TeamSwift

Home of the Suzuki mini-compacts ! Your Home for all things Suzuki Swift, Geo Metro, Holden Barina, Chevy Sprint, Pontiac Firefly, and Suzuki Cultus. TeamSwift is a technical performance oriented community!
It is currently Sun Oct 22, 2017 5:57 am

Underbody braces, turbos and more!

All times are UTC - 5 hours




Post new topic Reply to topic  [ 18 posts ] 
Author Message
 Post subject: My Airtabs test results
PostPosted: Fri Feb 06, 2009 6:31 am 
Offline
User avatar

Joined: Tue Apr 08, 2008 9:08 pm
Posts: 1254
Location: Ashtabula, Ohio
I recently installed some Airtabs (Vortex Generators) to the rear hatch of my Metro. After 4 tanks of fuel, I did not see any increase in my fuel economy. These were basically designed for large vehicles like buses, RV's, and tractor/trailer combos......................

Image

Image

I do have one positive comment about installing these on the back of my car. They keep the rear window clean! Has anyone else tried using these on their vehicles? More info on the Airtab can be found on their official website........
http://www.airtab.com

_________________
Image
  • EcoMudder - Geo Metro Mudder
  • Project page
  • Build Video
  • 1991 4 Door Truck Conversion
  • Modified Suzuki 1.0L Engine
  • High Stall 3200 RPM Converter
  • Auto Trans with Welded Differential
  • Custom Exhaust and Intake System
  • 6" Suspension Lift & Weight Reduction
  • 27" Kenda Executioner 6 Ply ATV tires


Top
 Profile  
 
PostPosted: Mon Feb 09, 2009 12:07 am 
Offline

Joined: Sun May 25, 2008 11:26 pm
Posts: 70
Location: Port Orchard, Washington USA
Johnny,

How much highway driving do you do?

I was about to ask if these tabs cleaned up the air on the back of the car when I saw your second comment.

Any thoughts about fitting some on the bottom of the rear bumper?

Thanks

Trevor


Top
 Profile  
 
PostPosted: Mon Feb 09, 2009 6:46 am 
Offline
User avatar

Joined: Tue Apr 08, 2008 9:08 pm
Posts: 1254
Location: Ashtabula, Ohio
I do almost no highway driving. All my driving is mostly 55MPH country roads. I am not sure what putting the tabs on the lower part of the car would do.

_________________
Image
  • EcoMudder - Geo Metro Mudder
  • Project page
  • Build Video
  • 1991 4 Door Truck Conversion
  • Modified Suzuki 1.0L Engine
  • High Stall 3200 RPM Converter
  • Auto Trans with Welded Differential
  • Custom Exhaust and Intake System
  • 6" Suspension Lift & Weight Reduction
  • 27" Kenda Executioner 6 Ply ATV tires


Top
 Profile  
 
PostPosted: Mon Feb 09, 2009 8:28 am 
Offline
User avatar

Joined: Tue Apr 29, 2008 8:06 pm
Posts: 1445
Location: Atlanta GA 30052
JohnnyMullet wrote:
I am not sure what putting the tabs on the lower part of the car would do.

keep the car straight in water? :lol:

keep on trying JohnnyTheExperimenterMullet. :yeahyeah :salute:

_________________
looking for:
the time i mispent in my youth

daily driver: red 1991 Metro 3cyl 5sp, roof rack, 8 degree advance,
got 61 mpg combined on 14" tires but i prefer 12"

completed frame up restoration: black 1994 Swift GT 5sp -- like new ! 45mpg


Top
 Profile  
 
PostPosted: Mon Feb 09, 2009 8:35 pm 
Offline

Joined: Sun May 25, 2008 11:26 pm
Posts: 70
Location: Port Orchard, Washington USA
"keep the car straight in water?"

Yeh Yeh smart ass

Have to ever looked at the lower rear of an F1 car or, a Toyota Prius for that matter?

What you see is called a diffuser

TH


Top
 Profile  
 
PostPosted: Mon Feb 09, 2009 9:01 pm 
Offline

Joined: Thu Jul 10, 2008 9:08 am
Posts: 41
Location: Florida
Ideally you'd put them all the way around the back- top, bottom and both sides. Sides are probably more important since the car is wider than it is tall, but they would also look the worst.

