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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 05-13-2014, 12:28 PM   #1 (permalink)
is not covered in bees.
 
Istas's Avatar
 
Join Date: May 2009
Location: Seeley Lake, Montana, USA
Posts: 202

Honda - '05 Honda Accord EX
90 day: 32.86 mpg (US)
Thanks: 51
Thanked 42 Times in 21 Posts
Send a message via AIM to Istas
Accord aero mods, 4.25% increase, more to come

Starting point: 2005 Honda Accord EX sedan 2.4L 4-cylinder 5-speed automatic.

Mods tested:
- full upper grill block
- partial lower grill block
- panel closing the gap between the intake and bottom of radiator housing
- airdam (extending as low as lowest point on vehicle)
- partial undertray (20 inches / 50cm back from nose, doesn't quite reach wheels)
- mirrors folded back

Untested mods:
- rear wheel skirts
- smooth wheel covers
- larger OD tires
- sealed gaps around headlights/front panels (silicone) and hood (foam insulation strips)
- deleted mirrors

Total intake area of 54 square inches / 350 square centimeters, but I hadn't sealed the edges of the blocks yet.

Pic as tested:


A-B-A-B tested at 55mph / 88km/h, sunny and dry, temp 51F to 57F (~10-14C) during testing, winds somewhat gusty, sustained from 0 to 6 mph (10km/h). Test section 1.6 miles/2.5km long, straight, somewhat level. Longer and more level would have been better but there are limited nearby options living in the mountains of rural western Montana.
It's a 15 mile drive for me to get to the test site, and on top of that I did a couple warm-up runs while picking out turn-around points before gathering data, so the car should have been as warmed up as it could get.
I finally have cruise control! Set once at 55mph and left for the duration of the testing, engine never turned off.
24 passes, with half heading east and half heading west. 4 passes stock, 8 passes mods, 8 passes stock, 4 passes mods. Was only overtaken twice, and since it was once with mods and once stock, and I was going so much slower than the passers, and the numbers didn't stand out as odd, I left them in.

Results: 43.2, 45.2, 43.4, 45.2 mpg, for a 4.27% increase. Coolant temp rose less than 1F average, 2F at most (may change in summer).

Given the peculiar driving profiles while testing (measuring only a single, not quite level stretch of highway over and over) I'm not sure that this is an indicator of overall fuel economy, but with A-B-A-B testing, 24 passes, and pretty consistent figures, I'm confident the improvement figure is valid.

Original data for any interested: https://docs.google.com/spreadsheets...it?usp=sharing

Pic of Accord as currently modded:


Stock picture, for reference:


Please let me know if the above pictures don't load; photobucket has been iffy on direct-linking images, it seems.

Some pics of fabrication and detail shots of the structure can be seen in this album (linking the album to not clutter the post with images). Honda Photos by IstasPuma | Photobucket

Construction material details: Total added mass from the mods is less than 8 pounds / 4kg.
Materials used are:
- galvanized sheet steel (do not remember the gauge, but it was sold as roof flashing)
- slotted hex washer head sheet metal screws, size 8x3/4 (take a 1/4" socket, or flat-head screwdriver)
- 3/16" outer diameter pop rivets (for permanent connections, such as the front undertray to the airdam, and the supporting bar for the undertray)
- 1/4"x3/4" flat aluminum bar (for supporting the upper edge of the upper grill block, as well as lower edge of future rear wheel skirts)
- aluminum L-bar (I forget the dimensions, but for supporting sheet metal across the width of a car I'd recommend the height be at least 3/4")
- >=1" outer diameter foam pipe insulation (for rounding transition from airdam to undertray without complex metalworking)
- Gorilla glue (for attaching pipe insulation)
- 3/16"x3/4" tight-fit open cell foam tape (for sealing the edges of the grill blocks)
- regular hubcaps plus 17" aluminum pizza pans

Planned mods:
- full undertray

Possible mods:
- warm-air intake (possibly adjustable)
- wheel spats/boattails
- air deflector for wipers
- maaaaaaaaybe kammback


Last edited by Istas; 04-21-2016 at 04:16 AM.. Reason: updated recent mod pic
  Reply With Quote
The Following 11 Users Say Thank You to Istas For This Useful Post:
101Volts (05-24-2014), aerohead (05-17-2014), California98Civic (07-31-2014), ecoTex (05-16-2014), jedi_sol (05-14-2014), JRMichler (05-13-2014), MetroMPG (10-01-2014), mikeyjd (05-14-2014), niky (05-14-2014), redpoint5 (05-17-2014), The donkey CRX (05-13-2014)
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 05-13-2014, 12:45 PM   #2 (permalink)
Master EcoModder
 
2000neon's Avatar
 
Join Date: Feb 2012
Location: Ontario, Canada
Posts: 596

VX - '94 Honda Civic VX
Team Honda
90 day: 47.95 mpg (US)
Thanks: 133
Thanked 89 Times in 66 Posts
The pictures loaded fine for me, the air dam and grill block look awesome!
__________________

  Reply With Quote
Old 05-13-2014, 12:58 PM   #3 (permalink)
is not covered in bees.
 
