View Single Post
Old 04-26-2020, 12:15 PM   #69 (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
Quote:
Originally Posted by Tahoe_Hybrid View Post
the belly pan is a good idea it will need some air flow to prevent the gas from boiling(i live in the desert it gets upto 110-115 in the summer 90-100f is common)..


how do go about fixing the rear as the air issue (the air from the underbody gets shot straight up in the air exiting from the rear end) i guess this could be a significant source of drag
Is there a high pressure fuel pump in the tank? This has largely removed vapor lock in modern cars. Also I believe there is a return line so fuel should always be circulating to the tank, helping keep the lines cool. Insulate the fuel lines if necessary.

Read up about rear diffusers. Ideally the rear 1/3 of the full belly pan should taper upward slightly. Aerohead has suggested 5 degrees above horizontal is best for low drag. This reduces lift and drag and helps fill the rear wake.

Belly pans from the manufacturers leave the exhaust uncovered. This allows heat to escape while giving much of the benefit of a belly pan.
__________________
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.

Last edited by COcyclist; 04-28-2020 at 10:31 AM.. Reason: We started down a rabbit hole about boiling gasoline
  Reply With Quote
The Following User Says Thank You to COcyclist For This Useful Post:
aerohead (04-29-2020)