECU interprets intake temperature as engine bay temperature, and runs the cooling fans if it sees a large temperature difference between outside and intake temps. Might be able to address this by exposing the outside temperature sensor to hot temps too, but I really don't feel like doing this again.

-Kaze o tatakaimasen-

Best trip in V6: 52.0
Best tank in V6: 46.0
Best tank in CBR: 61.3
Best tank in VFR: 62.5
Best tank in SV: 83.9

Originally Posted by MetroMPG View Post
You can lead a fashion-conscious horse to unusual-looking water...

Last edited by Daschicken; 10-01-2019 at 01:35 PM..
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