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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 02-28-2009, 03:47 PM   #221 (permalink)
Cd
Ultimate Fail
 
Cd's Avatar
 
Join Date: Feb 2008
Location: Austin,Texas
Posts: 3,330
Thanks: 2,674
Thanked 932 Times in 554 Posts
So, basjoos, does this new low Cd figure improve the .17 figure that you arrived at ?

I never saw any of your coast down testing that you did to arrive at that figure. Did you create a seperate thread, or did I just miss it ?

Also, what is the cars Cd ( yes I know ...point 17, but I mean like .171 or .179 )

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 02-28-2009, 05:48 PM   #222 (permalink)
Master EcoModder
 
basjoos's Avatar
 
Join Date: Dec 2007
Location: Upstate SC
Posts: 1,073

Aerocivic - '92 Honda Civic CX
Last 3: 70.54 mpg (US)

AerocivicLB - '92 Honda Civic CX
Team Honda
90 day: 55.14 mpg (US)

Camryglide - '20 Toyota Camry hybrid LE
90 day: 63.11 mpg (US)
Thanks: 11
Thanked 642 Times in 289 Posts
The changed OEM Cd figure has no effect on the 0.17 figure since that was determined by coastdown testing done using that spreadsheet from Instructables. Actually my Cd might even be a bit lower than that now as I have installed a number of minor aero mods since doing that coastdown testing. The problem is finding a long enough, flat, and lightly trafficked stretch of road to do the testing on. Its all rolling terrain here, so I have to make a trip down to the coastal plains of SC to do it.

I'd have to pull my original data points out and plug them back into that spreadsheet to get the 0.00 CD figure, but that might be false accuracy since my original data was to the nearest second, not the nearest 0.1 sec.
__________________
aerocivic.com
  Reply With Quote
Old 02-28-2009, 09:11 PM   #223 (permalink)
Master EcoModder
 
NeilBlanchard's Avatar
 
Join Date: May 2008
Location: Maynard, MA Eaarth
Posts: 7,884

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: 3,404
Thanked 2,904 Times in 1,821 Posts
Thanks for clarifying how you got the Cd figure. BTW, does the AeroCivic have a full belly pan as well?
__________________
Sincerely, Neil

http://neilblanchard.blogspot.com/
  Reply With Quote
Old 02-28-2009, 11:50 PM   #224 (permalink)
Grasshopper
 
alohaspirit's Avatar
 
Join Date: Feb 2009
Location: Hawaii
Posts: 964

Makai - '01 Toyota Echo 4D Auto
90 day: 34.45 mpg (US)

New Galaxy - '07 Toyota Prius
90 day: 42.15 mpg (US)
Thanks: 25
Thanked 30 Times in 25 Posts
Everytime I see the Aerocivic I think how cool it would be to see it fully glassed and molded

(maybe even in carbon fibre)

Get rid of all those seams and you could probably knock off .01 or .02
__________________
Past Present Future?
  Reply With Quote
Old 03-01-2009, 07:30 AM   #225 (permalink)
Master EcoModder
 
basjoos's Avatar
 
Join Date: Dec 2007
Location: Upstate SC
Posts: 1,073

Aerocivic - '92 Honda Civic CX
Last 3: 70.54 mpg (US)

AerocivicLB - '92 Honda Civic CX
Team Honda
90 day: 55.14 mpg (US)

Camryglide - '20 Toyota Camry hybrid LE
90 day: 63.11 mpg (US)
Thanks: 11
Thanked 642 Times in 289 Posts
Quote:
Originally Posted by NeilBlanchard View Post
Thanks for clarifying how you got the Cd figure. BTW, does the AeroCivic have a full belly pan as well?
It has a full belly pan. The only parts of the underside that are still exposed to the airflow are the interior side of the wheels. I am still working out a mechanism that would shield the inside edge of the wheels from the wind while not interfering with suspension travel or front wheel turning.

It would be nice is my car's exterior were done in glass, but I don't have any experience working with it and don't have the climate controlled garage it would take to cure epoxy in my humid climate.
__________________
aerocivic.com
  Reply With Quote
Old 03-01-2009, 08:36 AM   #226 (permalink)
Master EcoModder
 
NeilBlanchard's Avatar
 
Join Date: May 2008
Location: Maynard, MA Eaarth
Posts: 7,884

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: 3,404
Thanked 2,904 Times in 1,821 Posts
Hi,

I'd assumed it probably did, because any vehicle with a Cd below 0.2 has to, I think.

