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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 07-20-2016, 11:34 AM   #11 (permalink)
EcoModding Apprentice
 
KrautBurner's Avatar
 
Join Date: Mar 2014
Location: SUNNY Sequim, Wa
Posts: 239

Cavalier of D00M - '05 Pontiac GTO LS2 T56
90 day: 23.2 mpg (US)

The New One - '10 Toyota Prius II
90 day: 51.55 mpg (US)

Chick Magnet - '91 Geo Metro 3cyl/5sp
90 day: 48.07 mpg (US)
Thanks: 79
Thanked 40 Times in 34 Posts
Quote:
Originally Posted by Frank Lee View Post
You want this Jeep to suddenly become aerodynamic AFTER you buy it?
wow,

you've always been helpful

__________________
2005 GTO 6.0 V8 (600hp)

1991 Geo Metro 1.0 3/5 base

2010 Prius II (replaced 2001 Tahoe 5.3 V8 April 2014)

1994 F-350 7.3 TurboDiesel (Rollin' Coal)
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 07-20-2016, 03:36 PM   #12 (permalink)
Not Doug
 
Xist's Avatar
 
Join Date: Jun 2012
Location: Show Low, AZ
Posts: 12,186

Chorizo - '00 Honda Civic HX, baby! :D
90 day: 35.35 mpg (US)

Mid-Life Crisis Fighter - '99 Honda Accord LX
90 day: 34.2 mpg (US)

Gramps - '04 Toyota Camry LE
90 day: 35.39 mpg (US)

Don't hit me bro - '05 Toyota Camry LE
90 day: 35.79 mpg (US)
Thanks: 7,217
Thanked 2,217 Times in 1,708 Posts
Congratulations, Kraut, you have the distinction of being the only Ecomodder I know to both bring a six year-old thread back from the dead and start a new thread on a discussion you could have found through searching.

Yes, I understand you did not know the name, and that sure can make searching difficult, but not impossible. Had you looked for "stick-on aero thingies" you could have found http://ecomodder.com/forum/showthrea...ils-23114.html.

You also could have sent an active user a private message.
  Reply With Quote
The Following User Says Thank You to Xist For This Useful Post:
mcrews (07-20-2016)
Old 07-20-2016, 06:13 PM   #13 (permalink)
Master EcoModder
 
mcrews's Avatar
 
Join Date: Oct 2009
Location: Texas
Posts: 3,523

The Q Sold - '02 Infiniti Q45 Sport
90 day: 23.08 mpg (US)

blackie - '14 nissan altima sv
Thanks: 2,203
Thanked 663 Times in 478 Posts
Quote:
Originally Posted by Frank Lee View Post
You want this Jeep to suddenly become aerodynamic AFTER you buy it?
actually, (ignoring the sarcasm) frank lee makes a good point.

You claim to have already done work on a couple of cars...


how could you possibly think that 'tabs on a red brick' would give you any truly measurable about of inproved mpg?

you would need a COMPREHENSIVE approach to get any possible gain.
__________________
MetroMPG: "Get the MPG gauge - it turns driving into a fuel & money saving game."

ECO MODS PERFORMED:
First: ScangaugeII
http://ecomodder.com/forum/showthrea...eii-23306.html

Second: Grille Block
http://ecomodder.com/forum/showthrea...e-10912-2.html

Third: Full underbelly pan
http://ecomodder.com/forum/showthrea...q45-11402.html

Fourth: rear skirts and 30.4mpg on trip!
http://ecomodder.com/forum/showthrea...tml#post247938
  Reply With Quote
Old 07-21-2016, 01:52 AM   #14 (permalink)
Engine-Off-Coast
 
Natalya's Avatar
 
Join Date: Apr 2016
Location: Atlanta
Posts: 561

Red 2000 Insight (2017 through 2019) - '00 Honda Insight 5MT
90 day: 64.72 mpg (US)

Red 2000 Lithium Insight (2020) - '00 Honda Insight LTO
90 day: 71.76 mpg (US)
Thanks: 223
Thanked 305 Times in 175 Posts
This thread is really old mcrews.
  Reply With Quote
Old 07-21-2016, 07:19 AM   #15 (permalink)
Master EcoModder
 
mcrews's Avatar
 
Join Date: Oct 2009
Location: Texas
Posts: 3,523

The Q Sold - '02 Infiniti Q45 Sport
90 day: 23.08 mpg (US)

blackie - '14 nissan altima sv
Thanks: 2,203
Thanked 663 Times in 478 Posts
Quote:
Originally Posted by Natalya View Post
This thread is really old mcrews.
Stalking much?
__________________
MetroMPG: "Get the MPG gauge - it turns driving into a fuel & money saving game."

