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I'm also interested in doing this type of testing although I'm too cheap so I'll probably just make a water manometer. I found the article "Ultimate DIY Automotive Modification Tool-Kit, Part 3" on autospeed.com (can't like yet) provided a good basis on how to do pressure testing although I'm also still looking for some more information if anyone has some. Like for say are we looking for just a reduction in pressure or pressure over area.
To my (limited) understanding a pilot tube is only used for measuring "dynamic" fluid velocity instead of pressure. I think we are more interested in pressure, as in the negative or positive pressures that generate most of our drag. To measure pressure the tube should be perpendicular to the flow (as seen in the autospeed article). I think the air dynamic pressure would only be used if you want maybe determine airspeed before one of your modifications (IE placed in front of it on the car) to determine how the mod should be made.
P.S. First post, Hi everybody!
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