Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Has there been any experimentation with redirecting window/sunroof air to the rear?

Cd · 03-14-2015, 10:04 AM

I've wondered the same thing too. I did a really sloppy CFD test with the sunroof open, and then later with the back windows and rear window down.

IIRC, all tests showed an increase in drag.

And then there is the issue of crowding the cabin with ducting. The idea seems feasible though. Thanks for posting.

There was a post or two on that topic here before BTW.

03-14-2015, 10:04 AM	#2 (permalink)
Cd Ultimate Fail Join Date: Feb 2008 Location: Austin,Texas Posts: 3,585 Thanks: 2,872 Thanked 1,121 Times in 679 Posts	I've wondered the same thing too. I did a really sloppy CFD test with the sunroof open, and then later with the back windows and rear window down. IIRC, all tests showed an increase in drag. And then there is the issue of crowding the cabin with ducting. The idea seems feasible though. Thanks for posting. There was a post or two on that topic here before BTW.