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Originally Posted by caferacer51
I'm looking at making a single piece bolt-on air dam/deflector.
So, question is, which angle will best assist with airflow in relation to economy?
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The air dam reduces the amount of air going underneath the car, at the expense of more frontal area, pushing it over or to the sides of the car.
In order to do so, it must sort-of retain the air, rather than allowing it to spill underneath the air dam. That's why you'll often see the lower lip of a front spoiler being angled forward, or a horizontal splitter plate on race cars.
So, don't angle it rearward.
Follow the curve of the front bumper so it guides the air to the sides.
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2. Block airflow to the massive gapping hole in the bumper
(4. Retain some aesthetic appeal...)
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You can do so by blocking it from the inside.
Test with something that can easily be removed, see what works as it'll still need some air, then make it more permanent / stealthy on the inside.
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3. Push air out and passed the wheels
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If still possible, as the car already seems to ride low, you can lower the air dam further in front of the wheels - if the air dam is close to the wheels at this point.
The further it is from the wheel, the less effect it'll have.