The wing mounts pin to a sturdy chassis mount under the carbon decklid. The wing is mounted as far rearward as NASA rules allowed and below the roofline per NASA rules. The wing is trimmed slightly upward as the air bends downward off the roof and we were trying to reduce separation and to make as little drag as possible. The wing endplates increase wing effectiveness by eliminating spillover at the ends of the airfoil making every bit of it work. A wing can also activate more airflow under the car increasing the effectiveness of a diffuser and other underbody aero.
When the car is at ride height, the rear suspension tucks up and does not mess up the flow to the diffuser as it looks like it might in this picture. This diffuser was made from sheet aluminum with hand tools. A few simple guidelines to make your own diffuser. The safe angle to make a diffuser is 7-10 degrees, any steeper than 10 degrees will result in flow separation from the roof of the diffuser causing it to stall, become turbulent, make drag and lose effectiveness. You can do tricks to keep the flow attached but that’s beyond the scope of this article.
One simple trick we used to keep the flow attached to the diffuser roof is to add vortex generators. since our diffuser is at about the maximum angle before separation normally starts or 10 degrees and we wanted to smooth and straighten the airflow which is a bit turbulent since we don’t have a flat bottom on our car, we have 4 of them, those are the black triangles riveted to the diffuser. You can tell our diffuser works, the dirt that gathers there is in long streaks, not swirls that would indicate turbulent flow. Our diffuser reduces drag as well because the stock bumper hangs down like a parachute, trapping, and pressurizing air. The diffuser stops this from happening by cleaning up the undercar airflow here and makes downforce to boot!