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Old 10-04-2013, 10:02 AM   #31 (permalink)
Aero Wannabe
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Join Date: Dec 2007
Location: NW Colo
Posts: 718

TDi - '04 VW Golf
90 day: 50.21 mpg (US)
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Originally Posted by ron22 View Post
Have you ever looked real close under your Jetta or Golf? VW did a lot of work under there to streamline it. There are a lot of little plastic pieces that deflect air over/around parts. There is one in front of the rear axle and a few others. I think a full belly pan is better.
Agreed. I was able to tuck brake cables up and really smooth the underside if my car.

I have noticed that little spoiler ahead of the rear axle on my wife's 2011 A3 TDI. I have wondered if removing it and installing a belly pan to the rear of her car would be better. FWIW the Mk IV doesn't have that same plastic deflector. The newer VW/Audis have a lip that turns down just before the rear axle. In the pic Ron posted you can see that on the Mk IV it is flush with the axle.

Ron, what year is your TDI?

60 mpg hwy highest, 50+mpg lifetime
TDi=fast frugal fun

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.

Last edited by COcyclist; 10-04-2013 at 12:56 PM..
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