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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 09-22-2008, 05:21 PM   #31 (permalink)
Master EcoModder
 
Join Date: Jul 2008
Location: Silly-Con Valley
Posts: 1,479
Thanks: 201
Thanked 262 Times in 199 Posts
Quote:
Originally Posted by SuperTrooper View Post
The Plymouth Superbird had 'em.
My understanding is that those were actually added to the production cars because the race cars, when lowered and then running on the banked turns, would rub the tire against the top of the fender. So they chopped a hole to make a little room, and stuck the "vent" on it, then they had to do the same thing to the production cars so they could use it on the racer.

Not sure if that is actually true, or "urban myth".

-soD

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 09-22-2008, 06:20 PM   #32 (permalink)
Master EcoModder
 
Join Date: Feb 2008
Location: belgium
Posts: 663

vectra a - '95 Opel Vectra GLS
90 day: 37.51 mpg (US)
Thanks: 14
Thanked 61 Times in 44 Posts
i've heared that story too but i think it was something they tolled about the vents to confuse the competition...since the true function of these things still discussed here today i think they did a pretty good job.
__________________
aerˇoˇdyˇnamˇics: the science of passing gass

*i can coast for miles and miles and miles*
  Reply With Quote
Old 10-22-2008, 04:08 PM   #33 (permalink)
Pokémoderator
 
cfg83's Avatar
 
Join Date: Dec 2007
Location: Southern California
Posts: 5,864

1999 Saturn SW2 - '99 Saturn SW2 Wagon
Team Saturn
90 day: 40.49 mpg (US)
Thanks: 439
Thanked 530 Times in 356 Posts
Sayyad -

Quote:
Originally Posted by Sayyad View Post
The vents on the Jetta are likely fully functional but they'd be installed to vent hot air from the engine bay, most likely.
I finally saw the Jetta again last week, and you are correct. The wheel well had no interior holes/slots/connections to the louver vents, so it must be for the engine.

CarloSW2
__________________

What's your EPA MPG? Go Here and find out!
American Solar Energy Society
  Reply With Quote
Old 10-24-2008, 11:18 PM   #34 (permalink)
EcoModding Lurker
 
Join Date: Jul 2008
Location: Fargo, ND
Posts: 45

MarzyPan - '95 Honda Civic 2000 Si Running Gear
Thanks: 1
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by lunarhighway View Post
i've heared that story too but i think it was something they tolled about the vents to confuse the competition...since the true function of these things still discussed here today i think they did a pretty good job.
Aero Warriors - The <I>Scoop</I> On The Scoops

This is the most comprehensive explanation of the superbird / daytona's fender vents. I also vaguely remember hearing that these vents were designed to help remove rubber build up on modern racing cars with their ultra soft rubber compounds.
  Reply With Quote
Old 01-20-2013, 03:13 PM   #35 (permalink)
EcoModding Lurker
 
Join Date: Jan 2013
Location: United States
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Wink For Tango Charlie

Just joined tonight (UK Time). I was doing a bit of research into some new race car programs and came across the 'Louvres/Louvers discussioin.
Long story short, I reckon you are almost bang on the money. I have put louvres into car panels always wtih the open face away from airiflow. The proifile in side view does not detract from the overall CD of the vehicle as the overall profile will do much more to govern drag and aero coefficients.
However there is alway a low pressure 'dam' at the base of windsheilds and all the louvres but the overall airflow goes past that., thus providing an evacuation effect on that area. This can also be effected by the top view profile of the car and curvature. You can see it in a wind tunnel quite effecifvely. Back to the Fender thing, you are correct in saying that eg. in some LeMans prototype cars the louvre sets can run pretty far back along the top fender surface and this does indeed provide relief to high pressure built up in the Fenderwell due to wheel and tire rotation. In fact most good race cars have greater Wheel and tire offset to bring the rotational "disc' out towards the main body airflow and thus dissipate it that way. Other ways are to use reverse NACA ducts to bring any excess back thru the underbody aerodynamics package to cool both engine, exhaust and rear brakes before putting it to full use via the difusser package to give you the downforce required to keep it hopefully 'glued' down!
Hope it make sense.
  Reply With Quote
Old 01-24-2013, 01:22 PM   #36 (permalink)
EcoModding Lurker
 
