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California98Civic · 01-30-2012, 08:09 PM

Following advice on this forum about WAIs and CAIs I redesigned mine, and I am already considering another rebuild.

The photo below is of my new set-up. All the stuff was either stock or laying around my garage (so cheap and easy). The pipe running from the airbox toward the head is the WAI and the other, running down toward the transmission on your left is the "CAI". When I plug the CAI air comes in through the WAI, plug the WAI and it comes in through the CAI. And I can reset the stock setting in about 1 minute (for smog check). I just tested the effectiveness today. With the car thoroughly warmed and running for 15 miles I ran the WAI, then CAI, the WAI settings ABA:

A=89.7, B=82.1, A=94.3 (degrees fahrenheit)

So I am happy. Today was only mildly warm (in the 60s).

Question: I think I may be reducing the effectiveness of this mod for FE by restricting the airflow with a slightly smaller than stock diameter snorkel. The stock setup seems to be a little under 2" diameter and the piping I use is 1.5" diameter. Anybody think this could be significantly counterproductive since the WAI is supposed to save on pumping losses as well as help fuel atomization a little?

01-30-2012, 08:09 PM	#1 (permalink)
California98Civic Cyborg ECU Join Date: Mar 2011 Location: Coastal Southern California Posts: 6,299 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: 2,373 Thanked 2,174 Times in 1,470 Posts	WAI/CAI switching and snorkel size Following advice on this forum about WAIs and CAIs I redesigned mine, and I am already considering another rebuild. The photo below is of my new set-up. All the stuff was either stock or laying around my garage (so cheap and easy). The pipe running from the airbox toward the head is the WAI and the other, running down toward the transmission on your left is the "CAI". When I plug the CAI air comes in through the WAI, plug the WAI and it comes in through the CAI. And I can reset the stock setting in about 1 minute (for smog check). I just tested the effectiveness today. With the car thoroughly warmed and running for 15 miles I ran the WAI, then CAI, the WAI settings ABA: A=89.7, B=82.1, A=94.3 (degrees fahrenheit) So I am happy. Today was only mildly warm (in the 60s). Question: I think I may be reducing the effectiveness of this mod for FE by restricting the airflow with a slightly smaller than stock diameter snorkel. The stock setup seems to be a little under 2" diameter and the piping I use is 1.5" diameter. Anybody think this could be significantly counterproductive since the WAI is supposed to save on pumping losses as well as help fuel atomization a little? Attached Thumbnails __________________ 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. Last edited by California98Civic; 01-31-2012 at 12:14 AM..