_________________
1991 Geo Metro 2dr HB 1.0 Auto


Top
 Profile  
 
PostPosted: Mon Feb 09, 2009 9:59 pm 
Offline
User avatar

Joined: Tue Apr 08, 2008 9:08 pm
Posts: 1254
Location: Ashtabula, Ohio
I'm just glad the rear window stays clean :D

_________________
Image
  • EcoMudder - Geo Metro Mudder
  • Project page
  • Build Video
  • 1991 4 Door Truck Conversion
  • Modified Suzuki 1.0L Engine
  • High Stall 3200 RPM Converter
  • Auto Trans with Welded Differential
  • Custom Exhaust and Intake System
  • 6" Suspension Lift & Weight Reduction
  • 27" Kenda Executioner 6 Ply ATV tires


Top
 Profile  
 
PostPosted: Tue Feb 10, 2009 10:13 pm 
Offline

Joined: Sun Aug 20, 2006 11:31 pm
Posts: 57
Location: Lummi Island
Hmmm,
I have a friend who designed and patented something similar,(and certainly infringing) about 10 years ago.
You can make your own from the poly carb. corner protectors sold at home desperate to protect wall papared
corners. I have some on my F-100 truck on the front hood curve and the initial curve of the roof.
I picked up about 1mpg. at 70mph.
You make them by cutting off 2" sections of the plastic angle material and then cut the front vertical edge back at a 45degree angle so it forms an angled fin when set on a table. You then attach by using double sided stick foam tape
on the bottom surface.
You put them along the mid section of the hood or roof curve fanning outward at about 30 deg. from the centerline.
I will take a picture of the ones on my truck.
I think a deflector wing like the old station wagons used would be more effective on the rear of
the geo, but the VG's should have some effect.
Incidently, the home made VG's are exactly like the ones found on commercial aircraft and the shape
is probably more effective than these tabs, but the shape is more prone to hurting someone if they fly over your hood...

MM


Top
 Profile  
 
PostPosted: Sat Feb 14, 2009 2:45 pm 
Offline
User avatar

Joined: Mon Mar 21, 2005 4:52 pm
Posts: 634
Location: Eastern Ontario
I got the same results Mullet did after A-B-A testing the same vortex generators on two different vehicles. No improvement in fuel economy.

Tests were done on a 2006 Toyota Corolla 4 door sedan, and a 2005 Pontiac Montana minivan (most like the Metro's shape & Cd).

Image

Image

They will help keep a rear window cleaner though - tuft testing showed that.

No, the only thing I know of that you can stick on the back of a Metro and actually reduce fuel consumption is a partial Kammback. (Or a full boat tail, if you're feeling adventurous!)

EG:

Image
(details)

_________________
Image
www.MetroMPG.com ... www.ForkenSwift.com
... www.EcoModder.com


Top
 Profile  
 
PostPosted: Sat Feb 14, 2009 8:15 pm 
Offline
User avatar

Joined: Wed Sep 15, 2004 3:58 pm
Posts: 246
Location: The Arctic
forgive me for sounding developmentally delayed, but I was looking at a few pics of cars with factory installed vortex generators (such as the EVO MR) and noticed that they have the pointy end aimed forward where you have yours aimed the opposite way.

Just a thought.

_________________
1993 GEO METRO 1.0 lsi (xfi swap)
1995 Eddie Bauer Exploder
1983 CHEVY C-10--the gas guzzler
1997 VW GTI VR6 Turbo--dead as a door nail
1994 GEO METRO 1.0 xfi (retired and parted out)
1989 Suzuki Swift GTi (sold)


Top
 Profile  
 
PostPosted: Sat Feb 14, 2009 8:18 pm 
Offline
User avatar

Joined: Wed Sep 15, 2004 3:58 pm
Posts: 246
Location: The Arctic
3play wrote:


Incidently, the home made VG's are exactly like the ones found on commercial aircraft and the shape
is probably more effective than these tabs, but the shape is more prone to hurting someone if they fly over your hood...

MM


LMAO :rollin:

_________________
1993 GEO METRO 1.0 lsi (xfi swap)
1995 Eddie Bauer Exploder
1983 CHEVY C-10--the gas guzzler
1997 VW GTI VR6 Turbo--dead as a door nail
1994 GEO METRO 1.0 xfi (retired and parted out)
1989 Suzuki Swift GTi (sold)


Top
 Profile  
 
PostPosted: Sat Feb 14, 2009 8:36 pm 
Offline

Joined: Mon Jun 09, 2008 9:01 am
Posts: 116
Location: california
I also have seen then on some vehicles and yes the pointed end is foward and as they get toward the end of the vehicle the angle changes from straight foward to flared to the outside....


Top
 Profile  
 
PostPosted: Sat Feb 14, 2009 11:45 pm 
Offline
User avatar

Joined: Mon Mar 21, 2005 4:52 pm
Posts: 634
Location: Eastern Ontario
OEM Evo VG's:

(Sorry for it being a gigantic pic)

Image

Pointy end looks more toward the rear to me.

