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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 11-06-2014, 03:03 PM   #21 (permalink)
Master EcoModder
 
Sven7's Avatar
 
Join Date: Aug 2011
Location: Warren, MI
Posts: 2,456

Boo Radley - '65 Ford F100
90 day: 13.28 mpg (US)
Thanks: 782
Thanked 667 Times in 409 Posts
Quote:
Originally Posted by Daox View Post
Lots of OEMs put their dams back farther like you did though, so there still must be some benefit.
Sometimes they just want a good approach angle. The truck's up so high it probably wouldn't hurt to push it forward. Maybe scoot it a half inch at a time and see when it scrapes...

Anyway, the build quality looks pretty good and I'm interested to see how that aero cap comes along.

__________________
He gave me a dollar. A blood-soaked dollar.
I cannot get the spot out but it's okay; It still works in the store
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 11-06-2014, 05:13 PM   #22 (permalink)
Master EcoModder
 
aardvarcus's Avatar
 
Join Date: Apr 2012
Location: Evensville, TN
Posts: 676

Deep Blue - '94 GMC Suburban K2500 SLE
90 day: 23.75 mpg (US)

Griffin (T4R) - '99 Toyota 4Runner SR5
90 day: 25.43 mpg (US)
Thanks: 237
Thanked 580 Times in 322 Posts
Wdb,
The older information and older pictures of the Colorado from about six months ago (when I was seriously considering waiting for one) didn’t have the air dam on the Z71 models, just the base, work truck, and LT. Now it appears they have the air dam on all the models, probably for on road stability reasons. If you look on their website though you can still see some of the older photos up of the Z71s without them.

Sven7,
I looked long and hard about moving it to right under the front bumper cover. Since mine is rubber, it doesn't matter at all if the dam scrapes or drags, but since I actually offroad the truck a bit, I didn't want to risk dragging the aluminum subframe, since that could potentially damage the truck or puncture a tire if it came off. I could mount if more forward, but it would complicate the mounting significantly.

If I didn't offroad and want the clearance, the X-runner Tacoma has some interesting aerodynamic lower molding pieces on the front bumper, sides, and back that I would probably try to retrofit. Toyota has the 2WD Pre-Runner access cab at CD 0.394, but the 2WD X-Runner access cab at CD 0.357. So there are factory toyota bolt on fairings available that could reduce CD by 0.037. Nothing to sneeze at.
  Reply With Quote
Old 11-07-2014, 07:36 AM   #23 (permalink)
Master EcoModder
 
aardvarcus's Avatar
 
Join Date: Apr 2012
Location: Evensville, TN
Posts: 676

Deep Blue - '94 GMC Suburban K2500 SLE
90 day: 23.75 mpg (US)

Griffin (T4R) - '99 Toyota 4Runner SR5
90 day: 25.43 mpg (US)
Thanks: 237
Thanked 580 Times in 322 Posts
Well, I only got part of my V1.2 list done, so I am labeling this as V1.1 for now. I was able to reshape the outer radii into a tighter arc, and trimmed about one inch off of each end. This should keep the air from drastically overshooting the tire, but I don’t know for sure that I didn’t overcorrect and bend it too far.

Looking again at how close my tow hook is to my aluminum air dam frame, I was unable to increase the slope in the two flatter parts of the middle towards the side, so that idea was a no go for now. Further examining Hucho’s book and the many charts it contains, I decided to cut out the center middle of the air dam, 1” tall by 28”sloping to 34” wide.

Inspecting other charts in the book that had heights of air dams and placements front to back, my far back placement of the air dam appears to have some but not overwhelming impact on the available reduction in drag coefficient, but clearly had implications on available reductions in front lift coefficients. Honestly it’s already better than stock, so I think I can live with that for now.

Examining the charts in the book further, a front lip on the air dam was shown in the book with positive results, so I began testing attaching some pieces of rubber fuel hose to a scrap of conveyor belt to act as a lip when I ran out of time to work. I quickly re-bolted the air dam on, a let than five minute job.

Anyway, here are some pictures of V1.1 as I reinstalled last night. Based on some “coast down hill” type tests this morning, V1.1 appears to have slightly lower drag than V1.0, but there are way too many variables to know for sure right now.









