Help me get better then 6 mpg please. - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Reply
 
Thread Tools Display Modes
 
Old 05-30-2009, 05:37 PM   #1
Registered Member
 
GasSavers_mikemoss's Avatar
 
Join Date: Jan 2009
Posts: 42
Country: United States
Help me get better then 6 mpg please.

I recently started a new job that involves us driving all over the country. The catch is that the truck and trailer that the company gave us were never meant to be used together.

We have a 2005 Ford f150 lariat like this

http://www.classyauto.com/image342622.img

and a trailer roughly like this

http://www.mtairygolf.com/14%20foot%...h%20lights.JPG

Our trailer might be a little longer but basically like that. Im not sure how much it weighs but I would guess somewhere in the 7000lb range. The truck now cant pull it in overdrive and we are averaging between 6 and 8 mpg depending on the road.

What are the best areo mods we could do to the 2 things in order to increase economy? We cant do much to the truck now bc it is still under warrantee.


Thanks for any help.

Michael
__________________

__________________
GasSavers_mikemoss is offline   Reply With Quote
Old 05-30-2009, 06:07 PM   #2
Registered Member
 
theholycow's Avatar
 
Join Date: Apr 2008
Posts: 6,624
Country: United States
Send a message via ICQ to theholycow Send a message via AIM to theholycow Send a message via MSN to theholycow Send a message via Yahoo to theholycow
You can boattail the trailer, or just edge it (if that's the way to describe it). My sig meta thread has a link to a PDF at NASA's website where they tested aerodynamic mods for big tractor trailer boxes, and found that an edge hanging off the back helps.

Edit: Here's the links:
http://www.nasa.gov/centers/dryden/p...ain_H-2283.pdf
http://permanent.access.gpo.gov/webs...00-01-2209.pdf
http://www.greencarcongress.com/2005...at_tail_d.html
__________________

__________________
This sig may return, some day.
theholycow is offline   Reply With Quote
Old 05-30-2009, 06:26 PM   #3
Registered Member
 
GasSavers_mikemoss's Avatar
 
Join Date: Jan 2009
Posts: 42
Country: United States
Cool thanks. Ill have to read that soon. Dont think we can boattail bc there are doors on the back. But a hangover thing on the back could be possible.

I have read that vortex generators may or may not help mileage but will they always help stability? And would they be effective on the trailer since it is just square at the back? This trailer catches the wind like a sail and the truck doesnt weigh enough to keep it strait, same happens when trucks pass.

Thanks
__________________
GasSavers_mikemoss is offline   Reply With Quote
Old 05-30-2009, 06:32 PM   #4
Registered Member
 
JanGeo's Avatar
 
Join Date: Jan 2006
Posts: 2,442
Country: United States
Send a message via Yahoo to JanGeo
Sounds like you need to put a cap on the back of the truck to help the air flow and transfer some weight to the truck bed as well. The air tabs probably would help the trailer since that is exactally what they are designed to do.
JanGeo is offline   Reply With Quote
Old 05-30-2009, 06:39 PM   #5
Registered Member
 
GasSavers_mikemoss's Avatar
 
Join Date: Jan 2009
Posts: 42
Country: United States
The bed has a tauno cover. The things we would do wouldnt be funded by the company, most likely, so for now I would like simple cheap ideas. I have thought about a partial grill block but I think we need to get all the heat out of the engine/tranny as possible.