_________________
Image
www.MetroMPG.com ... www.ForkenSwift.com
... www.EcoModder.com


Top
 Profile  
 
PostPosted: Sun Feb 15, 2009 12:02 am 
Offline
User avatar

Joined: Wed Sep 15, 2004 3:58 pm
Posts: 246
Location: The Arctic
I wonder what a difference it would make to turn JohnnyMullet's air tabs around

_________________
1993 GEO METRO 1.0 lsi (xfi swap)
1995 Eddie Bauer Exploder
1983 CHEVY C-10--the gas guzzler
1997 VW GTI VR6 Turbo--dead as a door nail
1994 GEO METRO 1.0 xfi (retired and parted out)
1989 Suzuki Swift GTi (sold)


Top
 Profile  
 
PostPosted: Mon Feb 16, 2009 9:46 am 
Offline
User avatar

Joined: Mon Mar 21, 2005 4:52 pm
Posts: 634
Location: Eastern Ontario
They're installed following the manufacturer's instructions.

VG's are no magic bullet, yet they seem to get a disproportionate amount of attention.

Real gains are to be found elsewhere.

_________________
Image
www.MetroMPG.com ... www.ForkenSwift.com
... www.EcoModder.com


Top
 Profile  
 
PostPosted: Mon Feb 16, 2009 1:01 pm 
Offline
User avatar

Joined: Wed Aug 20, 2008 11:54 pm
Posts: 225
Location: San Jose CA USA
You can download a Mitsu engineering white paper discussing the Evo factory VG's to discover that all they were tryng to accomplish was to bend the overall airflow hardly one inch to get better down force on the factory rear spoiler for running at 150 mph. They got some tiny amount of increased downforce like .01 whatthefuckevers that was just enough to stabilize the ass end at top speed only. And this little privelage cost the buying public $1000 USD, but really makes the speedbump to speedbump shopping mall ricers "feel fast".

The airtabs Mullet used are for 18 wheelers and are supposed to be installed "backwards" and the windtunnel smoke testing shows a shocking amount of smoothing out of exiting airflow off the rear of large box shaped objects (as in tractor TRAILER or Winnebago). It's a lot easier for long haul truckers to quantitatively determine a 4% increase in gas mileage and save a couple grand a year doing it. I could buy a couple geos for that kind of money....

I'm gonna stick the airtabs on every car & SUV I own just to keep the back windows clean. I may even experiment with displacing airflow around front truck mirrors to see if I can't get the whooshing noise to go away.

Rock On Mullet Man!

1990 Suburban 1500 5.3
2006 Trailblazer SS LS2
1965 Corvair Corsa 4-5-6 (4 whl disc, 5 speeds, 6 injectors)
1997 "Geo Cultus" MPFI going on this week, dogs....

_________________
95 Metro hatch "Tequila lime" all stock
F/S 3Tech economy cam
F/S 90 Metro hatch
F/S 89 Swift GTi body only
F/S 92 Tracker 2 dr rwd stock
93 Sidekick 4 dr 1.9 vw TD, WVO conversion, 6" lift over 33's


Top
 Profile  
 
PostPosted: Mon Feb 16, 2009 2:35 pm 
Offline
User avatar

Joined: Tue Apr 29, 2008 8:06 pm
Posts: 1445
Location: Atlanta GA 30052
bmg_customz wrote:
I wonder what a difference it would make to turn JohnnyMullet's air tabs around

well you can go over after dark and try. :lol:

Where can we buy these Klingon Nipples? :alien:

_________________
looking for:
the time i mispent in my youth

daily driver: red 1991 Metro 3cyl 5sp, roof rack, 8 degree advance,
got 61 mpg combined on 14" tires but i prefer 12"

completed frame up restoration: black 1994 Swift GT 5sp -- like new ! 45mpg


Top
 Profile  
 
PostPosted: Tue Feb 17, 2009 12:24 am 
Offline
User avatar

Joined: Wed Sep 15, 2004 3:58 pm
Posts: 246
Location: The Arctic
xrw44 wrote:
bmg_customz wrote:
I wonder what a difference it would make to turn JohnnyMullet's air tabs around

well you can go over after dark and try. :lol:

Where can we buy these Klingon Nipples? :alien:


Long drive from Alaska.... then again I haven't been through Ashtabula County in a few years!!

_________________
1993 GEO METRO 1.0 lsi (xfi swap)
1995 Eddie Bauer Exploder
1983 CHEVY C-10--the gas guzzler
1997 VW GTI VR6 Turbo--dead as a door nail
1994 GEO METRO 1.0 xfi (retired and parted out)
1989 Suzuki Swift GTi (sold)


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 18 posts ] 

All times are UTC - 5 hours


Who is online

Users browsing this forum: No registered users and 4 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group