Attached Thumbnails
Click image for larger version

Name:	101_9207.JPG
Views:	810
Size:	65.5 KB
ID:	16316   Click image for larger version

Name:	101_9208.JPG
Views:	770
Size:	69.5 KB
ID:	16317   Click image for larger version

Name:	101_9209.JPG
Views:	778
Size:	74.5 KB
ID:	16318   Click image for larger version

Name:	101_9211.JPG
Views:	780
Size:	64.6 KB
ID:	16319   Click image for larger version

Name:	101_9212.JPG
Views:	765
Size:	64.0 KB
ID:	16320  

  Reply With Quote
The Following User Says Thank You to aardvarcus For This Useful Post:
aerohead (11-07-2014)
Old 11-07-2014, 01:31 PM   #24 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 27,562
Thanks: 7,738
Thanked 8,554 Times in 7,041 Posts
Good improvements. The notch in the lower edge is good because unpaved roads tend to have a high center. I regularly re-grade my friends driveway.
  Reply With Quote
Old 11-08-2014, 09:30 AM   #25 (permalink)
Master EcoModder
 
aardvarcus's Avatar
 
Join Date: Apr 2012
Location: Evensville, TN
Posts: 676

Deep Blue - '94 GMC Suburban K2500 SLE
90 day: 23.75 mpg (US)

Griffin (T4R) - '99 Toyota 4Runner SR5
90 day: 25.43 mpg (US)
Thanks: 237
Thanked 580 Times in 322 Posts
Insomnia struck again, so I got up early and put the tube lip on my airdam. I ended up drilling holes through the rubber tube, putting a rivet though the inside of the tube through the conveyor belt. I used a washer on the back side to expand the rivet into, so it wouldn't just pull through the conveyor belt. Made a pretty solid connection, and the fasteners semi-hidden from view.

I need to put something over the end of the tube to hide the gaping hole for cosmetic reasons. It is also getting about time to take it off and paint the aluminum. I am about ready to call this project "good enough for now" and start working on the bed cover.

Any thoughts, suggestions, or ideas are welcome though.








Attached Thumbnails
Click image for larger version

Name:	101_9213.JPG
Views:	721
Size:	72.3 KB
ID:	16332   Click image for larger version

Name:	101_9215.JPG
Views:	782
Size:	75.1 KB
ID:	16333   Click image for larger version

Name:	101_9216.JPG
Views:	760
Size:	72.4 KB
ID:	16334   Click image for larger version

Name:	101_9217.JPG
Views:	754
Size:	76.9 KB
ID:	16335  
  Reply With Quote
The Following 3 Users Say Thank You to aardvarcus For This Useful Post:
aerohead (11-08-2014), BamZipPow (11-08-2014), mikeyjd (04-07-2015)
Old 11-08-2014, 03:39 PM   #26 (permalink)
T-100 Road Warrior
 
BamZipPow's Avatar
 
Join Date: Apr 2008
Location: The Woodlands, TX
Posts: 1,920

BZP T-100 (2010) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
Last 3: 24 mpg (US)

BZP T-100 (2011) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
Last 3: 23.66 mpg (US)

BZP T-100 (2009) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
Last 3: 19.01 mpg (US)

BZP T-100 (2012) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
Last 3: 25.45 mpg (US)

BZP T-100 (2013) - '98 Toyota T-100 SR5
Last 3: 25.79 mpg (US)

BZP T-100 (2014) - '98 Toyota T-100 SR5
Last 3: 23.18 mpg (US)

BZP T-100 (2015) - '98 Toyota T-100 SR5
Last 3: 23.85 mpg (US)

BZP T-100 (2016) - '98 Toyota T-100 SR5
Last 3: 17.62 mpg (US)

BZP T-100 (2017) - '98 Toyota T-100 SR5
90 day: 20.78 mpg (US)

BZP T-100 (2018) - '98 Toyota T-100 SR5
90 day: 20.19 mpg (US)

BZP T-100 (2019) - '98 Toyota T-100 SR5

BZP T-100 (2020) - '98 Toyota T-100 SR5

2012 Scion iQ - '12 Scion iQ Base
Thanks: 3,479
Thanked 1,395 Times in 968 Posts
Send a message via ICQ to BamZipPow
Expanding foam would work to plug up the ends of the tubing...
__________________
Dark Aero-The world's first aerodynamic single wheel boat tail!

