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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 03-05-2009, 11:52 PM   This thread is in the EcoModder Project Library | #1 (permalink)
Master EcoModder
 
Join Date: Oct 2008
Location: Mid-Atlantic
Posts: 491

OurInsight - '06 Honda Insight
Thanks: 170
Thanked 68 Times in 43 Posts
Aerodynamic Belly Pan on Toyota Echo

I have spent a fair amount of time lying on my track mat underneath my Echo trying to figure where the most productive underbelly additions could be made. The areas in front of the rear axel are pretty clean, particularly in the mid-car area. In addition, Toyota added a small flow smoother behind the front bumper. The area behind the rear axel is a real disaster. It has lots of rough protrusions and lots of “vertical” wall sections in front of rear bumper - pretty typical on many cars. (See the first three pictures which reflect these problems.)

Spending still more time on my back, I quickly concluded that though a rear belly pan would be helpful, there was no way to attach one. So I set about designing and constructing a light framework using small aluminum channel and angle, purchased at Lowes. I also had to add some attachment points for the framework. (The fourth picture shows this framework.) The lower bumper cover was planned as the rear attachment point for belly pan .

With the framework in place, it only remained to cut the coroplast in two pieces, one large, one smaller, and to attach the coroplast to the framework with self tapping screws. Note the section of aluminum flashing which was used in the area of the exhaust pipe. Also note that the muffler is left uncovered to maintain cooling.

I plan to do some ScanGauge testing when I can return to my baseline test track in a couple of months. Obviously, I won’t be able to do the more desirable A-B-A type test, but my previous baseline should support some rough conclusions

Attached Thumbnails
Click image for larger version

Name:	DSC_2295_edited-1.jpg
Views:	862
Size:	90.3 KB
ID:	2861   Click image for larger version

Name:	DSC_2298_edited-1.jpg
Views:	711
Size:	82.8 KB
ID:	2862   Click image for larger version

Name:	DSC_2297_edited-1.jpg
Views:	680
Size:	76.7 KB
ID:	2863   Click image for larger version

Name:	DSC_2304_edited-1.jpg
Views:	869
Size:	85.4 KB
ID:	2864   Click image for larger version

Name:	DSC_2310_edited-1.jpg
Views:	1034
Size:	107.8 KB
ID:	2865  

  Reply With Quote
The Following User Says Thank You to jime57 For This Useful Post:
EchoBallin (12-20-2013)
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 03-06-2009, 12:49 AM   #2 (permalink)
Young'n
 
Join Date: Jan 2009
Location: Missouri
Posts: 50

Red Dread - '03 Ford Ranger FX4 Level II
90 day: 19.81 mpg (US)

Bessie - '08 Honda Civic Hybrid
Thanks: 1
Thanked 0 Times in 0 Posts
Awesome work Jimepting! Although I'm curious as to why you didn't start from the front and work your way back? Regardless...this should help with some of the flow under the car .
__________________


  Reply With Quote
Old 03-06-2009, 03:54 AM   #3 (permalink)
Master EcoModder
 
Join Date: Jan 2009
Location: Maui, Hawaii
Posts: 813
Thanks: 5
Thanked 33 Times in 26 Posts
Looks nice, good job avoiding the muffler.

Ferr3t, I think he did the back first because the parachute rear bumper was the most offensive
  Reply With Quote
Old 03-06-2009, 04:26 AM   #4 (permalink)
Pokémoderator
 
cfg83's Avatar
 
Join Date: Dec 2007
Location: Southern California
Posts: 5,864

1999 Saturn SW2 - '99 Saturn SW2 Wagon
Team Saturn
90 day: 40.49 mpg (US)
Thanks: 439
Thanked 527 Times in 354 Posts
jimepting -

Wow, that was worth the wait! Very clean execution.

CarloSW2
__________________

What's your EPA MPG? Go Here and find out!
American Solar Energy Society
  Reply With Quote
Old 03-06-2009, 06:28 AM   #5 (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 60 Times in 43 Posts
nice job indeed, i've been thinking about something similar, so it's nice to see how you made the braces.

the only thing that has been keeping me back, and i don't mean to discourage you, is the report that rear undertrays are far less effective when the underside ahead of them is't smooth... of course any improvement no matter how small is worth it. and i hope you see a nice improvement.
  Reply With Quote
Old 03-06-2009, 06:33 AM   #6 (permalink)
Master EcoModder
 
Join Date: Oct 2008
Location: Mid-Atlantic
Posts: 491

OurInsight - '06 Honda Insight
Thanks: 170
Thanked 68 Times in 43 Posts
Quote:
Originally Posted by Ferr3t View Post
Awesome work Jimepting! Although I'm curious as to why you didn't start from the front and work your way back? Regardless...this should help with some of the flow under the car .
Toyota did some under belly work at the front, immediately behind the front bumper. Though there are a couple of areas which can still be enclosed, the front didn't look nearly as rewarding as the back. I will probably do some additional front work when I get the chance.

