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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 06-10-2008, 08:05 PM   This thread is in the EcoModder Project Library | #1 (permalink)
Master EcoModder
 
NeilBlanchard's Avatar
 
Join Date: May 2008
Location: Maynard, MA Eaarth
Posts: 7,008

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: 2,095
Thanked 2,054 Times in 1,238 Posts
Scion xA aero mods

Greetings,

I've been testing some aero mods -- using good old duct tape, for the moment.





Simple stuff so far, and it seems to be quite effective: my best tankful average last year was 41.8mpg, and with some improved driving techniques, I got 43.5mpg on a tank. After covering the upper grill, I've got a new best of 45.5mpg. Then I covered the fog light recesses, and it's looking much better still!

The 45.5mpg tank was ~239 miles at the half tank -- and this tank is sitting at ~275 miles at a half a tank left! So if I do only 200 miles on the second half tank, that could be ~47.5mpg! Heck -- I might be on course to do almost 50mpg?! Incredible, if that's how it turns out.

[Edit: I ended up with 46.4mpg, partly because my last commute up Route 3/93/95 and on Route 117 was pretty clogged with stop and go traffic...]


So, I'm going to be trying to construct an even sleeker nose -- if I can form some planes to kick the air flow out and around the front wheels, and keep the required cooling (today was very hot -- near 100F and it worked fine!), then I could be exceeding what I thought this car was capable of.

__________________
Sincerely, Neil

http://neilblanchard.blogspot.com/

Last edited by NeilBlanchard; 06-15-2008 at 10:29 PM.. Reason: corrected mileage numbers -- I forgot my current best. D'oh!
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 06-10-2008, 08:29 PM   #2 (permalink)
EcoModding Lurker
 
Join Date: Jun 2008
Location: Stoughton, WI
Posts: 55

Polymer - '89 Honda Civic Hatch Std 4 speed
90 day: 51.49 mpg (US)

Woodstock - '69 MG Midget 1275

Nekobus - '06 Scion xB
Thanks: 0
Thanked 2 Times in 2 Posts
The truth will come out in 4-5 tanks.

My mileage swings up and down by almost 10mpg on each tank, depending on when the bloody pump shuts off the nozzle. I don't take the risk of topping off repeatedly like some. I do slow the pump down when I know it's nearing the top though - makes for a little more consistency.

I'm quite interested to see what sort of improvements you can make. I've got an xB and may be in the market for a replacement car for my aging civic.
__________________
  Reply With Quote
Old 06-10-2008, 08:34 PM   #3 (permalink)
Administrator
 
Daox's Avatar
 
Join Date: Dec 2007
Location: Germantown, WI
Posts: 10,552

CM400E - '81 Honda CM400E
90 day: 39.62 mpg (US)

Daox's Grey Prius - '04 Toyota Prius
Team Toyota
90 day: 49.53 mpg (US)

Daox's Insight - '00 Honda Insight
90 day: 64.33 mpg (US)

Swarthy - '14 Mitsubishi Mirage DE
90 day: 41.67 mpg (US)
Thanks: 1,978
Thanked 2,112 Times in 1,292 Posts
Can't wait to hear what the next tank is Neil. Looks like its comming along well.

Thats some huge variance millenniumtree! My tanks in my Matrix vary about 3 mpg (40-43) and there are two different people driving it.
__________________
Current project: Heating the manual trans with engine coolant
  Reply With Quote
Old 06-10-2008, 08:34 PM   #4 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 20,327

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

MPGiata - '90 Mazda Miata
90 day: 50.45 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 64.43 mpg (US)
Thanks: 2,376
Thanked 5,221 Times in 2,652 Posts
Neil: that's encouraging. A 1.7 mpg gain works out to a 3.9% increase.

I did a number of non-rigorous "A" (5 controls) - "B" (2 grille block) runs and saw an average 2.9% gain @ highway speeds.
__________________
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 06-10-2008, 08:44 PM   #5 (permalink)
EcoModding Seige Tank
 
digitaldissent's Avatar
 
Join Date: May 2008
Location: San Diego, CA
Posts: 159

yarii - '07 Toyota Yaris 4dr (auto)
90 day: 41.37 mpg (US)

Bullet Bill - '07 Toyota Yaris 2dr hatch
90 day: 36.19 mpg (US)
Thanks: 0
Thanked 0 Times in 0 Posts
looking good, I think I will just tape over my fog light spots like you for now.