  Reply With Quote
Old 11-10-2014, 06:49 AM   #27 (permalink)
Master EcoModder
 
aardvarcus's Avatar
 
Join Date: Apr 2012
Location: Evensville, TN
Posts: 676

Deep Blue - '94 GMC Suburban K2500 SLE
90 day: 23.75 mpg (US)

Griffin (T4R) - '99 Toyota 4Runner SR5
90 day: 25.43 mpg (US)
Thanks: 237
Thanked 580 Times in 322 Posts
Well, I removed the air dam, got the aluminum painted flat black, let it dry to the touch, and got it reinstalled yesterday.





Attached Thumbnails
Click image for larger version

Name:	101_9218.JPG
Views:	772
Size:	71.6 KB
ID:	16357   Click image for larger version

Name:	101_9219.JPG
Views:	786
Size:	59.8 KB
ID:	16358   Click image for larger version

Name:	101_9220.JPG
Views:	769
Size:	81.9 KB
ID:	16359  
  Reply With Quote
The Following 2 Users Say Thank You to aardvarcus For This Useful Post:
BamZipPow (11-19-2014), mikeyjd (04-07-2015)
Old 11-10-2014, 09:20 AM   #28 (permalink)
Administrator
 
Daox's Avatar
 
Join Date: Dec 2007
Location: Germantown, WI
Posts: 11,203

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
Mitsubishi
90 day: 56.69 mpg (US)

Daox's Volt - '13 Chevrolet Volt
Thanks: 2,501
Thanked 2,585 Times in 1,553 Posts
Looks good to me.
__________________
Current project: A better alternator delete
  Reply With Quote
Old 11-10-2014, 09:28 AM   #29 (permalink)
Master EcoModder
 
Sven7's Avatar
 
Join Date: Aug 2011
Location: Warren, MI
Posts: 2,456

Boo Radley - '65 Ford F100
90 day: 13.28 mpg (US)
Thanks: 782
Thanked 667 Times in 409 Posts
What's the reason for the tube lip?
__________________
He gave me a dollar. A blood-soaked dollar.
I cannot get the spot out but it's okay; It still works in the store
  Reply With Quote
Old 11-10-2014, 11:53 AM   #30 (permalink)
T-100 Road Warrior
 
BamZipPow's Avatar
 
Join Date: Apr 2008
Location: The Woodlands, TX
Posts: 1,920

BZP T-100 (2010) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
Last 3: 24 mpg (US)

BZP T-100 (2011) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
Last 3: 23.66 mpg (US)

BZP T-100 (2009) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
Last 3: 19.01 mpg (US)

BZP T-100 (2012) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
Last 3: 25.45 mpg (US)

BZP T-100 (2013) - '98 Toyota T-100 SR5
Last 3: 25.79 mpg (US)

BZP T-100 (2014) - '98 Toyota T-100 SR5
Last 3: 23.18 mpg (US)

BZP T-100 (2015) - '98 Toyota T-100 SR5
Last 3: 23.85 mpg (US)

BZP T-100 (2016) - '98 Toyota T-100 SR5
Last 3: 17.62 mpg (US)

BZP T-100 (2017) - '98 Toyota T-100 SR5
90 day: 20.78 mpg (US)

BZP T-100 (2018) - '98 Toyota T-100 SR5
90 day: 20.19 mpg (US)

BZP T-100 (2019) - '98 Toyota T-100 SR5

BZP T-100 (2020) - '98 Toyota T-100 SR5

2012 Scion iQ - '12 Scion iQ Base
Thanks: 3,479
Thanked 1,395 Times in 968 Posts
Send a message via ICQ to BamZipPow
Wink

Quote:
Originally Posted by Sven7 View Post
What's the reason for the tube lip?
Probably fer reinforcement...

__________________
Dark Aero-The world's first aerodynamic single wheel boat tail!

  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com