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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 04-20-2012, 12:00 PM   #61 (permalink)
Master EcoModder
 
Join Date: Oct 2009
Location: Midwest
Posts: 337
Thanks: 4
Thanked 37 Times in 21 Posts
Can you post up an excel file with the calculations? I would love to play around with comparing different vehicles and weights. I know I can just use the online one, but then i've got like 5 windows open and have to copy and paste the data to my excel file to side by side compare more easily.

Thanks.

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 04-20-2012, 12:28 PM   #62 (permalink)
EcoModding Apprentice
 
Join Date: Oct 2008
Location: Chile
Posts: 222

Mercedes 89 D - '89 Mercedes 300 E
90 day: 33.86 mpg (US)

Skodie - '09 Skoda Octavia TDI PD
90 day: 38.84 mpg (US)

1993 Mercedes 300D Turbo - '93 Mercedes Benz 300D Turbo W124
90 day: 26.19 mpg (US)

Crossie - '16 Subaru XV Crosstreak
90 day: 9.61 mpg (US)

Crossie - '16 Subaru XV Crosstreak
90 day: 33.34 mpg (US)
Thanks: 15
Thanked 9 Times in 7 Posts
Excel on aero resistance and power

Dear Steffen707,

I have the spreadsheet but cannot open it myself. I īdonīt have the proper program.

I think I saved it with Open Office and then I erased the program.

Give me yr email and I will send it to you anyway.

OldBeaver
__________________
Mercedes 300 D turbo 1993
  Reply With Quote
Old 04-20-2012, 01:41 PM   #63 (permalink)
Master EcoModder
 
Join Date: Oct 2009
Location: Midwest
Posts: 337
Thanks: 4
Thanked 37 Times in 21 Posts
email sent in pm
  Reply With Quote
Old 04-23-2012, 02:10 PM   #64 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 21,391

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: 58.72 mpg (US)
Thanks: 3,166
Thanked 6,019 Times in 3,120 Posts
Quote:
Originally Posted by steffen707 View Post
Can you post up an excel file with the calculations?
Post 57 links to another forum with a spreadsheet available for download. I'm not sure if it's the same one oldbeaver used:

http://ecomodder.com/forum/showthrea...tml#post184492
__________________
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 04-23-2012, 06:04 PM   #65 (permalink)
EcoModding Apprentice
 
Join Date: Oct 2008
Location: Chile
Posts: 222

Mercedes 89 D - '89 Mercedes 300 E
90 day: 33.86 mpg (US)

Skodie - '09 Skoda Octavia TDI PD
90 day: 38.84 mpg (US)

1993 Mercedes 300D Turbo - '93 Mercedes Benz 300D Turbo W124
90 day: 26.19 mpg (US)

Crossie - '16 Subaru XV Crosstreak
90 day: 9.61 mpg (US)

Crossie - '16 Subaru XV Crosstreak
90 day: 33.34 mpg (US)
Thanks: 15
Thanked 9 Times in 7 Posts
Tools for drag resistance and such...

Dear MetroMPG,

I used the tools provided by ecomodder here:

Aerodynamic & rolling resistance, power & MPG calculator - EcoModder.com

Enter to FORUM, then look for GARAGE & TOOLS

Choose TOOLS and there you are...

Luck !

OldBeaver
__________________
Mercedes 300 D turbo 1993
  Reply With Quote
Old 04-23-2012, 11:59 PM   #66 (permalink)
Master EcoModder
 
Join Date: Oct 2009
Location: Midwest
Posts: 337
Thanks: 4
Thanked 37 Times in 21 Posts
Quote:
Originally Posted by MetroMPG View Post
Post 57 links to another forum with a spreadsheet available for download. I'm not sure if it's the same one oldbeaver used:

http://ecomodder.com/forum/showthrea...tml#post184492
The spreadsheet discussed on post 51 isn't the same as the one on the tools section. It is a whole lot more complex, which isn't BAD, but i was hoping to get the simple version found on the tools section.
  Reply With Quote
Old 05-22-2012, 06:52 PM   #67 (permalink)
EcoModding Lurker
 
