Quote:
Originally Posted by California98Civic
You might experiment with leaving the inner third of the holes open to imitate wheel designs that sometimes perform about as well or better than fully covered wheels in wind tunnel tests. More brake cooling would be a side benefit, but the main purpose of retaining a small opening seems to be reducing wheel well ventilation drag. No guarantee it works better for you, and no real precise way to test whether it works better for your car, given our equipment. But if you like the look better...
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I recently discovered that the brakes are mainly cooled by a guided airflow underneath the car. But that air has to leave the wheel somewhere. Now the wheels are closed with tape, so the airflow seems disrupted and has to go back in the wheel well and find another way out. See the picture below. It's difficult to test this.
