Quote:
Originally Posted by California98Civic
Reviving this old thread for a question. I read the image below to mean that the most advantageous angle for my rear diffuser is about 4* or slightly less, since I am starting at about the rear axle. My question is how do I judge measure the angle I accomplish reasonably precisely? EDIT: maybe go to my favorite flat spot, park, and use a level to judge the ground and a "quick square," such as this one, to judge the angle? (I have never laid my hands on a "quick square" but a neighbor friend might have one I can borrow). I really have no idea, so maybe I'll just give it my best guess.
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*You do need to be on a flat level surface
*You should have 300-lbs of ballast in the front seats so the car will have its 'driving' inclination
*Locate the spot where your diffuser will begin
*Measure its elevation above the ground
*Then measure back to where the diffuser will terminate to get your horizontal distance,your 'run.'
*If you have a scientific calculator,you can use the trigonometric function to get your dimension multiplier
*If say,you do use 4-degrees,enter: 4 tan,to get 0.069926.
*If you multiply your 'run' dimension by this value,it will give you your 'rise' at the back of the diffuser for 4-degrees.
*This will be the exact distance above your original starting elevation for the rear of the diffuser,to get your 4-degree slope.
