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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 12-31-2009, 02:23 AM   #11 (permalink)
EcoModding Lurker
 
Join Date: Oct 2009
Location: DFW
Posts: 87

The Truck - '06 Chevrolet Silverado Ext Cab 4x4
90 day: 18.5 mpg (US)
Thanks: 4
Thanked 33 Times in 15 Posts
One more:


Attached Thumbnails
Click image for larger version

Name:	p1010081.jpg
Views:	2136
Size:	82.7 KB
ID:	5242  
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 12-31-2009, 02:29 AM   #12 (permalink)
EcoModding Lurker
 
Join Date: Dec 2009
Location: Modesto, CA
Posts: 18
Thanks: 0
Thanked 1 Time in 1 Post
Looks good.
  Reply With Quote
Old 12-31-2009, 02:47 AM   #13 (permalink)
Moderate your Moderation.
 
Join Date: Nov 2008
Location: Troy, Pa.
Posts: 8,919

Pasta - '96 Volkswagen Passat TDi
90 day: 45.22 mpg (US)
Thanks: 1,369
Thanked 430 Times in 353 Posts
Be careful about it blocking the 3rd brake light.... that might cause a legal issue in some areas.

If you want to fill the gap, just use some auto body masking tape and black plastic for now. In fact, that could be a 2 minute addition to test if the gap is really hurting you at all!

How do you intend to test your design?
__________________
"ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"

  Reply With Quote
Old 12-31-2009, 02:37 PM   #14 (permalink)
EcoModding Lurker
 
Join Date: Oct 2009
Location: DFW
Posts: 87

The Truck - '06 Chevrolet Silverado Ext Cab 4x4
90 day: 18.5 mpg (US)
Thanks: 4
Thanked 33 Times in 15 Posts
Well - it was a terrible day to do any real testing but it was the only time I'll have for a while.

I warmed the truck up and drove back and forth on a 1.5 mile stretch of straight rural highway.

I ended up doing a B-A-B-A test. Each leg was 4 sets of out and back.

B: avg mpg 19.6
A: avg mpg 18.8
B: avg mpg 19.4
A: avg mpg 18.8

So it looks like a lackluster improvement of ~.7 mpg or ~4%

The ambient temp was 10* and there was a NW wind at 10-15 mph. The road was East to West.

So I don't think the test is really all that valuable. I'll be interested to see how my mileage looks over time.

I'll take some more pics and maybe you all can let me know if you see any areas that may need improvement. I was really hoping to get 10 - 20% improvement.

(EDIT: testing speed of 55 mph)
  Reply With Quote
The Following 4 Users Say Thank You to Fubeca For This Useful Post:
5speed5 (02-28-2010), Ferr3t (04-20-2011), HHOTDI (10-07-2011), MetroMPG (01-02-2010)
Old 12-31-2009, 02:58 PM   #15 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 11,224
Thanks: 17,991
Thanked 5,974 Times in 3,631 Posts
weather

Quote:
Originally Posted by Fubeca View Post
Well - it was a terrible day to do any real testing but it was the only time I'll have for a while.

I warmed the truck up and drove back and forth on a 1.5 mile stretch of straight rural highway.

I ended up doing a B-A-B-A test. Each leg was 4 sets of out and back.

B: avg mpg 19.6
A: avg mpg 18.8
B: avg mpg 19.4
A: avg mpg 18.8

So it looks like a lackluster improvement of ~.7 mpg or ~4%

The ambient temp was 10* and there was a NW wind at 10-15 mph. The road was East to West.

So I don't think the test is really all that valuable. I'll be interested to see how my mileage looks over time.