Join Date: Nov 2011
Location: United States
Posts: 82
Thanks: 18
Thanked 7 Times in 6 Posts
Quote:
Originally Posted by Tango Charlie View Post
Awesome link, cfg83!
That definitely answers my questions.
Now I'm wondering how to implement it on my Vibe...
I doubt it would do anything in a normal car at normal road speeds.If their was any thing beneficial to be had ,the car industry would implement it.I maybe wrong ?
  Reply With Quote
Old 01-24-2013, 08:44 PM   #37 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 27,561
Thanks: 7,736
Thanked 8,554 Times in 7,041 Posts
Speed holes:


Advanced race car practice:


Engine heat:
  Reply With Quote
Old 03-04-2018, 10:09 AM   #38 (permalink)
Master EcoModder
 
kach22i's Avatar
 
Join Date: Jul 2011
Location: Ann Arbor, Michigan
Posts: 4,158
Thanks: 120
Thanked 2,790 Times in 1,959 Posts
UPDATE: 03/04/2018
We don't discuss race car aerodynamics very often, so I'm just updating this old thread.

Hey, this example below does have front wheel vents in the computer animation, we will wait and see if the final version has them.

Formula E
Formula E - Pelican Parts Technical BBS
Quote:
Next seasons new car shape

Futuristic cladding built around a conventional single seater chassis






__________________
George
Architect, Artist and Designer of Objects

1977 Porsche 911s Targa
1998 Chevy S-10 Pick-Up truck
1989 Scat II HP Hovercraft

Chin Spoiler:
http://forums.pelicanparts.com/off-t...effective.html

Rear Spoiler Pick Up Truck
http://forums.pelicanparts.com/off-t...xperiment.html

Roof Wing
http://ecomodder.com/forum/showthrea...1-a-19525.html
  Reply With Quote
The Following User Says Thank You to kach22i For This Useful Post:
freebeard (03-04-2018)
Old 03-04-2018, 01:37 PM   #39 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 27,561
Thanks: 7,736
Thanked 8,554 Times in 7,041 Posts
That conforms to my theory of making a free-standing front fender into a plow shape.

The V-tail rear wing is also interesting. Current best practice?
__________________
.
.
Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster

____________________
  Reply With Quote
Old 03-04-2018, 02:37 PM   #40 (permalink)
Moderator
 
Vman455's Avatar
 
Join Date: Feb 2012
Location: Urbana, IL
Posts: 1,935

Pope Pious the Prius - '13 Toyota Prius Two
Team Toyota
SUV
90 day: 51.62 mpg (US)

Tycho the Truck - '91 Toyota Pickup DLX 4WD
90 day: 22.22 mpg (US)
Thanks: 198
Thanked 1,797 Times in 937 Posts
Quote:
Originally Posted by red91sit View Post
Aero Warriors - The <I>Scoop</I> On The Scoops

This is the most comprehensive explanation of the superbird / daytona's fender vents. I also vaguely remember hearing that these vents were designed to help remove rubber build up on modern racing cars with their ultra soft rubber compounds.
This is an interesting article. If anyone else reads it, note that the author's speculation about the fender louvers on the (then-current) 1999 Viper (actually, they appeared in 1996 on the GTS and 1996.5 on the RT/10) is incorrect. The plastic wheel well liner above the tire is solid, and those louvers cannot vent wheel well pressure.



However, the prominent side vents were/are open to the engine bay and wheel wells; the back part of the wheel well liner there is a rubber flap (just visible in the photo above), which may have served to alleviate wheel well pressure.


__________________
UIUC Aerospace Engineering
www.amateuraerodynamics.com
  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
DIY: plastic rear wheel skirts (Geo Metro) MetroMPG DIY / How-to 57 06-12-2014 09:16 AM
Help with my aero mods: 1.8L 05 Auto Toyota Corolla blackjackel Aerodynamics 73 11-22-2011 09:55 PM
Rear wheel skirt / cover question pasadena_commut Aerodynamics 5 02-16-2009 04:50 AM
Suspension Dams on Production Cars Arminius Aerodynamics 19 08-13-2008 02:49 PM
Wheel wells awillard69 Aerodynamics 10 04-26-2008 05:06 PM



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