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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 03-17-2018, 02:48 PM   #21 (permalink)
Master EcoModder
 
Join Date: May 2012
Location: Indiana
Posts: 1,252

Traverse 2LT FWD - '12 Chevrolet Traverse 2LT

Volt, gas only - '12 Chevrolet Volt Premium
90 day: 38.88 mpg (US)

Volt, electric only - '12 Chevrolet Volt Premium
90 day: 119.92 mpg (US)
Thanks: 101
Thanked 266 Times in 175 Posts
What about commercial truck tires, duals vs single? Don't they claim rolling resistance reduction?

__________________




  Reply With Quote
The Following User Says Thank You to ksa8907 For This Useful Post:
aerohead (03-17-2018)
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 03-17-2018, 03:29 PM   #22 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 8,492
Thanks: 10,709
Thanked 4,488 Times in 2,500 Posts
super-singles

Quote:
Originally Posted by ksa8907 View Post
What about commercial truck tires, duals vs single? Don't they claim rolling resistance reduction?
Originally,in the 1980s,the super-single,'floatation' tires were credited with a 20% reduction in rolling resistance.
__________________
Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
  Reply With Quote
Old 03-17-2018, 04:02 PM   #23 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 10,298
Thanks: 2,285
Thanked 3,249 Times in 2,557 Posts
Given the depth being brought out in this discussion, perhaps I should pose this question:



OEM on the Dasher was 13", there is a rusty dry-rotted example in the spare tire well. Current fitment is 14x~6.5" Ronal R-8s with 195-60/14s. What I choose as a goal is to have a summer and winter set of wheels, to spread out wear and replacement (yeah, right). The summer wheels at 14" locks in the 195/60 size circumference. I can't afford to lose the current overall ratio.

For winter what I would like is 15" steelies. What I understand is that mud, snow and ice all require difference treads and compounds. Sidewalls that virtue signal battlecar status is probably more important than actual off-road performance.

Hydroplaning resistance is right up there.
__________________
.
Walk without rhythm and it won't attract the worm. --fatboy slim
_________________
  Reply With Quote
The Following User Says Thank You to freebeard For This Useful Post:
aerohead (03-17-2018)
Old 03-17-2018, 04:37 PM   #24 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 8,492
Thanks: 10,709
Thanked 4,488 Times in 2,500 Posts
winter/summer

Living in basically a 3-season clime,I've never had to face a 'real' winter at home.Snow is pretty rare.
I have driven in the snows of Texas,New Mexico,Colorado,Utah,Wyoming,........... up into southern Canada.All on all-season radials.
They weren't perfect but they did get me there and home okay.
I suspect that there are some really killer ice and snow tires out there.
Subaru's appear to be undaunted in ice driving.
__________________
Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
  Reply With Quote
The Following User Says Thank You to aerohead For This Useful Post:
freebeard (03-17-2018)
Old 03-17-2018, 05:44 PM   #25 (permalink)
EcoModding Lurker
 
Join Date: Jun 2009
Location: Vancouver, BC
Posts: 43
Thanks: 0
Thanked 30 Times in 15 Posts
Well I just found 4 brand new Civic SI rims at a dealership, removed from a '18 civic at a good price. Dealership offers Michelin defender t & h tires and BF Goodrich Advantage TA's in the size I need.
Going to look up RR on those and investigate a couple others too. The rims are pretty flat with moderate size holes, but overall pretty aero.
  Reply With Quote
Old 03-17-2018, 05:46 PM   #26 (permalink)
EcoModding Lurker
 
Join Date: Jun 2009
Location: Vancouver, BC
Posts: 43
Thanks: 0
Thanked 30 Times in 15 Posts
Click image for larger version

Name:	IMG_1766.jpg
Views:	26
Size:	25.3 KB
ID:	23701
  Reply With Quote
Old 03-17-2018, 05:47 PM   #27 (permalink)
EcoModding Lurker
 
Join Date: Jun 2009
Location: Vancouver, BC
Posts: 43
Thanks: 0
Thanked 30 Times in 15 Posts
They are going to look pretty swank on my 20 year old beige dad van...
  Reply With Quote
Old 03-17-2018, 08:13 PM   #28 (permalink)
Cyborg ECU
 
California98Civic's Avatar
 
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 4,410

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 60.02 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
Thanks: 1,571
Thanked 1,220 Times in 817 Posts
Quote:
Originally Posted by aerohead View Post
Some other reports which confirmed a direct correlation between tire width and aero drag were found with the:
*Pontiac Trans Am
*Subaru XT
Also,many of the lowest drag concept cars ran narrow tires as a low-drag strategy,including:
*GM Aero 2000
*GM Aero 2002
*GM Aero 2003
*Renault Vesta-II
*Ford Probe-IV
*LOREMO
*Daihatsu UFE I,II,III
*VW 1-Liter 2002
*VW 1L c 2009
*VW XL1 2016
Thx aeohead. If it was part of the plan for the XL1, then that settles it for me. But Capriracer's point above that tires have less air flow exposure than we might assume because they are mostly in the wheel well... How significant, do you think that is?
__________________


See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.

  Reply With Quote
Old 03-17-2018, 10:06 PM   #29 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 10,298
Thanks: 2,285
Thanked 3,249 Times in 2,557 Posts
Quote:
...because they are mostly in the wheel well... How significant, do you think that is?
Wheels are actually pretty generic, wheel wells vary as much as people's belly buttons.
__________________
.
Walk without rhythm and it won't attract the worm. --fatboy slim
_________________
  Reply With Quote
Old 03-17-2018, 10:39 PM   #30 (permalink)
Tyrant-at-large
 
Vman455's Avatar
 
Join Date: Feb 2012
Location: Champaign, IL
Posts: 917

Little Red - retired - '05 Honda Civic EX
90 day: 49.03 mpg (US)

Pope Pious the Prius - '13 Toyota Prius Two
Team Toyota
90 day: 52.27 mpg (US)
Thanks: 83
Thanked 787 Times in 382 Posts
Quote:
Originally Posted by California98Civic View Post
Thx aeohead. If it was part of the plan for the XL1, then that settles it for me. But Capriracer's point above that tires have less air flow exposure than we might assume because they are mostly in the wheel well... How significant, do you think that is?
Well (ha ha!), Hucho cites two researchers who found that "the flow around the lower part of a wheel remains very much the same as for a free wheel, and according to A. Morelli a wheel's drag coefficient (referenced to its own exposed frontal area) remains almost constant." The effect here seems clear: smaller tire=less drag. And in yaw, which front tires typically experience ~15 degrees, the drag increases 3x, so any reduction in area would have more effect as well.

However, since we're working with production cars, there is another consideration, wheel housing volume to wheel volume ratio. As that ratio increases (as you would get fitting a narrower, lower volume tire in an existing wheel housing), drag goes up too, about ten counts for every doubling of the ratio. And lift coefficient increases 5x as fast, 50 counts for every doubling. But, it's unclear what effect a smaller volume, narrow tire that still fills the area of the wheel opening would have; Hucho doesn't cite any data on that, and while I think I have a PDF or two on that, they're on my other computer. I'll see if I can find them tomorrow.

__________________

  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com