I'll take some more pics and maybe you all can let me know if you see any areas that may need improvement. I was really hoping to get 10 - 20% improvement.
I suspect that if you had immediately yanked the cover and did the same runs "naked",that you would not have seen your 17.58mpg baseline.
I've been looking back over the logbook on my truck and it will lose almost 9 % mpg between winter and summer.
I really think that 10-degree temp is slamming your numbers,that's why I posted the general temp/mpg chart.Your 19.6 might become a 21.364 mpg in August.
It takes 22-miles of continuous driving at 50-mph just to bring a vehicle up to it's equilibrium temperature for any given ambient condition.Any parking time between runs,even a stoplight can cost you in heat transfer.
I like your cap a lot.Please spend some time with it and see that,when things warm up again,she doesn't go even further between gas pumps.
I tore my hair out the winter of '05/06 hoping to see my bellypan show up on the radar.It wasn't until spring that the numbers emerged.
  Reply With Quote
The Following User Says Thank You to aerohead For This Useful Post:
HHOTDI (10-07-2011)
Old 12-31-2009, 07:20 PM   #16 (permalink)
EcoModding Lurker
 
Join Date: Oct 2009
Location: DFW
Posts: 87

The Truck - '06 Chevrolet Silverado Ext Cab 4x4
90 day: 18.5 mpg (US)
Thanks: 4
Thanked 33 Times in 15 Posts
The "B" numbers above are with the topper and the "A" numbers are without. I'm not concerned about the overall numbers, as the cold does really effect it. I was just hoping to see a little more differentiation between the numbers with the topper and the numbers without.

I'm happy to see any improvement though and it keeps the snow out of the bed
  Reply With Quote
Old 12-31-2009, 08:14 PM   #17 (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 659 Times in 474 Posts
WOWOW!!!!!!
The black is shrink plastic???
There is some really lite foam in the marketplace that would fill the gap and not scratch the cab or be attached to the cab.
  Reply With Quote
Old 12-31-2009, 09:00 PM   #18 (permalink)
EcoModding Lurker
 
Join Date: Oct 2009
Location: DFW
Posts: 87

The Truck - '06 Chevrolet Silverado Ext Cab 4x4
90 day: 18.5 mpg (US)
Thanks: 4
Thanked 33 Times in 15 Posts
It isn't really meant to be a shrink plastic - but it works. It is just standard construction film. The stuff they use around here to provide a vapor barrier between the insulation and the living space in a house.

I was looking for something cheap and easy to cover the topper with and thought about boat shrink wrap (the stuff they use to protect boats in the off-season). It was kind of hard to come by at cheap prices so I tested this stuff since it was made of basically the same plastic. I picked it up at the local hardware store in a big roll.

Up close you can see a lot of imperfections - but it looks great from a distance and it was cheap and easy. I just wrapped the whole thing, stapled it to the underside and shrunk it up with my heat gun.

I'll try and pull another picture off my camera tonight that shows it a little better.
  Reply With Quote
Old 12-31-2009, 09:10 PM   #19 (permalink)
EcoModding Lurker
 
Join Date: Oct 2009
Location: DFW
Posts: 87

The Truck - '06 Chevrolet Silverado Ext Cab 4x4
90 day: 18.5 mpg (US)
Thanks: 4
Thanked 33 Times in 15 Posts
It is hard to get the images to show detail - the snow/light kind of washes it out.

Attached Thumbnails
Click image for larger version

Name:	p1010084.jpg
Views:	2194
Size:	51.4 KB
ID:	5248  
  Reply With Quote
The Following User Says Thank You to Fubeca For This Useful Post:
HHOTDI (10-07-2011)
Old 12-31-2009, 10:38 PM   #20 (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 659 Times in 474 Posts
very impressive...... very clean.......

Maybe Darrin should think about this stuff for his bumble bee tail......

  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Ben Nelson's Electro-Metro Build thread bennelson Fossil Fuel Free 1499 12-22-2019 07:24 PM
The Little Red Build Thread Oval_Overload EcoModding Central 37 09-30-2010 06:19 PM
Build Thread Key Postings Index Experiment. TestDrive Forum News & Feedback 7 02-15-2009 08:53 PM
aerocap or tonneau? (build thread?) ModelE Aerodynamics 9 01-04-2009 09:36 PM
The UnNamed Wagon's build thread - Let it begin! Work in Progress XFi EcoModding Central 38 08-01-2008 12:21 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