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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 04-21-2013, 01:59 PM   #11 (permalink)
LurkoModding Ecker
 
Join Date: Sep 2008
Location: Da Desert
Posts: 51

new beetle - '98 Volkswagen Beetle GLS
90 day: 32.98 mpg (US)
Thanks: 0
Thanked 2 Times in 2 Posts
I had another thought. Since you don't want to do a major mod like a boat tail or a large kammback. Why not just incorporate it in the chop. You are already chopping the roof, why not take an extra inch or two from the back and give the roof natural gentle slope down.

__________________

Quote:
When I am working on a problem, I never think about beauty but when I have finished, if the solution is not beautiful, I know it is wrong. -Buckminster Fuller
  Reply With Quote
The Following User Says Thank You to binarycortex For This Useful Post:
Enki (04-21-2013)
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 04-21-2013, 03:08 PM   #12 (permalink)
EcoModding Apprentice
 
Enki's Avatar
 
Join Date: Jun 2011
Location: N/A
Posts: 140
Thanks: 32
Thanked 28 Times in 20 Posts
My fabrication guys suggest that anything more than 3 inches of chop will require sectioning of the roof to get the pillars to line up again, which means I could do that sort of modification but I would not have a chop up front. That would also significantly change the shape of the original body, which is something I'd like to avoid if possible (the full chop keeps the original lines, just shorter/less frontal area); having the original lines (minus the chop) is preferable.

It would probably be easier to add small, sharp lips to cleanly separate airflow from the body while keeping significantly more of the stock-ish look.

Also, it's not that I wouldn't want a kammback or boat tail for aero reasons, but this thing is already very long body wise; adding either of those would make it a road yacht for sure.

I'm still not sure what kind of benefit I will even get from doing the mods I already have planned; I just hope it gets the Cd down enough that the CdA comes in line with what my Mazda has already.
__________________
  Reply With Quote
Old 04-21-2013, 07:05 PM   #13 (permalink)
Master EcoModder
 
JRMichler's Avatar
 
Join Date: Feb 2011
Location: Phillips, WI
Posts: 969

Nameless - '06 GMC Canyon
90 day: 32.2 mpg (US)
Thanks: 186
Thanked 395 Times in 255 Posts
Take it on the road and do a tuft test on the hood. If it has reverse flow, you may need some sort of bullet nose. Rear aero needs attached flow.

That's why Dodge put the bullet nose on the 1970 Dodge Charger Daytona.
__________________
The vacuum gauge plus wheel covers helped increase summer 2015 mileage to 38.5 MPG, while summer 2016 mileage was 38.6 MPG without the wheel covers. Drove 33,021 miles 2016-2018 at 35.00 MPG.
  Reply With Quote
The Following User Says Thank You to JRMichler For This Useful Post:
Enki (04-21-2013)
Old 04-21-2013, 07:20 PM   #14 (permalink)
EcoModding Apprentice
 
Enki's Avatar
 
Join Date: Jun 2011
Location: N/A
Posts: 140
Thanks: 32
Thanked 28 Times in 20 Posts
A great idea, and one I knew of but forgot about. Sadly, I'll probably be limited to testing at highway speeds (80 MPH) but hopefully that will be enough information to keep me from flying around above 200.

__________________
  Reply With Quote
Reply  Post New Thread


Thread Tools




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