I'm thinking of making an air dam for my Canyon. The factory air dam is made of brittle plastic held together with Gorilla tape, and I like to think that I could make something that would work better than the factory air dam. So I started by looking at the air dam on a 2014 Chevrolet Silverado.
The center portion is 1 to 1.5 inches higher than the oil pan:
The outer portions extend down about 1.5 inches below the center portion to about even with the bottom of the front suspension:
They also have little air dams in front of the rear wheels:
The tires on this truck are P265/65R18. Does anybody know if that's a base size, or an optional larger size? Both the front and rear tires extend about an inch beyond the front and rear air dams. If I build an air dam for my Canyon, should I make it like this Silverado air dam, or should I make it extend out even with the outer sides of the tires? Can I assume that the Silverado air dam is the best design for a pickup truck air dam, or should it really be an inch or so lower in the middle? I'll be using conveyor belting, so it's OK if it scrapes occasionally.
Ideas? Suggestions?