View Single Post
Old 04-07-2012, 04:10 PM   #102 (permalink)
ERTW
EcoModding Apprentice
 
ERTW's Avatar
 
Join Date: Jan 2012
Location: Toronto
Posts: 130

Bu - '08 Chevrolet Malibu LS
90 day: 32.29 mpg (US)
Thanks: 52
Thanked 73 Times in 36 Posts
Quote:
Originally Posted by MetroMPG View Post
That's what I meant to say: coastdown test, coastdown test, coastdown test.
you mean wind tunnel. that's how oem's decide on the shape of the spoiler - depending on whether they want to decrease drag, and/or lift. aero is very counterintuitive. that's why oem's spend hundreds of hours shaping bodies...after hundreds of computer hours running CFD.

as well intentioned as a person may be, coast down tests need to follow a rigorous and disciplined procedures. properly done, they have very good correlation to wind tunnels. a handful of casual coast down tests are a waste of time.
  Reply With Quote