View Single Post
Old 05-03-2010, 04:21 PM   #6 (permalink)
COcyclist
Aero Wannabe
 
COcyclist's Avatar
 
Join Date: Dec 2007
Location: NW Colo
Posts: 738

TDi - '04 VW Golf
TEAM VW AUDI Group
90 day: 52.55 mpg (US)
Thanks: 705
Thanked 219 Times in 170 Posts
On the coast down testing, the higher speed 70-50 mph runs should be accurate enough to tell if it's helping or hurting. If you have a GPS and a passenger with a stopwatch, you can eliminate some of the human error. Try to do it on a calm day, in both directions on the same stretch of road and A-B-A runs if possible.

As for the scraping, in my experience the corners of the airdam scrape the most. Hopefully the bumper skin is flexible enough to bounce back. I agree that you may want to try a partial belly pan in the future. Very clever flip/flop air dam.
__________________
60 mpg hwy highest, 50+mpg lifetime
TDi=fast frugal fun
https://ecomodder.com/forum/showthre...tml#post621801


Quote:
Originally Posted by freebeard View Post
The power needed to push an object through a fluid increases as the cube of the velocity. Mechanical friction increases as the square, so increasing speed requires progressively more power.
  Reply With Quote