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Old 11-28-2007, 12:04 AM   #1 (permalink)
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Mercedes C Class patented ventilated tail lights

aw this on Fifth Gear and went straight to the web to find out more...



High pressure air from under the car is vented at the leading edge (side) of the tail light assemblies.

Apparently this accomplishes 2 things:

1 - relieves under car pressure, reducing lift and eliminating the need for a deck lid spoiler

2 - interacts with the flow at the transition at the rear of the car in a way that reduces turbulence, reducing drag.

The car has a decent (for modern production cars) cd of 0.27.



More info:

http://www.autoblog.com/2007/02/09/m...ted-taillights

http://www.worldcarfans.com/rsslink....ed-tail-lights

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Old 11-28-2007, 12:06 AM   #2 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 21,653

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 53.78 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 66.29 mpg (US)
Thanks: 3,399
Thanked 6,211 Times in 3,218 Posts
Is it possibly just marketing hype?

Maybe.

But they do claim 0.27. So there is some proof in their pudding. Though how much the vents contribute isn't stated - and there's still piles of room for improvement, and not just this incremental stuff we're seeing.

The number of current production cars with a Cd of .27 is small.

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Ecodriving test:
Manual vs. automatic transmission MPG showdown



EcoModder
has launched a forum for the efficient new Mitsubishi Mirage
www.MetroMPG.com - fuel efficiency info for Geo Metro owners
www.ForkenSwift.com - electric car conversion on a beer budget
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