[California98Civic]

Tested my re-designed WAI this morning, and here are the results:

A = no WAI
B = WAI

A1 50.8 mpg
B1 51.8 mpg
A2 50.8 mpg
B2 52.1 mpg
__________
= +1.15 mpg on ave.

My route was an 18.5 mile freeway loop, around which I held the throttle at 16.1% consistently. No significant wind this morning. I warmed the car and tires over 25 miles to the course. Each nearly closed loop had me at speed and in throttle position when I reset the trip gauges on my Ultra Gauge.

I tracked other data too:

A1: 55.6 mph; .37 gal fuel; peak IAT 96.6F; g/h 1.10 (50.8 mpg)
B1: 54.6 mph; .36 gal fuel; peak IAT 116.4F; g/h 1.05 (51.8 mpg)
A2: 55.6 mph; .37 gal fuel; peak IAT 104.4F; g/h 1.10 (50.8 mpg)
B2: 54.9 mph; .35 gal fuel; peak IAT 120.0F; g/h 1.05 (52.1 mpg)

I am satisfied that it works, though clearly the impact is modest though significant.

WAI design: [EDIT: I redesigned the WAI to use dryer hose, which has the advantage of being easily repositioned if the intake air is too hot or too cold--and for different seasons.] My WAI extends from the stock 1998 Civic air filter box over the motor to reach the exhaust manifold at the front, behind the radiators. The WAI is made of black PVC type plumbing tubing. I chose it because it gets hot and therefore keeps the air warm while it travels to the intake. Around the intake opening, just above the manifold, I have a temporary "box" (made of aluminum foil and duct tape!). The box is open only at the top, up against the black hood, and has the purpose of reducing cooler air entrance into the intake when the car hits highway speeds. I run grille blocks too.

My car has a MAP sensor.

I'm going to keep my WAI. It seems to work. But sometime I'll want to test a CAI against it.