How much would putting wheel skirts on the trailor help?
__________________
GasSavers_mikemoss is offline   Reply With Quote
Old 05-30-2009, 06:52 PM   #6
Site Team / Moderator
 
Jay2TheRescue's Avatar
 
Join Date: Sep 2008
Location: Northern Virginia
Posts: 4,657
Country: United States
Location: Northern Virginia
I think a Kammbak (sp?) on the trailer will be the best aero mod to do.
__________________






Jay2TheRescue is offline   Reply With Quote
Old 05-30-2009, 07:47 PM   #7
Registered Member
 
theholycow's Avatar
 
Join Date: Apr 2008
Posts: 6,624
Country: United States
Send a message via ICQ to theholycow Send a message via AIM to theholycow Send a message via MSN to theholycow Send a message via Yahoo to theholycow
Whatever you do, make absolutely sure the transmission can get as much cooling as possible. There's nothing tougher on an automatic transmission than towing (well, maybe snowplowing), and no part more vulnerable to towing damage than the transmission. Increased cooling and frequent transmission fluid changes are what makes an automatic transmission survive difficulty.
__________________
This sig may return, some day.
theholycow is offline   Reply With Quote
Old 05-30-2009, 07:53 PM   #8
Registered Member
 
theclencher's Avatar
 
Join Date: Aug 2006
Posts: 542
Country: United States
I doubt if a grille block is a good idea when pulling. The minute aero improvement is less important than preventing overheating.

Airtabs are also a minute improvement at best.

Skirts are a minute improvement too. But if you have some free coroplast or other appropriate materials lying around and can make some that don't look clownish, might as well. I wouldn't do the truck though.

The cap is by far the best idea, along with xfering some weight to the truck. It's "tonneau" cover BTW.

Second best might be partial kamm back on the trailer, a.k.a. "Clarkson device" as in holycow's last link. They didn't invent that though, so I'd hesitate to name it after them.

A deeper airdam might help some.

It's going to have awful aero no matter what you do unless you get radical and you can't really do that on someone else's rig. So then what? Keep it under 55 mph. I've found that when doing heavy pulling with my F150, 50-54 mph seems to be optimal. It's a sweet spot, juuuuuust fast enough to get overdrive (if there's no uphill or headwind) and juuuuuust slow enough to keep it from downshifting for every little thing.

6 mpg?!? I can't freekin' believe that. My F150 is a '94 with the 5.0, and even when doing the aforementioned heavy pulling it gets about 12 mpg.
__________________
Tempo/Topaz:
Old EPA 23/33/27
New EPA 21/30/24

F150:
New EPA12/14/17

theclencher is offline   Reply With Quote
Old 05-30-2009, 09:11 PM   #9
DRW
Registered Member
 
Join Date: Oct 2006
Posts: 615
Country: United States
Don't forget the basics like tire pressure. I'm not recomending raising the tire pressure too high, maybe just 5 psi above recomended pressure. I'd also check the wheelbearings to make sure they rotate smoothly.

Don't forget your driving habits. Keep the throttle steady, use cruise control when possible. Try to avoid flooring the throttle and avoid hard braking. If you look ahead and anticipate changing traffic conditions you should be able to get on and off the gas and brake sooner, which saves gas.
__________________
Dave W.
DRW is offline   Reply With Quote
Old 05-30-2009, 09:43 PM   #10
Registered Member
 
GasSavers_bobski's Avatar
 
Join Date: May 2007
Posts: 463
Country: United States
Quote:
Originally Posted by mikemoss View Post
How much would putting wheel skirts on the trailor help?
Lipstick on a pig. From the pics, it looks like half of that trailer is sticking up in the wind, aerodynamic brick style. You need to smooth out the front of the trailer or bridge the gap between the truck cab and front of the trailer with a cap as JanGeo suggested.
__________________

GasSavers_bobski is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Not very precise mpg calculation larjerr Fuelly Web Support and Community News 4 08-20-2012 02:03 AM
Keeping my distance in traffic khurt General Fuel Topics 8 09-07-2008 04:23 AM
When filling up today to check my mileage I had an issue. HondaTorneoSiR Experiments, Modifications and DIY 2 06-12-2008 07:28 AM
Electrical power and cars. DracoFelis Automotive News, Articles and Products 2 09-16-2006 02:31 PM
Honda TPS Sensors - $15/ea Matt Timion For Sale 7 06-27-2006 12:05 PM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 09:01 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.