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


Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 11-28-2007, 08:41 AM   #1 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 20,776

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

MPGiata - '90 Mazda Miata
Last 3: 51.27 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 60.34 mpg (US)
Thanks: 2,632
Thanked 5,537 Times in 2,840 Posts
Windows down on VW Golf = 2.5% FE reduction

Originally posted: 08-03-2006, 09:46 PM

---

This could just as easily be a thread about "windows down vs. air conditioning" for best efficiency, but I'm more interested in the aerodynamic implications of the info collected:



Source: Energy Efficient Transportation for Florida

(I don't have a/c, that's why it's not even an issue for me. )

No - the interesting part is seeing the aero impact of windows down quantified for a car with the same basic shape as the Blackflea:

Quote:
Some sources claim that closing windows and using a car's air conditioner will result in higher fuel economy at freeway speeds than leaving the windows open without the air conditioner. FSEC tests showed this in not the case. In repeated evaluation at 65 miles per hour, our test car experienced 11% better fuel efficiency with no A/C and the windows open than using the air conditioner. We also found that closing windows at freeway speeds improved fuel efficiency by 2-3%.

__________________
Latest mods test: 15 mods = 15% MPG improvement: A-B test, 2007 Honda Civic 1.8L, 5-speed
Ecodriving test:
Manual vs. automatic transmission MPG showdown: Nissan Micra 1.6L



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
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 11-28-2007, 08:43 AM   #2 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 20,776

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

MPGiata - '90 Mazda Miata
Last 3: 51.27 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 60.34 mpg (US)
Thanks: 2,632
Thanked 5,537 Times in 2,840 Posts
It doesn't say, but I'd assume windows were all the way down. And it's a North American GTI, so it only has front-opening windows.

It's about the FE penalty I would have expected to see for windows all the way open.
__________________
Latest mods test: 15 mods = 15% MPG improvement: A-B test, 2007 Honda Civic 1.8L, 5-speed
Ecodriving test:
Manual vs. automatic transmission MPG showdown: Nissan Micra 1.6L



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 11-28-2007, 08:43 AM   #3 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 20,776

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

MPGiata - '90 Mazda Miata
Last 3: 51.27 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 60.34 mpg (US)
Thanks: 2,632
Thanked 5,537 Times in 2,840 Posts
I thought 2.5% was realistic based the size of an open front window compared to the size of an open wheel well. Covering my rear wheel wells improved my FE about 2.8%. "Uncovering" the GTI windows reduced its efficiency by 2.5%.

I realize they're not the same things (one doesn't have a spinning wheel inside it, further stirring up the air). But it's in the ballpark.

__________________
Latest mods test: 15 mods = 15% MPG improvement: A-B test, 2007 Honda Civic 1.8L, 5-speed
Ecodriving test:
Manual vs. automatic transmission MPG showdown: Nissan Micra 1.6L



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
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com