I got a little bump with the upper grill block too, wonder if it will last
__________________

I am not trying to save the planet, just trying to hurt it a little less

Yaris build thread

what is... http://en.wikipedia.org/wiki/COINTELPRO
  Reply With Quote
Old 06-10-2008, 08:56 PM   #6 (permalink)
Philthy
 
Join Date: Feb 2008
Location: lexington, ky
Posts: 36

craggin' wagon - '01 Subaru Outback
Thanks: 0
Thanked 1 Time in 1 Post
I didn't see much improvement on my grill block but that could be for many reasons. One questions I have is this, is it better to block the upper grill or lower grill? I have a Subaru Outback with the lower grill blocked and the upper grill open. I chose to do the lower one cause it was a bigger opening but it may be at the stagnant point anyhow so the blocking the upper grill may be better for smoothing flow over the hood. any thoughts?
  Reply With Quote
Old 06-10-2008, 09:05 PM   #7 (permalink)
Administrator
 
Daox's Avatar
 
Join Date: Dec 2007
Location: Germantown, WI
Posts: 10,552

CM400E - '81 Honda CM400E
90 day: 39.62 mpg (US)

Daox's Grey Prius - '04 Toyota Prius
Team Toyota
90 day: 49.53 mpg (US)

Daox's Insight - '00 Honda Insight
90 day: 64.33 mpg (US)

Swarthy - '14 Mitsubishi Mirage DE
90 day: 41.67 mpg (US)
Thanks: 1,978
Thanked 2,112 Times in 1,292 Posts
Thats the general consensus. If your going to block one, the upper helps more with aero.
__________________
Current project: Heating the manual trans with engine coolant
  Reply With Quote
Old 06-10-2008, 09:11 PM   #8 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 20,327

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

MPGiata - '90 Mazda Miata
90 day: 50.45 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 64.43 mpg (US)
Thanks: 2,376
Thanked 5,221 Times in 2,652 Posts
You're right on: all else being equal, better to block the upper opening and send air that's already above the stagnation point over/around the car where there's less drag. Feed air that's below the stagnation point through the radiator, since it was going to end up in the turbulence underneath the car anyway.
__________________
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 06-10-2008, 09:20 PM   #9 (permalink)
Philthy
 
Join Date: Feb 2008
Location: lexington, ky
Posts: 36

craggin' wagon - '01 Subaru Outback
Thanks: 0
Thanked 1 Time in 1 Post
sweet, i'll have to try that. I think it will make for a prettier mod too.
  Reply With Quote
Old 06-10-2008, 09:26 PM   #10 (permalink)
Master EcoModder
 
NeilBlanchard's Avatar
 
Join Date: May 2008
Location: Maynard, MA Eaarth
Posts: 7,008

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: 2,095
Thanked 2,054 Times in 1,238 Posts
Hi,

I blocked the upper one because it is flush (the lower one is recessed) and it helps the air flow up over the hood. Also, the standard upper grill is more closed than mine is, so I felt more confident going without the cooling air. And there is the slot just above the bumper, too.

It worked perfectly well today in very slow/stopped traffic on Route 128 with the temps in the upper 90's.

__________________
Sincerely, Neil

http://neilblanchard.blogspot.com/
  Reply With Quote
Reply  Post New Thread


Tags
grille block

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
List of aero mods you can do to your vehicle MetroMPG Aerodynamics 110 09-15-2016 08:25 PM
Scion XA in PA goodblues Introductions 25 08-27-2010 08:49 AM
Aero mods on 06 civic c0da Aerodynamics 28 05-20-2009 03:17 PM
Planning Aero Mods Doofus McFancypants Aerodynamics 30 06-15-2008 06:03 PM
Saturn aero mods? Heynow999 Aerodynamics 5 05-05-2008 06:44 PM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2018, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com