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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 07-23-2011, 01:50 PM   #1 (permalink)
Cyborg ECU
 
California98Civic's Avatar
 
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,299

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
Thanks: 2,373
Thanked 2,172 Times in 1,469 Posts
Does lift reduce rolling resistance significantly?

I suppose it must, and that it becomes dangerous at some threshold because cars don't have wings... but if I add a belly pan and add lift as a result part of my FE gain might come from reduced rolling resistance? I would assume cars are designed with the assumption their owners will speed sometimes far above 65mph... but what if I never speed and allow my car to have more lift than originally designed? I gain FE, it seems. No?

__________________
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
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 07-23-2011, 01:54 PM   #2 (permalink)
EcoModding Lurker
 
Join Date: Jun 2011
Location: Oakland, Ca
Posts: 71

'10 Kia Forte EX 2.0 - '10 Kia Forte EX
90 day: 37.29 mpg (US)
Thanks: 4
Thanked 2 Times in 2 Posts
Lift exposes more tire, which is where the penalty tends to be.
__________________
  Reply With Quote
Old 07-23-2011, 02:00 PM   #3 (permalink)
(:
 
Frank Lee's Avatar
 
Join Date: Jan 2008
Location: up north
Posts: 12,762

Blue - '93 Ford Tempo
Last 3: 27.29 mpg (US)

F150 - '94 Ford F150 XLT 4x4
90 day: 18.5 mpg (US)

Sport Coupe - '92 Ford Tempo GL
Last 3: 69.62 mpg (US)

ShWing! - '82 honda gold wing Interstate
90 day: 33.65 mpg (US)

Moon Unit - '98 Mercury Sable LX Wagon
90 day: 21.24 mpg (US)
Thanks: 1,585
Thanked 3,555 Times in 2,218 Posts
Less weight on the tire leads to less rolling resistance HOWEVER the very act of creating lift causes more drag, which more than cancels out any rolling resistance reduction.

I'd think there's the circumstance where a vehicle has negative lift (downforce) and if that were to be neutralized you have reduced drag AND reduced rolling resistance... but downforce amongst our garden-variety street vehicles is quite rare.

__________________


  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com