Diffusers on Grand-Am DSPs

[Dauntless]

H16 criticized DSPs for (among other things) lacking diffusers. I replied that there is nothing in the rules precluding diffusers, and predicted that we would see them by the time the cars take the green at Daytona. Now we have photographic evidence for you to evaluate yourself.

Here is the Multimatic Ford's rear diffuser's treatment. Notice the squared-off diffuser wall to the right of the right side exhaust pipe, as well as the nicely detailed treatment of airflow behind the right tire. (Don't overlook the adjustable spoiler at the rear edge of the aft deck, either.)



And here is the front treatment from the Fabcar Toyota. Cooling air is turned upward to generate downforce as well as cooling the engine water. Don't forget, too, that a properly designed radiator outlet can recover more thrust (by heating and ejecting the air) than it creates drag, thereby adding a small but measurable additional amount of thrust.



And this are just the first iterations...

(Photos blatantly ripped off from www.fastdetails.com)