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Old 01-16-2013, 01:24 AM   #1 (permalink)
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Mercedes CLA sedan: 0.23 drag coefficient (0.22 for BlueEfficiency model)






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Old 01-16-2013, 02:34 AM   #2 (permalink)
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From the MB press release:

Quote:
(Wind) resistance is futile - a new record Cd figure

With a Cd figure of 0.23, the CLA sets a new benchmark among not only Mercedes models, but also all series-production vehicles. The frontal surface area, Cd x A - which is crucial to aerodynamic resistance also leads the field at 5.49 sq. ft.

The good air flow characteristics, which have a major impact on fuel consumption under everyday driving conditions, are the result of extensive aerodynamic optimization. These include
  • a low A-pillar shoulder with adapted A-pillar geometry,
  • aerodynamically optimized exterior mirrors,
  • low-drag wheel trims
  • and serrated wheel spoilers on the front and rear wheel arches.
  • Extensive underbody cladding,
  • additional cladding at the center of the rear axle,
  • an aerodynamically optimized muffler
  • and a diffuser improve the flow of air beneath the underbody.
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Old 01-16-2013, 03:35 AM   #3 (permalink)
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Amazing! I guess that explains how the base CLA can crack 130 mph with just 122 hp and 150 with the two liter.

This is one Merc I can't wait to test-drive. After the horribly plasticky B-Class, it's nice that Mercedes is trying to find ways to go mass market (read: FWD) without losing its premium appeal.
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Old 01-16-2013, 04:01 AM   #4 (permalink)
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Quote:
Originally Posted by MetroMPG View Post
From the MB press release:
And that trunk probably doesn't even hit template. Shows how the details can add up!
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Old 01-16-2013, 10:51 AM   #5 (permalink)
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Yup: detail optimization can make up for a lot. Tells us how bad the "details" must be on most cars, doesn't it?
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Old 01-16-2013, 11:27 AM   #6 (permalink)
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The brochure is fascinating reading.
http://www.mercedes-benz.fi/content/...7_0113_021.pdf
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Old 01-16-2013, 11:36 AM   #7 (permalink)
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Wow - .22 for the high efficiency model, coming later. Editing the post title.

From the PDF:

Quote:
Aerodynamics have never looked better ... The result is a perfectly structured whole whose aerodynamics are unmatched in the series-production car sector.

Cd value of 0.23 (0.22 for CLA 180 BlueEFFICIENCY Edition expected to be available from 2nd quarter of 2013) is the lowest for any series-production vehicle
Quote:
The impressive aerodynamic qualities of the new CLA ensure that it offers only slight air resistance, not just in the wind tunnel, but on the road, too. As a result, the expressive exterior design is accompanied by a Cd value of 0.23 – an outstanding achievement among series production vehicles and one which is second only to another model in the new CLA line-up: the CLA 180 BlueEFFICIENCY Edition (expected to be available from 2nd quarter of 2013) has a Cd value of just 0.22 thanks to the use of additional innovative technology.

How do you benefit from this? The optimised airflow around the vehicle plays a major role in achieving the measurable reduction in drag. The positive effects extend beyond a reduction in fuel consumption: low lift coefficients at the front and rear wheels make for agile handling, good driving stability at higher speeds and an assured response to crosswinds. The outstanding aerodynamics also make themselves felt inside the vehicle
where wind noise is reduced to a level unmatched in this category. All of which goes to show once again that, rather than being an end in themselves, good aerodynamic characteristics have lasting benefits in many different areas.
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Honda mods: Ecomodding my $800 Honda Fit 5-speed beater
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Ecodriving test: Manual vs. automatic transmission MPG showdown



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Old 01-16-2013, 12:15 PM   #8 (permalink)
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Funny, I have been noticing the Merc sedans lately.
Noticing how low the front edge is to the ground and how low the front hood is to the ground.
also how 'tight' the tires and wheels are to the edges of the wheel well.
Usually a sedan's bumber will clear a curb. Butthe newer merc arent high enough.
As Metro said....'opitmizing the details"!
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ECO MODS PERFORMED:
First: ScangaugeII
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Second: Grille Block
http://ecomodder.com/forum/showthrea...e-10912-2.html

Third: Full underbelly pan
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Fourth: rear skirts and 30.4mpg on trip!
http://ecomodder.com/forum/showthrea...tml#post247938
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Old 01-16-2013, 12:30 PM   #9 (permalink)
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MB

Quote:
Originally Posted by MetroMPG View Post
From the MB press release:
MB proabably lurking here at ecomodder? How bout the belly?
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Old 01-16-2013, 12:53 PM   #10 (permalink)
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Just as a reminder, Merc was the first to do 0.24 in a production car, just a few years ago:

http://ecomodder.com/forum/showthrea...html#post88383

And they seem to be getting closer to their goal:

Mercedes to Sell Super-Aerodynamic Cars in 5 Years

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Project MPGiata! Mods for getting 50+ MPG from a 1990 Miata
Honda mods: Ecomodding my $800 Honda Fit 5-speed beater
Mitsu mods: 70 MPG in my ecomodded, dirt cheap, 3-cylinder Mirage.
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
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