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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 02-12-2010, 09:32 AM   #1 (permalink)
EcoModding Lurker
 
Join Date: Nov 2009
Location: poughquag new york USA
Posts: 69

old red taco - '02 toyota tacoma regular cab
90 day: 29.49 mpg (US)
Thanks: 1
Thanked 27 Times in 15 Posts
nascar trucks?

i can across this picture on the internet and i figure that the nascar truck teams must do more aerodynamic testing than anyone. i think that they do not use a aerocap design because i would imagine that the truck sponsors want the trucks to resemble a production truck. so i am wondering if the same results as a aero cap can be achieved with a torrnea cover and a rear spoiler? does the air going over the truck pass over top of cab and then the rear spoiler act as if there is a aero cap on the truck?

also i am wondering why they went with a air dam instead of a belly pan? i can see that the truck is lowered and the air dam is really close to the road with side skirts

i know their concern is not fuel economy but the aerodynamics must apply to fuel economy





[IMG][/IMG]

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 02-12-2010, 09:55 AM   #2 (permalink)
Moderate your Moderation.
 
Join Date: Nov 2008
Location: Troy, Pa.
Posts: 8,919

Pasta - '96 Volkswagen Passat TDi
90 day: 45.22 mpg (US)
Thanks: 1,369
Thanked 430 Times in 353 Posts
Well, they do and don't.

They're more interested in downforce than anything else, which is nice for when you're going 200 MPH around a corner, ya know?

I'll try to find it again, there was a webpost somewhere (that I probably didn't save) which detailed the Cd and A of the newest NASCAR vehicles, including the trucks. IIRC, they were about average for our purposes, but can make 1,000's of lbs of downforce at speed.
__________________
"ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"

  Reply With Quote
Old 02-12-2010, 11:41 AM   #3 (permalink)
Aero Deshi
 
ChazInMT's Avatar
 
Join Date: Jan 2010
Location: Vero Beach, FL
Posts: 1,065

MagMetalCivic - '04 Honda Civic Sedan EX
Last 3: 34.25 mpg (US)
Thanks: 430
Thanked 668 Times in 357 Posts
Yeah, Downforce...I say it's over rated. But 4 out of 5 NASCAR crew chiefs recommend it for their drivers.

Attached Thumbnails
Click image for larger version

Name:	CarlsWreck.jpg
Views:	291
Size:	105.7 KB
ID:	5600  
  Reply With Quote
Old 02-12-2010, 12:39 PM   #4 (permalink)
Master EcoModder
 
Join Date: Jun 2008
Location: Earth
Posts: 5,209
Thanks: 225
Thanked 808 Times in 592 Posts
Hey, that's cheating! No fair passing by flying over the car ahead.
  Reply With Quote
Old 02-12-2010, 01:05 PM   #5 (permalink)
...beats walking...
 
Join Date: Jul 2009
Location: .
Posts: 6,190
Thanks: 179
Thanked 1,522 Times in 1,123 Posts
...Motorsport News headline: "Leap Frogging driving technique not quite perfected at Daytona."
  Reply With Quote
Old 02-12-2010, 04:17 PM   #6 (permalink)
(:
 
Frank Lee's Avatar
 
Join Date: Jan 2008
Location: up north
Posts: 12,755

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: 1,582
Thanked 3,541 Times in 2,211 Posts
That air dam is too low for the street but I'd imagine it's so low that a belly pan would be largely redundant i.e. a pan would do little good.
__________________


  Reply With Quote
Old 02-13-2010, 02:21 AM   #7 (permalink)
Getting BETTER Mileage
 
Jethro's Avatar
 
Join Date: Dec 2009
Location: Los Alamos, NM
Posts: 108

Lucky No 19 - '11 Ram 1500 Express ST

Venti - '13 Ram 2500 Tradesman
Thanks: 6
Thanked 18 Times in 8 Posts
I'm sure, knowing Nascar that there are restrictions as to what can be done to the underbody as well.
__________________
- Greg
  Reply With Quote
Old 02-13-2010, 07:39 AM   #8 (permalink)
EcoModding Apprentice
 
micondie's Avatar
 
Join Date: Mar 2009
Location: Western Mass
Posts: 104

moby van - '03 Dodge Caravan SE
90 day: 19.74 mpg (US)
Thanks: 0
Thanked 5 Times in 5 Posts
Both the design of the air dam and the rear spoiler are specified by NASCAR
  Reply With Quote
Old 02-13-2010, 03:03 PM   #9 (permalink)
Left Lane Ecodriver
 
RobertSmalls's Avatar
 
Join Date: Aug 2008
Location: Buffalo, NY, USA
Posts: 2,257

Prius C - '12 Toyota Prius C
Thanks: 79
Thanked 284 Times in 197 Posts
Disappointingly, a Google Image Search for "salt flats pickup truck" doesn't yield anything more than airdams and tonneau covers.



^ Desperately needs rear wheel skirts and a teardrop-shaped bed.
  Reply With Quote
Old 02-13-2010, 03:40 PM   #10 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 12,453
Thanks: 20,018
Thanked 6,223 Times in 3,842 Posts
wondering

Quote:
Originally Posted by ccrider View Post
i can across this picture on the internet and i figure that the nascar truck teams must do more aerodynamic testing than anyone. i think that they do not use a aerocap design because i would imagine that the truck sponsors want the trucks to resemble a production truck. so i am wondering if the same results as a aero cap can be achieved with a torrnea cover and a rear spoiler? does the air going over the truck pass over top of cab and then the rear spoiler act as if there is a aero cap on the truck?

also i am wondering why they went with a air dam instead of a belly pan? i can see that the truck is lowered and the air dam is really close to the road with side skirts

i know their concern is not fuel economy but the aerodynamics must apply to fuel economy





[IMG][/IMG]
cc, the teams spend an enormous amount in wind tunnel time to evaluate drag vs downforce.
NASCAR probably forbids aeroshells as they would not match 'Templates' used by officials to 'pass' vehicles.
A carefully designed cab-wing/sail panel,along with a 1/2-tonneau can approach the drag reduction of an aeroshell.
The locked-vortex behind the cab,and above the tonneau on the NASCAR truck creates a 'phantom' shell with outer flow skipping over.
The rear spoiler is only for downforce.
The airdam and skirts form a duct which allows the low base pressure of the wake to communicate underneath for downforce.More drag.
Hucho uses the term 'minimum' for airdams.Too much of a good thing and your drag begins to go back up.And the drag increase can be remarkable!

  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Court Voids Mileage Standards for Light Trucks SVOboy General Efficiency Discussion 6 01-13-2013 04:27 AM
NASCAR and Formula 1 V8 engine comparison. Peter7307 The Lounge 7 07-24-2009 03:40 PM
NASCAR "Advanced Fuel Economy Dodge"; NASCAR Prius model coming soon! MetroMPG The Lounge 9 07-14-2009 01:35 PM
NASCAR "Advanced Fuel Economy Dodge"; Prius branded model coming soon! MetroMPG The Lounge 0 07-08-2009 08:20 AM
Benefits of drafting "dirty" trucks? SmittyNC Aerodynamics 38 12-05-2008 10:37 PM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com