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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 12-06-2009, 11:14 PM   #261 (permalink)
Moderate your Moderation.
 
Join Date: Nov 2008
Location: Troy, Pa.
Posts: 8,919

Pasta - '96 Volkswagen Passat TDi
90 day: 45.22 mpg (US)
Thanks: 1,369
Thanked 430 Times in 353 Posts
Quote:
Originally Posted by brucey View Post
I really want to re do my tail now after seeing a 15% increase in yours. Damn!

Mine showed up absolutely nothing. But it also was a lot steeper. I fail.
You don't fail until you give up. You learn, and move on.

__________________
"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"

  Reply With Quote
The Following 3 Users Say Thank You to Christ For This Useful Post:
Cd (12-07-2009), Piwoslaw (12-07-2009), some_other_dave (12-08-2009)
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 12-06-2009, 11:29 PM   #262 (permalink)
Master EcoModder
 
Join Date: Nov 2009
Location: Leadville, CO
Posts: 509

Maroon Ballon - '98 Chrysler Town & Country LXI
90 day: 26.42 mpg (US)

MaEsTRO - '95 Geo Metro 5spd hatch, 3 cyl
Thanks: 47
Thanked 54 Times in 38 Posts
Quote:
Originally Posted by MetroMPG View Post
All the other aero stuff I've done upstream affects the performance of the tail - meaning it wouldn't work as well without these:
  • partial grille block,
  • headlight gaps sealed
  • hood/bumper gap closed
  • pass mirror delete,
  • partial cowl block,
  • wipers were off
  • smooth wheel covers
  • rear fender skirts
  • and the big one: full smooth undertray
  • EDIT: forgot radio antenna delete
Obviously, your recent test results reflect the sum of all your modifications. But (please correct me if I'm wrong), if there is one area that made more of a difference, it seems like work on the aft portion of the car netted bigger results than work on the other areas.

This does seem to be the case with recumbent bicycles. On a recumbent, you present a significantly smaller frontal area, and having done that, even though the air is very dirty forward of the CG, with legs, feet, crank, front wheel, etc., churning the air, once the airflow is past that point, if you can smooth it out and get it to reattach with a rear fairing, you get more speed results than with a front fairing.



A front fairing will give you more comfort than a rear fairing, but there are issues of visibility and the mechanics of steering at the front of the vehicle that make it more complicated. A completely enclosed bike is optimal for efficiency, but crosswind stability and just being able to put your feet on the ground are issues. But if you're going to try to get the most out of one single area, bringing the air back together at the stern seems to work better than cutting through it at the bow.

It looks like your test results corroborate this theory.
  Reply With Quote
The Following 2 Users Say Thank You to thatguitarguy For This Useful Post:
aerohead (12-09-2009), Frank Lee (12-07-2009)
Old 12-06-2009, 11:57 PM   #263 (permalink)
Master EcoModder
 
orange4boy's Avatar
 
Join Date: Aug 2008
Location: The Wet Coast, Kanuckistan.
Posts: 1,275

The Golden Egg - '93 Toyota Previa DX
90 day: 31.91 mpg (US)

Chewie - '03 Toyota Prius
90 day: 57 mpg (US)

The Spaceship - '00 Honda Insight
Thanks: 100
Thanked 306 Times in 178 Posts
Fan-moddin-tastic. Absolutely mod-a-licious. 15% is meaty. I bet you would get another 4% from the wheel-tails.

I'm continually amazed by the potential of good aero and the ability of us (mostly) laypersons to beat the OEMs silly with mods that look good. I suppose Aero-beauty is in the eye of the Ecomodder, though.

Congrats!
__________________
Vortex generators are old tech. My new and improved vortex alternators are unstoppable.

"It’s easy to explain how rockets work but explaining the aerodynamics of a wing takes a rocket scientist.


  Reply With Quote
Old 12-07-2009, 12:02 AM   #264 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,530

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

MPGiata - '90 Mazda Miata
90 day: 54.46 mpg (US)

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

Appliance car Mirage - '14 Mitsubishi Mirage ES (base)
90 day: 62.14 mpg (US)
Thanks: 4,078
Thanked 6,978 Times in 3,613 Posts
Quote:
Originally Posted by brucey View Post
I really want to re do my tail now after seeing a 15% increase in yours. Damn!

Mine showed up absolutely nothing. But it also was a lot steeper. I fail.
5 words: "tuft testing is your friend."

