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

Reply  Post New Thread
Submit Tools LinkBack Thread Tools
Old 05-26-2009, 08:07 PM   #51 (permalink)
Join Date: Mar 2008
Location: The woods
Posts: 42

Aubergine - '94 Ford Ranger 4x4
90 day: 19.14 mpg (US)
Thanks: 0
Thanked 0 Times in 0 Posts
For lack of a better place to put it

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

Old 12-16-2009, 01:55 AM   #52 (permalink)
Getting BETTER Mileage
Jethro's Avatar
Join Date: Dec 2009
Location: Los Alamos, NM
Posts: 108

Lucky No 19 - '11 Ram 1500 Express ST

Venti - '13 Ram 2500 Tradesman
Thanks: 6
Thanked 18 Times in 8 Posts
^^ I bet that was an expensive "Oh sh*t!"

The belly pans on most higher end sports cars are definitely amazing. I was under my buddies Corvette the other day, I was amazed how much work they did under there. Funny, it still floats around 120ish.
  Reply With Quote
Old 12-30-2009, 07:27 AM   #53 (permalink)
EcoModding Lurker
Join Date: Dec 2009
Location: Kuwait
Posts: 5

Goldie - '90 Chevrolet G20 "Chevy Van" Sport
Thanks: 0
Thanked 1 Time in 1 Post
From I understand, Cd is calculated using the front squared area alone. How does one include things like underbellies, wheel arches etc in the equation? Then, BIG question, what is the correct formula for calculating Cd?

Kuwait, 1990 Chevy Van
  Reply With Quote
Old 12-30-2009, 10:11 AM   #54 (permalink)
Batman Junior
MetroMPG's Avatar
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,125

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

MPGiata - '90 Mazda Miata
90 day: 53.56 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: 64.03 mpg (US)
Thanks: 3,758
Thanked 6,570 Times in 3,406 Posts
Cd is calculated independently of frontal area.

CdA, however, is the product of the two and is the total drag force on the vehicle.

To calculate Cd by itself, you need a wind tunnel, computational fluid dynamics or controlled coast down testing.

... or you could estimate it by fiddling with the other parameters using this tool: http://ecomodder.com/forum/tool-aero...resistance.php
Honda mods: Ecomodding my $800 Honda Fit 5-speed beater
Mitsu mods: Oops, I did it again! Bought another cheap, 3-cylinder Mirage. Mods in progress...
Ecodriving test: Manual vs. automatic transmission MPG showdown

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 12-31-2009, 12:42 AM   #55 (permalink)
EcoModding Lurker
Join Date: Dec 2009
Location: Kuwait
Posts: 5

Goldie - '90 Chevrolet G20 "Chevy Van" Sport
Thanks: 0
Thanked 1 Time in 1 Post
Awesome thanks.
  Reply With Quote
Old 04-09-2010, 01:26 PM   #56 (permalink)
EcoModding Lurker
Join Date: Apr 2010
Location: charleston, sc
Posts: 9

Smurfback - '01 Chevrolet Blazer LS
Thanks: 0
Thanked 1 Time in 1 Post
hi all,

been checking this site for a while now. on a 01 chevy blazer: removed roof rack, folded pass. mirror in, tires at 44 psi and partial grille block = 23.6 mpg (up from ~21 mpg)
lots of good ideas here. thinking of doing some more. this is our only car and my wife's baby so mods need to be more or less invisible.
  Reply With Quote
Old 06-26-2010, 03:14 AM   #57 (permalink)
EcoModding Lurker
Join Date: Sep 2009
Location: Vancouver Washington
Posts: 13
Thanks: 2
Thanked 0 Times in 0 Posts
Originally Posted by Randy_the_Hack View Post

It would be nice to have a sticky out here that broke things out in a quick reference manner:
  • Car mods
    • Prioritized list of aero mods
  • Truck mods
    • Prioritized list of mods

Realizing that various mods deliver different percentages of improvements per vehicle, these might be somewhat general. For example, with a truck, the likely top few mods might be a) lowering the truck, b) less aggressive tire tread and size, c) aero bed cover, etc.

So... unless there is some data out there that indicates smooth wheel covers are a huge saver, I would expect to see these generally at the lower end of the spectrum. I realize that this might be too precise, so grouping in general categories of top mods, middle mods, and everything else, might suffice.

Breaking this out by cars v/s trucks would be quite helpful...

Just my $0.02...
Yes! There are more folks out there whose commuter car is a truck! I am trying to find out what mods are most effective for trucks. I drive a 1999 Dodge Ram 4x4 Quad Cab Cummins turbo diesel with short bed and a canopy. I was thinking of trying those smooth wheel covers, slight mods to wheel wells using spray foam or??? and mudflaps (to be like the SVO mustang ones) ,as well as those NACA duct looking stick-on airfoil thingys. And blocking off grill area, and perhaps belly pans. Suggestions? I'll keep reading more now....
  Reply With Quote
Old 07-06-2010, 06:05 PM   #58 (permalink)
Hypermiling rookie
Laurentiu's Avatar
Join Date: Jan 2010
Location: Limassol , CY
Posts: 288

Opel Corsa B - '96 Opel Corsa 1.2 8V
90 day: 47.27 mpg (US)

VW Bora 1.6 16V - '02 Volkswagen Bora/Jetta
90 day: 35.84 mpg (US)
Thanks: 17
Thanked 36 Times in 21 Posts
what you need the posts for , wanna post a photo ?

"It has been my observation that most people get ahead during the time that others waste" Henry Ford
  Reply With Quote
Old 09-08-2010, 11:00 PM   #59 (permalink)
Master EcoModder
NeilBlanchard's Avatar
Join Date: May 2008
Location: Maynard, MA Eaarth
Posts: 7,882

Mica Blue - '05 Scion xA RS 2.0
Team Toyota
90 day: 42.48 mpg (US)

Forest - '15 Nissan Leaf S
Team Nissan
90 day: 156.46 mpg (US)

Number 7 - '15 VW e-Golf SEL
90 day: 155.81 mpg (US)
Thanks: 3,403
Thanked 2,901 Times in 1,819 Posts
I stumbled across this page today -- is it done by someone who is also here on EM?

Car Aerodynamics 101
Sincerely, Neil

  Reply With Quote
The Following User Says Thank You to NeilBlanchard For This Useful Post:
MrMiata (10-12-2010)
Old 10-10-2010, 05:54 PM   #60 (permalink)
EcoModding Lurker
Join Date: Oct 2010
Location: Lacey, Wa
Posts: 27

Tiny - '90 Honda CRX HF
Last 3: 55.97 mpg (US)
Thanks: 0
Thanked 0 Times in 0 Posts
has anybody considered replacing their hood and fenders with fiberglass? They're a lot lighter to begin with and from what I understand it's easy to sand them and add more fiberglass to create what you want from it so it looks more "whole" and not pieced together. Plus it erases all the little edges that catch the wind when you slap on pvc. Or does it not flow with this site's mantra since you have to put up more money than to just slap on the pvc?

  Reply With Quote
Reply  Post New Thread

Thread Tools

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com