Go Back   EcoModder Forum > EcoModding > Aerodynamics
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 08-31-2009, 06:19 AM   #1 (permalink)
Master EcoModder
 
Join Date: Feb 2008
Location: belgium
Posts: 663

vectra a - '95 Opel Vectra GLS
90 day: 37.51 mpg (US)
Thanks: 14
Thanked 61 Times in 44 Posts
BMW Vision EfficientDynamics Concept 0.22Cd

Cd is the new HP again... well maybe not, but a while ago noone cared even what a car's Cd was, now the numbers are bragged about again.

BMW Vision EfficientDynamics Concept



what's mainly interesting in this car for me is that it's roughly a 4 door sedan shape, and that it's got good aero, no mather what will power the car of the future, good aero will always improve FE.

although the back looks as impractical as it is beautifull in a sculpture sort of way, the rest of the flowing lines, and the shape between the wheels could easily be adopted by the next generation of BMW sedans.

anyway, it's good to see some carmakers are actively looking for ways to improve a cars Cd ... the 0.3 barier has been beaten a long time ago, so not the race for a sub 0.2Cd can begin!


Last edited by lunarhighway; 08-31-2009 at 01:02 PM..
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 08-31-2009, 08:24 AM   #2 (permalink)
EcoModding Apprentice
 
Join Date: Jun 2009
Location: Pittsburgh, Pennsylvania
Posts: 201
Thanks: 54
Thanked 30 Times in 18 Posts
This is a great vehicle. Definitely interested to see what bits of this car filter down to the more plebian vehicles. (And it would be very cool if they decided to produce this one, too!)
  Reply With Quote
Old 08-31-2009, 09:19 AM   #3 (permalink)
Master EcoModder
 
Join Date: Feb 2008
Location: belgium
Posts: 663

vectra a - '95 Opel Vectra GLS
90 day: 37.51 mpg (US)
Thanks: 14
Thanked 61 Times in 44 Posts
yea at first it screams "concept car", but than when you imagine it in black...it wouldn't look that much out of place next to curent bmw's

things like the A pillars and the shape of the bonnet.

one thing that got me thinking however is that like some curent bmw's this car has an active grillblock.
What this basically means is that this car is going to have a variable Cd! it will have more air resistance with the grill open than closed and the difference could be rather big... so than how do you come up with a single Cd figure for the car?
do you take the lowest (tempting ) a 50% average or something calculated from the ammount a grill is open during a cerain test cycle?
  Reply With Quote
Old 08-31-2009, 11:51 AM   #4 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,513

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

MPGiata - '90 Mazda Miata
90 day: 52.71 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 70.75 mpg (US)

Appliance car - '14 Mitsubishi Mirage ES (base)
90 day: 60.16 mpg (US)
Thanks: 4,058
Thanked 6,957 Times in 3,602 Posts
Quote:
Originally Posted by lunarhighway View Post
Cd is the now HP again... well maybe not, but a while ago noone cared even what a car's Cd was, now the numbers are bragged about again.
I suspect (hope) BMW is reacting to Mercedes' claims that it will dominate production cars' Cd figures in five years:

http://ecomodder.com/forum/showthrea...ears-8284.html
__________________
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
www.ForkenSwift.com - electric car conversion on a beer budget
  Reply With Quote
Old 08-31-2009, 06:50 PM   #5 (permalink)
EcoModding Lurker
 
Join Date: Feb 2009
Location: ohio
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
I don't believe it. The sunken headlights and grill, the sculpting on the sides, the wheel flares, the taillight tunnels, all that stuff is messing with the airflow. no way is that .20. Real cool looking, tho, especially the interior, in a '50's car-of-the-future way.
  Reply With Quote
Old 08-31-2009, 07:14 PM   #6 (permalink)
Left Lane Ecodriver
 
RobertSmalls's Avatar
 
Join Date: Aug 2008
Location: Buffalo, NY, USA
Posts: 2,257

Prius C - '12 Toyota Prius C
Thanks: 79
Thanked 286 Times in 199 Posts
Yeah, concept car. But there's a few things to like about it: lower grille block, tiny gap between fender and tire, pretty smooth wheel covers, tiny mirrors, and a body that tapers in from above, below, left, and right. Only half of those features will survive the translation from concept car, so I wouldn't expect a Cd < 0.25, which still leaves room for this car to compete with the Prius.