Can you link to an explanation of the coast-down procedure to measure Cd, please?
__________________
Sincerely, Neil

http://neilblanchard.blogspot.com/
  Reply With Quote
Old 03-01-2009, 10:48 AM   #227 (permalink)
Master EcoModder
 
basjoos's Avatar
 
Join Date: Dec 2007
Location: Upstate SC
Posts: 1,073

Aerocivic - '92 Honda Civic CX
Last 3: 70.54 mpg (US)

AerocivicLB - '92 Honda Civic CX
Team Honda
90 day: 55.14 mpg (US)

Camryglide - '20 Toyota Camry hybrid LE
90 day: 63.11 mpg (US)
Thanks: 11
Thanked 642 Times in 289 Posts
Measure the drag coefficient of your car
__________________
aerocivic.com
  Reply With Quote
Old 03-03-2009, 12:18 PM   #228 (permalink)
EcoModding Lurker
 
Join Date: Mar 2009
Location: Anderson, SC
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Basjoos, I was actually searching for some help with an odd windshield wiper issue on my old '98 Civic and stumbled in..... Just wanted to say beautiful job on the AeroCivic!

Regards,
Tom ~ WV6Z in Anderson, SC
  Reply With Quote
Old 03-03-2009, 05:44 PM   #229 (permalink)
Master EcoModder
 
basjoos's Avatar
 
Join Date: Dec 2007
Location: Upstate SC
Posts: 1,073

Aerocivic - '92 Honda Civic CX
Last 3: 70.54 mpg (US)

AerocivicLB - '92 Honda Civic CX
Team Honda
90 day: 55.14 mpg (US)

Camryglide - '20 Toyota Camry hybrid LE
90 day: 63.11 mpg (US)
Thanks: 11
Thanked 642 Times in 289 Posts
Quote:
Originally Posted by WV6Z View Post
Basjoos, I was actually searching for some help with an odd windshield wiper issue on my old '98 Civic and stumbled in..... Just wanted to say beautiful job on the AeroCivic!

Regards,
Tom ~ WV6Z in Anderson, SC
Hey, a neighbor! I've driven through Anderson a few times in my Aerocivic and visited a small Honda repair shop in the west end of town one time to get some parts. When I pulled into the shop, the mechanic said it looked like the martians were landing as I silently rolled up their driveway with the engine off.
__________________
aerocivic.com
  Reply With Quote
Old 03-03-2009, 05:54 PM   #230 (permalink)
Master EcoModder
 
basjoos's Avatar
 
Join Date: Dec 2007
Location: Upstate SC
Posts: 1,073

Aerocivic - '92 Honda Civic CX
Last 3: 70.54 mpg (US)

AerocivicLB - '92 Honda Civic CX
Team Honda
90 day: 55.14 mpg (US)

Camryglide - '20 Toyota Camry hybrid LE
90 day: 63.11 mpg (US)
Thanks: 11
Thanked 642 Times in 289 Posts
Added another minor aero tweak. I took a page out of Aptera's book and installed ducts to exhaust my cabin air into the small low pressure eddy behind the license plate. I doubt I will notice any difference in mileage, but every little bit helps and it should help to move the cabin air with less fan assist.
Vent holes at back of cargo area.

Other end of ducts opening into area behind license plate.

License plate installed with 1/2" gap behind plate.

__________________
aerocivic.com
  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
aero mods-data-% change or Cd change ( installment # 7-Wheels/Tires/Wheelcovers/etc. aerohead Aerodynamics 5 06-04-2014 12:14 PM
[aero-mods(aft-body streamlining/boat-tails)Part-3 History/Timeline cont'd aerohead Aerodynamics 10 08-13-2010 12:50 AM
mods-data-% change or Cd change( installment#5-roofline data) aerohead Aerodynamics 3 09-26-2009 02:01 PM
Build Thread Key Postings Index Experiment. TestDrive Forum News & Feedback 7 02-15-2009 08:53 PM
Drafting and Cd reduction basjoos Aerodynamics 5 12-06-2008 10:45 PM



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