ECO MODS PERFORMED:
First: ScangaugeII
http://ecomodder.com/forum/showthrea...eii-23306.html

Second: Grille Block
http://ecomodder.com/forum/showthrea...e-10912-2.html

Third: Full underbelly pan
http://ecomodder.com/forum/showthrea...q45-11402.html

Fourth: rear skirts and 30.4mpg on trip!
http://ecomodder.com/forum/showthrea...tml#post247938
  Reply With Quote
Old 07-21-2016, 08:09 AM   #16 (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
IIRC There was a lot of stupid discussion going on at that time where many thought it would be great if, say, they put a pickup box on a Corvette and put Corvette running gear under a pickup. If ya want an aerodynamic vehicle, buy one that at least has a fighting chance. No, something that looks like the broad side of a barn ain't it.
__________________


  Reply With Quote
Old 07-31-2016, 09:46 PM   #17 (permalink)
EcoModding Lurker
 
Join Date: Jul 2016
Location: Guatemala City
Posts: 27
Thanks: 6
Thanked 7 Times in 7 Posts
You can make your own (for testing purposes) with a bit of thin cardboard or plastic and masking tape...but it won't (probably) do much good on a Jeep Liberty. Vortex generators cause the air to spin and hug a sharper curve than smooth airflow can. However on a Liberty there is very little curve to hug, it simply chops off at the back. You might see half a MPG dif.

If you have ever seen air spinning off the end of an airplane wing you get the concept of tabs. Tabs are tiny airplane wing tips. By angling the tabs slightly, you create higher pressure on the forward side and lower on the opposite. Thus the air will spill over the edge and cause a spin. Of course one could buy tabs that have been tested to maximize the efficiency of the effect, but even home-made tabs set at about the right angle will have enough effect for testing purposes...without costing hundreds of $. If you read the material about mounting the tabs you will probably glean enough info to figure out how and where to mount them. You might even plagiarize the general shape, though the shape of most are designed for attractiveness, not for efficiency. A flat/square wing creates the best vortex, but a sculpted sharp fin shape sells better. They are also designed for safety. A sharp wing edge is best, but the manufactures don't want to be sued...go figure. Tabs are placed in opposite angles, one left, next one right. This, I think, helps the vortex to carry far behind the vehicle without colliding with it's neighbor. Placing tabs too close will probably still cause interference.

The AirTabs brand is a special V design that builds two tabs into one unit... so don't copy them. Just make simple wings.

This is something that someone here could/should test. What is the best home-made tab shapes and angles. It would have to be someone with a sloped back window and someone who has regular enough commutes to get accurate results. I say "someone" because I don't have a regular commute and I am stuck in a city with VERY slow traffic.

Flat back vehicles like trailers and RVs do benefit from one other feature of vortex generators. They cause a reduced wake which somehow chops up the knock around effects of side wind gusts and passing trucks. I haven't read the science of it, but my theory is that when an RV is knocked around on the road by a passing truck it is due to the wind's effect on the RVs following wake, not so much the air hitting the RV's side. When the wake is knocked to one side it causes the RV to be pulled in that direction...and we all know the power of the following wake. I think that air tabs either block the wind a bit, or break up it's pull on the vehicle.

Incidentally, the divots in a golf ball cause the same effect. The air passing over the back of the ball can hug the ball to a greater angle. I think you should try tabs before drilling divots in your car though.
  Reply With Quote
The Following User Says Thank You to Poodwaddle For This Useful Post:
freebeard (08-01-2016)
Old 08-01-2016, 07:45 PM   #18 (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
Quote:
Originally Posted by mcrews
Stalking much?
As for myself, I'm here because there is a dearth of new threads.

Poodwaddle -- That's the best thing to do with a zombie thread feed it braaiiins.

Quote:
This is something that someone here could/should test. What is the best home-made tab shapes and angles. It would have to be someone with a sloped back window and someone who has regular enough commutes to get accurate results.
Go all Mythbusters on it. Commuting may not be the best test environment. I like the idea of a long tow cable with a streamlined tow vehicle and a 'vehicle in tow' sign in the middle so people don't cut lanes into it. Then with a simple spring scale and a dashcam you could get data independent of the drivetrain completely.

Also tuft testing and titrating gas from a graduated cylinder.

  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Comparing Warm Air Intakes (WAI) & Cold Air Intakes (CAI) toomuch EcoModding Central 27 11-20-2022 04:24 PM
Honda IACV explained TomO Off-Topic Tech 16 12-21-2015 01:49 AM
The Mechanism Behind Flow Separation LostCause Aerodynamics 46 07-15-2010 07:38 AM
Grill block affected milleage mar5ka Aerodynamics 24 08-31-2008 10:17 AM
Moving air intake into the engine compartment? pasadena_commut Aerodynamics 5 07-25-2008 03:24 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