Join Date: Jan 2012
Location: Southern Indiana
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
thank you!
  Reply With Quote
Old 08-20-2012, 11:47 AM   #68 (permalink)
EcoModding Apprentice
 
ERTW's Avatar
 
Join Date: Jan 2012
Location: Toronto
Posts: 120

Bu - '08 Chevrolet Malibu LS
90 day: 32.29 mpg (US)
Thanks: 50
Thanked 65 Times in 31 Posts
Fe vs road speed is an inverted bathtub. This spreadsheet is only useful within a small speed range (around 80kph).
  Reply With Quote
Old 11-17-2012, 02:16 PM   #69 (permalink)
EcoModding Lurker
 
Join Date: Apr 2011
Location: MD
Posts: 2

Corolla - '88 Toyota Corolla LE
90 day: 32.6 mpg (US)
Thanks: 1
Thanked 0 Times in 0 Posts
Hello, Ive been a long time lurker here on this board - a search usually finds the information I'm interested in, so I haven't ever really needed to post.

I am trying to derive a simple (read: very simple - no Crr, Δm, a, etc.) mathematical model for the rate of fuel consumption with regards to air resistance only, assuming constant V and m.
So far I've gotten:

B=(BSFC/ρη)Fd

Where η, efficiency, Fd, drag force, and ρ, energy density, are known.
η=1/(BSFC*ρ) => BSFC=1/(η*ρ)
B=fuel consumption (which I'm ultimately trying to find in gal/100mi).

I figure this would be the correct thread. Am I on the right track? If not, any insight would be great.

Thanks, and nice to finally meet everyone!
  Reply With Quote
Old 11-17-2012, 04:50 PM   #70 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 10,856
Thanks: 17,144
Thanked 5,810 Times in 3,502 Posts
fuel consumption

Quote:
Originally Posted by 88'rolla View Post
Hello, Ive been a long time lurker here on this board - a search usually finds the information I'm interested in, so I haven't ever really needed to post.

I am trying to derive a simple (read: very simple - no Crr, Δm, a, etc.) mathematical model for the rate of fuel consumption with regards to air resistance only, assuming constant V and m.
So far I've gotten:

B=(BSFC/ρη)Fd

Where η, efficiency, Fd, drag force, and ρ, energy density, are known.
η=1/(BSFC*ρ) => BSFC=1/(η*ρ)
B=fuel consumption (which I'm ultimately trying to find in gal/100mi).

I figure this would be the correct thread. Am I on the right track? If not, any insight would be great.

Thanks, and nice to finally meet everyone!
If you have a baseline mpg at a steady 55-mph,or 70-mph,and have made changes which affect only the drag coefficient,then the following relationships developed by General Motors, may be used with a high degree of confidence:
*A 10% drag reduction @ 55-mph will yield a 5% increase in mpg .
*A 10% drag reduction @ 70-mph will yield a 6% increase.
From here.you can convert into any useful unit of measure.
The relationship presumes a constant BSFC,and it has been reported by others that proper gear-matching is necessary to derive the full benefit of the drag reduction,but thermodynamically,the percentages are correct.

__________________
Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
  Reply With Quote
The Following 2 Users Say Thank You to aerohead For This Useful Post:
88'rolla (11-18-2012), mikeyjd (09-14-2013)
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
CdA list Daox Aerodynamics 161 05-27-2019 08:09 AM
Top 5 most fuel efficient tires (Lowest Rolling resistance: LRR) blackjackel General Efficiency Discussion 144 01-25-2016 11:39 PM
Calculating Rolling Resistance SVOboy EcoModding Central 2 02-15-2012 08:43 PM
Sources of Aerodynamic Drag in Automobiles and Possible Solutions SVOboy Aerodynamics 12 02-17-2010 02:09 PM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com