Quote:
Originally Posted by Jawnathin
Great stuff, thanks for posting.
Pardon the silly question, but what is the downforce measured in? Pounds? The unit of measurement wasn't clear.
Can the front bumper of a Miata or 86 support 193lbs without additional support? I figure it would deform the bumper without a brace or some sort.
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Yes it is in pounds. It needs a lot of support to keep from deflecting. This was ran to find the best setup for my friends Miata.
Quote:
Originally Posted by Calum
Excellent info, as always. Just a couple of questions. Why does the coefficient of drag go up from stock to 4in ride height? Is a 4in ride height higher or lower than stock, and by how much?
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The 4in ride height is lower than stock. I do not remember what the stock ride height is honestly. I would have to go into the CAD model to find out. We measured the height on his car, and then I set the 4in ride height based on what he wanted to run ride height wise.
Why does the coefficient of drag go up in test #2 compared to test #1? Basically when the car was lowered, the front bumper interaction with the rotating front tires increased the drag significantly. This interaction wasn't nearly as profound with the car at stock ride height. With the air dams, the flow characteristics changed decreasing the drag by directing air in different locations.
Full Undertray car:
As ride height decreases : usually drag will increase and so will downforce
As ride height increases : usually drag will decrease and so will downforce
Going from a car with no undertray to an undertray, drag will be decreasedand downforce will increase.