Quote:
Originally Posted by oldtamiyaphile
Yes, but Autospeed's tuft testing showed attached airflow on the rear window of a sedan after installing VG's.
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Yeah, that is true. BUT this is the conclusion of that study: "On the basis of the scientific evidence that is available, and the results of this test, we very much doubt whether vortex generators fitted to the trailing edges of vehicles will reduce drag."
They argue that VGs energize the boundry layer and creates more attached flow, but they do not conclude that VGs reduce drag at the steeper angle that the trailing edge offered. And the car they used, a GEN 1 Prius, arguably had a much better angle on the rear glass than this 2007 Malibu. Considering the steeper edge, I'd suggest avoiding the VG tuing for this application.
AutoSpeed - Blowing the Vortex, Part 4