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Since I saw virtually no change in my drag numbers I probably won't pursue the air dam idea any farther. I might consider adding some covers to the bottom of the car, but like I said before the bottom is very clean now. I'm thinking that once the air starts under the car it stays smooth since nothing is hanging down to disrupt it. I have added tar paper flaps under the rear axle to keep the air going past that, and I don't think that helped either. It is a cool idea in that the axle can move up and down without ripping the tar paper, so the bottom stay relatively smooth even though the suspension moves. One nice thing about an electric car is that I can measure the power used through my controller. It can log volts, amps, RPM, etc every .2 seconds. From that I can compute power and speed. The hardest part is trying to hold the speed constant. Any slight acceleration shows up in logs as additional amps. Also driving on what you think is a level road changes the power values drastically. Very slight uphill or down hill sections show up as huge changes in power at a certain speeds.
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