Go Back   EcoModder Forum > Introductions
Register Now
 Register Now

Reply  Post New Thread
Submit Tools LinkBack Thread Tools
Old 10-13-2008, 11:26 AM   #1 (permalink)
EcoModding Lurker
Join Date: Aug 2008
Location: boston ma.
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
economy for my gmc's toolboxes

Hi to everyone, I hope your vehicles are getting good milage. I've been wondering about making up and putting a couple of aluminum (maybe plastic or thin fiberglass) contoured air dams around the square fronts of my weatherguard side mount toolboxes. I mean the big flat areas can't help the airflow, right? Should I consider the rear of the toolboxes also, probably. Has anyone here done something like this? Do they sell them premade anywhere?

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

Old 10-13-2008, 12:13 PM   #2 (permalink)
Daox's Avatar
Join Date: Dec 2007
Location: Germantown, WI
Posts: 11,126

CM400E - '81 Honda CM400E
90 day: 51.49 mpg (US)

Daox's Grey Prius - '04 Toyota Prius
Team Toyota
90 day: 49.53 mpg (US)

Daox's Insight - '00 Honda Insight
90 day: 64.33 mpg (US)

Swarthy - '14 Mitsubishi Mirage DE
90 day: 56.69 mpg (US)
Thanks: 2,443
Thanked 2,490 Times in 1,502 Posts
Hello and welcome to the site.

Do you think you could get pictures that represent your problem and/or what you are thinking about doing?
Current project: A better alternator delete
  Reply With Quote
Old 10-13-2008, 12:31 PM   #3 (permalink)
Batman Junior
MetroMPG's Avatar
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 21,710

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 53.56 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 66.29 mpg (US)
Thanks: 3,442
Thanked 6,264 Times in 3,238 Posts
Something like this?

Latest mods: 3-cylinder Mitsubishi Mirage. EcoMods now in progress...
Ecodriving test:
Manual vs. automatic transmission MPG showdown

has launched a forum for the efficient new Mitsubishi Mirage
www.MetroMPG.com - fuel efficiency info for Geo Metro owners
www.ForkenSwift.com - electric car conversion on a beer budget
  Reply With Quote
Old 10-25-2008, 09:01 AM   #4 (permalink)
EcoModding Lurker
Join Date: Aug 2008
Location: boston ma.
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts

My boxes kind of stickout more and I have this (lightweight) aluminum ladder rack. I'll try to post pics later, going to work now.
  Reply With Quote
Old 10-29-2008, 07:29 PM   #5 (permalink)
EcoModding Lurker
Join Date: Aug 2008
Location: boston ma.
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
air dam for toolbox

can you see these pictures good enough? any thoughts?
Attached Thumbnails
Click image for larger version

Name:	1138.jpg
Views:	33
Size:	29.5 KB
ID:	2022   Click image for larger version

Name:	1146.jpg
Views:	21
Size:	28.0 KB
ID:	2023  
  Reply With Quote
Old 10-29-2008, 08:21 PM   #6 (permalink)
Master EcoModder
gascort's Avatar
Join Date: Jun 2008
Location: Saint Louis, MO
Posts: 548

Gascort RIP - '93 Ford Escort Wagon
90 day: 43.01 mpg (US)

WifesCruze - '11 Chevrolet Cruze LT
90 day: 31.1 mpg (US)
Thanks: 14
Thanked 24 Times in 16 Posts
couldn't hurt. I like your idea in the picture, but I think you'd be better off if you could get it to come all the way to the cab - probably lots of air running right against the window that you could smoothen out, plus if you don't get all the way against it, your air deflector could act as a parachute and hurt drag, or worse, rip off!
Welcome to ecomodder!
Any other mods planned?
Gasoline, Wind, Solar, Gravity Hybrid-to-be! http://www.scientificmethodfueleconomy.blogspot.com/
  Reply With Quote
Old 10-30-2008, 07:30 AM   #7 (permalink)
EcoModding Lurker
Join Date: Aug 2008
Location: boston ma.
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts

yeah that's an interesting thot maybe between the boxes and cab might do more. I was going kinda for what was looking good and smoothing the airflow.
let me think. oh and I am considering the tire cover smoothing and underneath smoothing. Try to help reduce airflow turbulence some.

