Quote:
Originally Posted by freebeard
Searching on that doesn't turn up any obvious thread. Adding 'vortex' doesn't help. 
It seems like treating only the top one of the four rear sides can't be too effective. Experiments with blown slots ( http://ecomodder.com/forum/showthrea...ots-10972.html, http://ecomodder.com/forum/showthrea...ics-29659.html) suggest
vBulletin doesn't handle links inside quotes very well, I give up.
Different effects for the different sides, all four on for least drag, sides and bottom only for lift; it's not clear what doing the top on only would do. |
Here is the link:
http://ecomodder.com/forum/showthrea...eed-33138.html
Prius C already has VGs built into tail lights. With addition on the roof you could say that all rear end above waist line is treated.
I haven't had high expectations on VGs, but they were cheap (set for $12 total) to try. The idea was not to improve car aerodynamics, but to improve performance of existing aero devices on the car. As Prius C has the spoiler alone trailing edge, VGs installed ~12" in front, angled at 22deg seem to improve its performance.
Also I would not read too much into 7%, there are likely some other factors at work. Looks like Prius C had been optimized for lower speeds, so slight decrease in aerodynamic drag could have resulted in much higher MPG gain.