The powertrain is probably more impressive. When I started reading about the 1.5L, 3-cyl diesel, I rolled my eyes and said "This is not a BMW." Then I got to the part about it producing 163HP, and having 356HP and 590 ft-lbs of torque when you add in the two electric motors. Wow.

Cut all those numbers to a third, and you'd have a very reasonable Prius-fighter. Of course, it wouldn't be a BMW.
  Reply With Quote
Old 08-31-2009, 10:29 PM   #7 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 15,861
Thanks: 23,922
Thanked 7,207 Times in 4,640 Posts
vision

when BMW speaks many listen,and remains a significant influence on the entire industry.The very act of including Cd in official public communications lends "significance" to aerodynamics.I'll take that as a positive.
  Reply With Quote
Old 09-01-2009, 12:37 AM   #8 (permalink)
Master EcoModder
 
Join Date: Jan 2009
Location: Maui, Hawaii
Posts: 813
Thanks: 5
Thanked 34 Times in 26 Posts
Quote:
Originally Posted by RobertSmalls View Post
Yeah, concept car. But there's a few things to like about it: lower grille block, tiny gap between fender and tire, pretty smooth wheel covers, tiny mirrors, and a body that tapers in from above, below, left, and right. Only half of those features will survive the translation from concept car, so I wouldn't expect a Cd < 0.25, which still leaves room for this car to compete with the Prius.

The powertrain is probably more impressive. When I started reading about the 1.5L, 3-cyl diesel, I rolled my eyes and said "This is not a BMW." Then I got to the part about it producing 163HP, and having 356HP and 590 ft-lbs of torque when you add in the two electric motors. Wow.

Cut all those numbers to a third, and you'd have a very reasonable Prius-fighter. Of course, it wouldn't be a BMW.
Why cut those numbers to 1/3? What would be gained by having weaker electric motors and diesel?
  Reply With Quote
Old 09-01-2009, 12:41 AM   #9 (permalink)
Master EcoModder
 
Join Date: Jan 2009
Location: Maui, Hawaii
Posts: 813
Thanks: 5
Thanked 34 Times in 26 Posts
Quote:
Originally Posted by wibiwo View Post
I don't believe it. The sunken headlights and grill, the sculpting on the sides, the wheel flares, the taillight tunnels, all that stuff is messing with the airflow. no way is that .20. Real cool looking, tho, especially the interior, in a '50's car-of-the-future way.
All that is supposed to control airflow in a way that apparently reduces drag

Quote:
Slender openings around the front air dam guide the air flowing specifically into two closed ducts leading inside the front air dam to the wheel arches where the air comes out again through a very slim aperture at high speed, flowing just next to the outer wheel flanks.

This air jet rests on the front wheels like a curtain and is therefore referred to most appropriately as the “air curtain.” It provides a highly stabilizing effect.
  Reply With Quote
Old 09-01-2009, 02:27 AM   #10 (permalink)
Master EcoModder
 
Join Date: Feb 2008
Location: belgium
Posts: 663

vectra a - '95 Opel Vectra GLS
90 day: 37.51 mpg (US)
Thanks: 14
Thanked 61 Times in 44 Posts
it actually also reminded me of another car wich i couldn't put my finger on

the mazda taiki

perhaps not a direct visual link but there some of the same stuff going on at the back.
we all know a teardrop is a very eddicient shape, but somehow cars like the aptera do not convey a muscle car feel or sence of great "power"
also broad track 4 weeled vehicles are difficult to match with a teardorp shape
gm wen wrong there with the brutal volt concept and than had to back it of a bit.

i think the trick is to make a car wich looks powerfull and wide at the back to the eye but not to the air...

personally i think little by little the wheels are sepparating themselves from the body work... wich is ironic as it took them so long to finally become part of it


Last edited by lunarhighway; 09-01-2009 at 04:37 AM..
  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Honda Insight Concept to Debut at Paris Int. Auto Show SVOboy EcoModder Blog Discussion 32 04-17-2009 10:45 AM
A first? BMW concept vehicle preheats transmission fluid to improve efficiency MetroMPG EcoModding Central 3 11-07-2008 05:52 AM
BMW Concept iSetta Arminius The Lounge 4 04-04-2008 09:44 PM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com