Last edited by jen6238; 10-30-2008 at 07:34 AM.. Reason: answer question
  Reply With Quote
Old 04-11-2009, 11:58 AM   #8 (permalink)
EcoModding Lurker
Join Date: Aug 2008
Location: boston ma.
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
gmc toolbox mod

pix of my mod. I know it's not much but that bothered me every time i looked in the side mirror. A big flat windbreak stealin' gas!!!!! Grrrrr. Anyway this is what i did and it is creating conversation about mileage. Most of the comments are positive. I walk and ride my bicycle (an old racer) when i'm not working so i make up for my gmc just a little......
Attached Thumbnails
Click image for larger version

Name:	airfoil left 1 .JPG
Views:	20
Size:	97.0 KB
ID:	3208   Click image for larger version

Name:	airfoil right 2.JPG
Views:	19
Size:	124.2 KB
ID:	3209  
  Reply With Quote
Old 04-11-2009, 04:24 PM   #9 (permalink)
EcoModding Lurker
Join Date: Apr 2009
Location: usa
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
Not sure that's gonna help much, I would guess you create a vast amount of turbulence between the cab and the box. I have the EXACT same setup on my F150.

If you want to really improve the flow you need to create a transition fairing from the cab to the rear like on the big rigs. It should attach to the cab and taper to the rear. If you don't want to drill into the cab, mount it to your boxes and use foam to filled the gap to the cab.

Not rigid foam, flexible foam, like you use to install window A/C units. They used to sell foam pieces to go between caps and cabs back in the day. I dunno if they still sell them. The cab and bed of your pickup flex at different rates so the link can't be rigid.

I think the diamond plate finish may actually improve the flow of air over the boxes. I recall the "sharkskin" swim suits from a few years ago that weren't smooth. The ridges created a laminar flow with less drag than a smooth suit.

Last edited by stanz; 04-11-2009 at 04:28 PM.. Reason: more stuff to say!
  Reply With Quote
Old 04-11-2009, 05:05 PM   #10 (permalink)
Ecomod noob
zjrog's Avatar
Join Date: Feb 2008
Location: Tooele, UT
Posts: 412

ZJ - '95 Jeep Grand Cherokee Laredo Upcountry
90 day: 20.57 mpg (US)

Neon - '03 Dodge Neon SE
90 day: 33.46 mpg (US)

S'Crew - '02 Ford F150 Supercrew XLT
90 day: 16.4 mpg (US)

Ranger - '90 Ford Ranger
Last 3: 28.02 mpg (US)

Not the Jeep - '03 Dodge Neon SE
90 day: 34.11 mpg (US)
Thanks: 7
Thanked 15 Times in 10 Posts
Not that its any help, for my worktruck, I've tried all manner of adjusting me, the driver. I drive a 2008 Dodge 3500 4 door 1 ton service body truck with duals, and it is loaded with equipment and tools and parts, and often an ATV with fuel in the bed. I've seen a low of 10.5 MPG, but can never get it above 12.3. And its not mine to mess with but I wonder how some sort of fairings on the sides to blend flow from cab to box would improve mileage. Now granted, this isn't a highway truck (well, not much) and it spends a lot of time at 45 MPH and under in the desert. But even on the highway, 12.3 isn't great.

I'm really curious to see what sort of ideas the collective can come up with for you.

When it comes to Heroes, RENEGADES are mine!
  Reply With Quote
Reply  Post New Thread

Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
Fuel Economy related papers tasdrouille General Efficiency Discussion 38 09-10-2017 12:48 AM
What 0-60 acceleration would you accept for good fuel economy? MetroMPG General Efficiency Discussion 63 10-06-2008 11:16 PM
2008 World Fuel Economy Championships - Scores Dan. General Efficiency Discussion 24 06-23-2008 09:50 AM
The New York Times: Economy Champs Get the Cold Shoulder akcapeco EcoModding Central 4 06-14-2008 12:42 AM
Basic EcoDriving Techniques and Instrumentation SVOboy Instrumentation 2 11-17-2007 11:38 AM

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com