The front, around the engine, would seem to have some additional constraints. It would seem that the exhaust system would need to be left open, and some airflow out of the radiator area must be maintained.

Sorry, I don't have pictures of front area. We are traveling in the southwest and my ramps (concrete blocks and boards) are stashed in a weed patch in TN - no not that kind of weed
  Reply With Quote
Old 03-06-2009, 09:01 AM   #7 (permalink)
Master EcoModder
 
NeilBlanchard's Avatar
 
Join Date: May 2008
Location: Maynard, MA Eaarth
Posts: 7,725

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
TEAM VW AUDI Group
90 day: 155.81 mpg (US)
Thanks: 3,182
Thanked 2,755 Times in 1,720 Posts
Hi,

I can tell that the Echo and the xA are very similar:



I had to take it off for the winter -- too much stuff would have gotten stuck up on top. Do you have pictures of the front grill area? I have found that sealing up and smoothing the nose of the car is at least 2X more effective than mods on any of the other areas of the aerodynamics.

http://ecomodder.com/forum/showthrea...mods-2969.html

I tried covering the holes in the radiator cowling, between the bumper and the radiator, and I found that it added drag -- though I think if you close down the front grills enough, you can see some big improvements. (See the latest grill block at the end of the thread.)

I think the Echo has one big advantage over the xA: the wheel openings are much tighter to the tires, I think.
__________________
Sincerely, Neil

http://neilblanchard.blogspot.com/

Last edited by NeilBlanchard; 03-06-2009 at 09:08 AM..
  Reply With Quote
Old 03-06-2009, 11:46 AM   #8 (permalink)
Master EcoModder
 
Join Date: Oct 2008
Location: Mid-Atlantic
Posts: 491

OurInsight - '06 Honda Insight
Thanks: 170
Thanked 68 Times in 43 Posts
Very interesting Neil. I do plan to do some work up front. Looking at your photos, I am wondering if you attached the belly pan directly to the axel. I was tempted to do that, but of course the axel moves with suspension travel, so I thought it risky.

I have a very smooth grill block for the upper radiator grill. I find that the Echo gets plenty of air just through the bottom grill. I also block half the bottom grill in the winter. I have yet to test any of these mods, since it is winter and I'm away from my "test track."

I tested my fender skirts and found them worth .7-.8 MPG, near as I could tell. Small improvements add up, but they are tough to measure individually.
  Reply With Quote
Old 03-06-2009, 12:01 PM   #9 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 21,250

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

MPGiata - '90 Mazda Miata
90 day: 52.8 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 73.57 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 55.99 mpg (US)
Thanks: 3,004
Thanked 5,885 Times in 3,051 Posts
Rear pan looks good! Thanks for posting the pics.

Quote:
Originally Posted by jimepting View Post
I plan to do some ScanGauge testing when I can return to my baseline test track in a couple of months. Obviously, I won’t be able to do the more desirable A-B-A type test, but my previous baseline should support some rough conclusions
Keep in mind that all else being equal, even an ambient temperature difference can have a measurable impact on fuel consumption. Something to keep in mind when drawing conclusions about something like a partial undertray that will likely have a small (but still worthwhile!) effect on drag,
__________________
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 03-06-2009, 12:13 PM   #10 (permalink)
Dartmouth 2010
 
SVOboy's Avatar
 
Join Date: Nov 2007
Location: Hanover, NH
Posts: 6,427

Vegan Powa! - '91 Honda CRX DX
Team Honda
90 day: 66.52 mpg (US)
Thanks: 92
Thanked 114 Times in 82 Posts
Send a message via AIM to SVOboy Send a message via MSN to SVOboy Send a message via Yahoo to SVOboy
Looks good indeed,

  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Honda Fit Belly Pan Project Fit Aerodynamics 17 08-10-2015 09:29 AM
Permanent Aluminum Grill Block and Belly Pan Markmysite EcoModding Central 41 02-27-2014 10:22 PM
belly pan thrash 2008 lovemysan Aerodynamics 12 09-23-2009 08:51 PM
Started on a belly pan brucey Aerodynamics 3 02-03-2009 09:14 AM
Belly Pan on the Saturn Raysp30 Aerodynamics 8 07-14-2008 02:46 PM



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