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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 11-22-2009, 02:58 AM   #111 (permalink)
Wanderer
 
Sorrow Six Star's Avatar
 
Join Date: Nov 2009
Location: Birmingham
Posts: 90

Winona - '86 Subaru XT DL
Thanks: 20
Thanked 3 Times in 2 Posts


that's awesome!

but not as awesome as the vortex gun...

just noticed the mini eclipse headlights nice touch!
^^ oops *tail lights


Last edited by Sorrow Six Star; 11-22-2009 at 11:09 PM..
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 11-22-2009, 06:44 AM   #112 (permalink)
aero guerrilla
 
Piwoslaw's Avatar
 
Join Date: Oct 2008
Location: Warsaw, Poland
Posts: 3,541

Svietlana II - '13 Peugeot 308SW e-HDI 6sp
90 day: 58.1 mpg (US)
Thanks: 1,056
Thanked 628 Times in 395 Posts
Quote:
Nice job Majestic
Now, why does it remind me of Darth Vader?
__________________
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

Piwoslaw's Peugeot 307sw modding thread

  Reply With Quote
Old 11-22-2009, 07:43 AM   #113 (permalink)
Gen II Prianista
 
Rokeby's Avatar
 
Join Date: Jul 2009
Location: Ballamer, Merlin
Posts: 453
Thanks: 201
Thanked 145 Times in 89 Posts
It somewhat resembles an aardvark's head, without the ears, of course:

Click image for larger version

Name:	AARDVARK.gif
Views:	32
Size:	12.3 KB
ID:	4799

Aardvarks sometimes suffer from self image issues:

Click image for larger version

Name:	drunk_aardvark.jpg
Views:	34
Size:	26.2 KB
ID:	4800
  Reply With Quote
Old 11-22-2009, 10:38 AM   #114 (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 Rokeby View Post
In a smaller size, camouflaged as a tail pipe, it would be very useful to
express displeasure to tailgaters.

Smaller?!? I think it would make the perfect substructure for a boattail as it is!
  Reply With Quote
Old 11-22-2009, 10:56 AM   #115 (permalink)
Cd
Ultimate Fail
 
Cd's Avatar
 
Join Date: Feb 2008
Location: Austin,Texas
Posts: 3,033
Thanks: 2,258
Thanked 756 Times in 439 Posts
Quote:
Originally Posted by majestic View Post
This is the best implementation of a boattail I have seen yet.

I would love to see you make a more permanent version, so I did a little photoshop, hope you don't mind!
YKYAEM when you have this as your desktop wallpapaer.
  Reply With Quote
Old 11-22-2009, 09:46 PM   #116 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 21,055

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

MPGiata - '90 Mazda Miata
90 day: 54.01 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 73.57 mpg (US)
Thanks: 2,842
Thanked 5,702 Times in 2,946 Posts
Some speed vs. MPG results

majestic: thanks for that image. The eventual permanent/removable version won't look that nice!

---

Did some testing today. Several significant disclaimers follow...

The chart shows speed vs. MPG in bi-directional runs on the same stretch of road.

Green line was a "baseline" for the car (included partial grille block & rear skirts),

Yellow/orange after installing the transmission with the taller final drive,

Blue = boat tail



Disclaimers: Also, the fuel use offset I'm using on the ScanGauge now is higher than those 2 tests (I don't think I recorded it then, actually), so all else being equal, my displayed MPG is actually slightly less now than it would have been then.
  • The 3 tests aren't strictly comparable for a bunch of reasons, not the least of which is weather conditions (temp) differing a lot
  • Ethanol in fuel now (5 or 10%, I forget which), but not when the first 2 tests were run
  • Cruise control was used for the previous testing, but I used my foot today. Even though I managed to keep the average speed dead on for 9/10 one-way runs (one run was off by 1 mph), the average doesn't tell the whole story - it's no where near as precise/consistent as cruise control.
  • The car is older, different weight oil in the engine, tires are more worn, spark plugs are probably worn more, etc. etc.

So take this as an "actual mileage may vary" comparison. The relative comparisons are not really accurate. But there's no doubt the absolute figures are satisfying, and they should get even better when I stick the undertray back on.

I'm going to try to do the A-B-A one day this week - its results should be a bit more accurate for relative numbers.
Attached Thumbnails
Click image for larger version

Name:	chart-boattail-speed-mpg.gif
Views:	3413
Size:	24.9 KB
ID:	4808  
__________________
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
The Following 3 Users Say Thank You to MetroMPG For This Useful Post:
aerohead (12-09-2009), HyperMileQC (05-29-2013), TEiN (11-22-2009)
Old 11-22-2009, 09:51 PM   #117 (permalink)
...beats walking...
 
Join Date: Jul 2009
Location: .
Posts: 6,191
Thanks: 179
Thanked 1,521 Times in 1,122 Posts
...it's interesting (??) to note the little "bump" in milage at 70 km in both the original (green) and new trans (yellow/orange) data.

...intake or exhaust "tuning" coming into play maybe?
  Reply With Quote
Old 11-22-2009, 10:02 PM   #118 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 21,055

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

MPGiata - '90 Mazda Miata
90 day: 54.01 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 73.57 mpg (US)
Thanks: 2,842
Thanked 5,702 Times in 2,946 Posts
Yes, it's weird. But since it's a single data point (average of 2 bi-dir runs) for each speed, I wouldn't read too much into any outliers.
__________________
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 11-22-2009, 10:05 PM   #119 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 21,055

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

MPGiata - '90 Mazda Miata
90 day: 54.01 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 73.57 mpg (US)
Thanks: 2,842
Thanked 5,702 Times in 2,946 Posts
Quote:
Originally Posted by Nerys View Post
so your getting 70mpg highway? ?? how exactly are you doing that?
Driving relatively slowly & attentively in a car with lots of mods!
__________________
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 11-22-2009, 10:05 PM   #120 (permalink)
...beats walking...
 
Join Date: Jul 2009
Location: .
Posts: 6,191
Thanks: 179
Thanked 1,521 Times in 1,122 Posts
...I'm just saying that "coincidence" it's probably NOT, especially in light of being both averaged and repeated in different configurations.

  Reply With Quote
Reply  Post New Thread


Tags
boat tail, testing

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Project: Rebuilding an '01 Honda Insight as a nonhybrid Fabio Hybrids 158 01-12-2013 11:59 AM
How to get instant fuel consumption from Megasquirt TELVM Instrumentation 11 08-29-2011 02:47 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