Istas's Avatar
 
Join Date: May 2009
Location: Seeley Lake, Montana, USA
Posts: 202

Honda - '05 Honda Accord EX
90 day: 32.86 mpg (US)
Thanks: 51
Thanked 42 Times in 21 Posts
Send a message via AIM to Istas
Quote:
Originally Posted by 2000neon View Post
The pictures loaded fine for me, the air dam and grill block look awesome!
Thank you very much!
  Reply With Quote
Old 05-13-2014, 02:03 PM   #4 (permalink)
EcoModding Lurker
 
Join Date: May 2012
Location: Evansville Ill.
Posts: 96

sizematters - '08 smart 4-2 passion cabrio
90 day: 51.99 mpg (US)

escape - '06 Ford Escape xlt
90 day: 26.78 mpg (US)

Buick - '04 Buick Park Avenue Ultra
Team Turbocharged!
90 day: 27.26 mpg (US)
Thanks: 196
Thanked 23 Times in 16 Posts
Have you thought about smooth wheel covers yet? You might get another few percent more mpg's.
__________________


  Reply With Quote
The Following User Says Thank You to chumly For This Useful Post:
101Volts (05-24-2014)
Old 05-13-2014, 02:32 PM   #5 (permalink)
is not covered in bees.
 
Istas's Avatar
 
Join Date: May 2009
Location: Seeley Lake, Montana, USA
Posts: 202

Honda - '05 Honda Accord EX
90 day: 32.86 mpg (US)
Thanks: 51
Thanked 42 Times in 21 Posts
Send a message via AIM to Istas
Quote:
Originally Posted by chumly View Post
Have you thought about smooth wheel covers yet? You might get another few percent more mpg's.
They are something I definitely will do; the only thing is, I don't think the alloy wheels can take hubcaps. I'd like to get a set of steel wheels, but that would be money. I'd like to make the alloy rims smooth, but that would involve things I'm not entirely comfortable with, like epoxying plastic panels into the openings, or drilling holes into the tops of the lugs and epoxying nuts into them as attachment points. If you have an easier (and reversible, and pothole/sun/wind proof) solution, please let me know.
  Reply With Quote
Old 05-13-2014, 08:09 PM   #6 (permalink)
Master EcoModder
 
mikeyjd's Avatar
 
Join Date: Mar 2013
Location: Grand Rapids, MI
Posts: 834

Matchbox - '93 Ford Festiva L
Team Ford
Last 3: 70.16 mpg (US)

Salamander - '99 Chrysler Concorde LXI
Team Dodge
90 day: 30.3 mpg (US)

Urquhart - '97 Toyota Tacoma 4x4 V6 3.4L DLX
Pickups
90 day: 25.81 mpg (US)

Smudge - '98 Toyota Tacoma
90 day: 40.65 mpg (US)

Calebro - '15 Renault Trafic 1.25 dci
90 day: 39.39 mpg (US)
Thanks: 1,365
Thanked 204 Times in 151 Posts
Quote:
Originally Posted by Istas View Post
They are something I definitely will do; the only thing is, I don't think the alloy wheels can take hubcaps. I'd like to get a set of steel wheels, but that would be money. I'd like to make the alloy rims smooth, but that would involve things I'm not entirely comfortable with, like epoxying plastic panels into the openings, or drilling holes into the tops of the lugs and epoxying nuts into them as attachment points. If you have an easier (and reversible, and pothole/sun/wind proof) solution, please let me know.
Custom DIY Smooth Wheel Covers
  Reply With Quote
Old 05-13-2014, 08:29 PM   #7 (permalink)
is not covered in bees.
 
Istas's Avatar
 
Join Date: May 2009
Location: Seeley Lake, Montana, USA
Posts: 202

Honda - '05 Honda Accord EX
90 day: 32.86 mpg (US)
Thanks: 51
Thanked 42 Times in 21 Posts
Send a message via AIM to Istas
MikeyJD: Ahh, zip ties. I want to avoid them as I worry about them weakening due to age, flexing, and exposure to the sun, and worry about wobble if the cover starts out, or shifts, off-balance.
  Reply With Quote
Old 05-13-2014, 08:53 PM   #8 (permalink)
is not covered in bees.
 
Istas's Avatar
 
Join Date: May 2009
Location: Seeley Lake, Montana, USA
Posts: 202

Honda - '05 Honda Accord EX
90 day: 32.86 mpg (US)
Thanks: 51
Thanked 42 Times in 21 Posts
Send a message via AIM to Istas
On second thought, maybe I will give it a shot. Coroplast can't do too much damage if it flies off at highway speed, right? Right?
  Reply With Quote
Old 05-13-2014, 09:35 PM   #9 (permalink)
Master EcoModder
 
Join Date: May 2012
Location: USA
Posts: 2,643
Thanks: 1,503
Thanked 270 Times in 223 Posts
FREAKING AWESOME!!!!!! You transformed the looks of the car completely!!!

I use zip ties in place of the fender clips to hold the various panels and front bumper of my insight. No problems with them breaking, stretching, etc.
  Reply With Quote
Old 05-13-2014, 09:48 PM   #10 (permalink)
is not covered in bees.
 
Istas's Avatar
 
Join Date: May 2009
Location: Seeley Lake, Montana, USA
Posts: 202

Honda - '05 Honda Accord EX
90 day: 32.86 mpg (US)
Thanks: 51
Thanked 42 Times in 21 Posts
Send a message via AIM to Istas
Quote:
Originally Posted by Cobb View Post
FREAKING AWESOME!!!!!! You transformed the looks of the car completely!!!

I use zip ties in place of the fender clips to hold the various panels and front bumper of my insight. No problems with them breaking, stretching, etc.
Body panels and front bumper are not subjected to 800+ rpm and are (somewhat) insulated from the shock of road bumps by the suspension, but I will take this as encouragement too. And thank you very much!

  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com