But you reminded me I also had some questions about your test - posted in your boat tail thread.
__________________
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 12-07-2009, 12:12 AM   #265 (permalink)
(:
 
Frank Lee's Avatar
 
Join Date: Jan 2008
Location: up north
Posts: 12,762

Blue - '93 Ford Tempo
Last 3: 27.29 mpg (US)

F150 - '94 Ford F150 XLT 4x4
90 day: 18.5 mpg (US)

Sport Coupe - '92 Ford Tempo GL
Last 3: 69.62 mpg (US)

ShWing! - '82 honda gold wing Interstate
90 day: 33.65 mpg (US)

Moon Unit - '98 Mercury Sable LX Wagon
90 day: 21.24 mpg (US)
Thanks: 1,585
Thanked 3,555 Times in 2,218 Posts


You know what this means... I have to get out more plywood... or something.

Great job Metro!
__________________


  Reply With Quote
Old 12-07-2009, 12:32 AM   #266 (permalink)
Master EcoModder
 
Join Date: Nov 2009
Location: Leadville, CO
Posts: 509

Maroon Ballon - '98 Chrysler Town & Country LXI
90 day: 26.42 mpg (US)

MaEsTRO - '95 Geo Metro 5spd hatch, 3 cyl
Thanks: 47
Thanked 54 Times in 38 Posts
Just get some Coroplast, Frank.





DIY MOAT - Mother Of All Tailboxes
  Reply With Quote
The Following 4 Users Say Thank You to thatguitarguy For This Useful Post:
aerohead (12-09-2009), Arctic Fox (01-20-2012), Christ (12-07-2009), silverinsight2 (12-08-2009)
Old 12-07-2009, 01:37 AM   #267 (permalink)
Moderate your Moderation.
 
Join Date: Nov 2008
Location: Troy, Pa.
Posts: 8,919

Pasta - '96 Volkswagen Passat TDi
90 day: 45.22 mpg (US)
Thanks: 1,369
Thanked 430 Times in 353 Posts
Quote:
Originally Posted by orange4boy View Post
Fan-moddin-tastic. Absolutely mod-a-licious. 15% is meaty. I bet you would get another 4% from the wheel-tails.

I'm continually amazed by the potential of good aero and the ability of us (mostly) laypersons to beat the OEMs silly with mods that look good. I suppose Aero-beauty is in the eye of the Ecomodder, though.

Congrats!
I'm Christ, and I stand behind this statement 100%.





This post paid for by the Committee to Agree Needlessly with Obviously Correct Statements. CANOCS is a non-profit organization.
__________________
"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"

  Reply With Quote
Old 12-07-2009, 01:40 AM   #268 (permalink)
Moderate your Moderation.
 
Join Date: Nov 2008
Location: Troy, Pa.
Posts: 8,919

Pasta - '96 Volkswagen Passat TDi
90 day: 45.22 mpg (US)
Thanks: 1,369
Thanked 430 Times in 353 Posts
Quote:
Originally Posted by thatguitarguy View Post
Just get some Coroplast, Frank.





DIY MOAT - Mother Of All Tailboxes
Jpeg saved. Hellz yeah.
__________________
"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"

  Reply With Quote
Old 12-07-2009, 02:03 AM   #269 (permalink)
aero guerrilla
 
Piwoslaw's Avatar
 
Join Date: Oct 2008
Location: Warsaw, Poland
Posts: 3,747

Svietlana II - '13 Peugeot 308SW e-HDI 6sp
90 day: 58.1 mpg (US)
Thanks: 1,328
Thanked 749 Times in 476 Posts
Quote:
Originally Posted by thatguitarguy View Post
Just get some Coroplast, Frank.

DIY MOAT - Mother Of All Tailboxes
This, and a few others, should go in their own thread to make them easier to come across.
__________________
e·co·mod·ding: the art of turning vehicles into what they should be

What matters is where you're going, not how fast.

"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell


[Old] Piwoslaw's Peugeot 307sw modding thread
  Reply With Quote
The Following User Says Thank You to Piwoslaw For This Useful Post:
Christ (12-07-2009)
Old 12-07-2009, 02:54 AM   #270 (permalink)
Moderate your Moderation.
 
Join Date: Nov 2008
Location: Troy, Pa.
Posts: 8,919

Pasta - '96 Volkswagen Passat TDi
90 day: 45.22 mpg (US)
Thanks: 1,369
Thanked 430 Times in 353 Posts
Something like a thread for the various templates we use?

__________________
"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"

  Reply With Quote
The Following User Says Thank You to Christ For This Useful Post:
Piwoslaw (12-07-2009)
Reply  Post New Thread


Tags
boat tail, testing



Similar Threads
Thread Thread Starter Forum Replies Last Post
Project: Rebuilding an '01 Honda Insight as a nonhybrid Fabio Hybrids 158 01-12-2013 12:59 PM
How to get instant fuel consumption from Megasquirt TELVM Instrumentation 11 08-29-2011 03:47 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