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

View Poll Results: Do you think a 928 is more aero going forward or backward? Episode airs Nov 17th!
Forward 18 43.90%
Backward 23 56.10%
Voters: 41. You may not vote on this poll

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 11-05-2010, 07:40 PM   #21 (permalink)
The PRC.
 
Join Date: Oct 2009
Location: Elsewhere.
Posts: 5,304
Thanks: 285
Thanked 536 Times in 384 Posts
Will they do the only car with a sqaure steering wheel, the Allegro next ?



Leg-end has it that it has better aero in reverse...

__________________
[I]So long and thanks for all the fish.[/I]
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 11-05-2010, 08:20 PM   #22 (permalink)
PSmodder lurker
 
Join Date: Jan 2009
Location: Chino
Posts: 1,605
Thanks: 26
Thanked 908 Times in 522 Posts
Remember reading about that famous project by Gunter Artz, deutsch hot rodder. Great mechanicals on a much smaller & lighter platform. Even though it was widened, it was front heavy & kept the short wheelbase. Dynamically it was respectable for straight line but handled erratically because of unbalanced weight distribution and high polar moment of inertia.
  Reply With Quote
The Following User Says Thank You to botsapper For This Useful Post:
MetroMPG (11-05-2010)
Old 11-05-2010, 09:21 PM   #23 (permalink)
Cd
Ultimate Fail
 
Cd's Avatar
 
Join Date: Feb 2008
Location: Austin,Texas
Posts: 3,585
Thanks: 2,872
Thanked 1,121 Times in 679 Posts
I'm guessing that those rear view mirrors are going to create some mean vortices in an already low pressure area.
The 'windshield' needs more slope.

We had a thread on this car several months ago talking of this very thing. I even did a Photoshop quickie of the car backwards with the window popped out at the 'correct' angle.
I also did a test in the Flow Simulator. I'll try to find it.
  Reply With Quote
Old 11-06-2010, 03:00 PM   #24 (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
backwards

Just for giggles I'm going with 'backwards.'
The Porsche, loosely designed around Ludwig Prandtl's 'Lange Car',an out-growth of Jaray's combination-form design,while not great,aerodynamically,can serve a family of four in reasonable comfort.
The 928s aft-body will make a fine fore-body. And yes,there should be separation at the windshield header and the flow might not ever re-attach,but with the nose stuffing the wake,and forcing the area the turbulence can occupy,it might be reasonable to expect an overall drag reduction.
I hope the folks at Chrysler are watching,they actually did this with the 1933 DeSoto sedan for a significant top speed and mpg increase while driving coast-to-coast across the U.S.,'backwards!
  Reply With Quote
The Following User Says Thank You to aerohead For This Useful Post:
NeilBlanchard (11-07-2010)
Old 11-06-2010, 06:34 PM   #25 (permalink)
EcoModding Lurker
 
Join Date: Oct 2010
Location: Wells, Maine
Posts: 50
Thanks: 1
Thanked 9 Times in 8 Posts
Quote:
Originally Posted by Arragonis View Post
Will they do the only car with a sqaure steering wheel, the Allegro next ?



Leg-end has it that it has better aero in reverse...
Or the aerodynamics of the model on the hood
  Reply With Quote
Old 11-17-2010, 07:51 PM   #26 (permalink)
EcoModding Apprentice
 
QuickLTD's Avatar
 
Join Date: Apr 2009
Location: Tampa, Florida
Posts: 188

Flying Brick - '96 Pontiac Bonneville SE
90 day: 23.57 mpg (US)
Thanks: 1
Thanked 15 Times in 8 Posts
Send a message via AIM to QuickLTD Send a message via Yahoo to QuickLTD
Okay, tonight is the night. Lets see how this one turns out.
__________________
1996 Pontiac Bonneville SE 3.8L V6
  Reply With Quote
The Following User Says Thank You to QuickLTD For This Useful Post:
NeilBlanchard (11-18-2010)
Old 11-18-2010, 12:41 PM   #27 (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
So, how'd it turn out?

I don't think we get the episode here in Canada as quickly as you guys do in the US.
__________________
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 11-18-2010, 03:32 PM   #28 (permalink)
EcoModding Lurker
 
Join Date: May 2009
Location: Poland
Posts: 21

Sharon - '00 Fiat Punto ELX JTD
90 day: 42.76 mpg (US)
Thanks: 0
Thanked 3 Times in 1 Post
They managed to bust the myth.
I'm not really impressed by their effort.
Testing in 1:24 shown ~9% increase in drag (if I remember correctly) - that's cool with me.
For full scale they used:
-3x 0-60mph timed runs
-3x 1/4 mile timed runs
-3x 1 mile fuel economy runs (way too short in my opinion)

Regular version of the car was unchanged.
Rotated version of the car was butchered and you could clearly see the road through wheel wells on inside shots => that could cause some extra drag O_o
I believe that they didn't pay that much attention to weight distribution when they installed weight replacements for removed parts so 0-60 runs didn't seem fair to me.

The last test when they used second 928 to compare aero by coasting looked quite decent but saying that there are no variables other than aerodynamics with these two different cars is a bit inaccurate - I was watching it in low-quality but I don't think the silver 928 has 'phonedials', same model of tires, pressures etc

Enjoyable watch, but disappointing in depth.
  Reply With Quote
The Following 3 Users Say Thank You to jabb For This Useful Post:
aerohead (11-20-2010), MetroMPG (11-18-2010), Piwoslaw (11-19-2010)
Old 11-18-2010, 03:49 PM   #29 (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
Thanks for the summary.

Quote:
Enjoyable watch, but disappointing in depth.
That's how I'd describe the show most of the time!

In a commercial I saw yesterday, they say they test myths "in the name of science." Not quite! "In the name of entertainment" first, "science" is definitely second.
__________________
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 11-18-2010, 05:19 PM   #30 (permalink)
...beats walking...
 
Join Date: Jul 2009
Location: .
Posts: 6,190
Thanks: 179
Thanked 1,525 Times in 1,126 Posts
Quote:
Originally Posted by MetroMPG View Post
Not quite! "In the name of entertainment" first, "science" is definitely second.
....yes, and, too often, it's a distant second.

  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Replacing metal body panels with plastic silverhawk_184 EcoModding Central 8 12-07-2010 07:18 PM
Drag Racing Aero Help Bennett_Racing Aerodynamics 33 06-28-2010 06:02 AM



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