View Full Version : Rear Under-Car Diffuser idea - Mock up in cardboard
Chepsk8
03-04-2011, 03:51 PM
After reading many threads and asking many questions, finally made a mock-up of what I want to try out. I have no clue if it will work or not, but I have the time and metal, so why not?
Even if it does not work, it fills in empty space and will look cool!
http://img.photobucket.com/albums/v431/Chepsk8/RearUndercarCardboarddone.jpg
Pierre B
03-04-2011, 05:47 PM
This is just for looks, right? Most racecar diffusers work in conjunction with a smoothed and contoured underbelly, but FFRs typically have a lot of air turbulence under the vehicle due to the roughness of the bottom, and I think that will defeat any benefit you might otherwise get from such a diffuser. On the other hand, I once saw a post from a builder who had fashioned a smooth bottom for his car (probably an IRS), and had that working in conjunction with a front air dam and a diffuser similar to yours. Good luck, and keep us posted on the results.
riptide motorsport
03-04-2011, 06:22 PM
How about a flaT PLate covering the tank to cut out turbulance there, the rest of it looks great! ........Steven
That is really nice looking could we get a photo from the rear at eye level????
Mike N
03-05-2011, 07:21 AM
Dan. That would look killer but I have to agree that it won't do much of anything to increase downforce or decrease drag. I say go for it, I like it.
Check out this post on the other forum I saw for a diffuser and under car pan. Very nice!
http://www.ffcars.com/forums/showthread.php?t=266438&highlight=VIR+lap+times
Big-Foot
03-05-2011, 10:30 AM
I don't know that the fins themselves will do you much good, but anything you can do to clean up the undercarriage is a step in the right direction..
The back end of the FFR is like a parachute so I think it will help..
3kcarbon
03-06-2011, 09:25 AM
It would be a lot easier to fabricate if you left off the verticle fins on both sides. It may also improve airflow. Anything in the airflow creates parasitic drag. If you don't know the fins help they could easily be a negative. Wind tunnel and track testing could prove out the design. When in doubt keep it simple.
Chepsk8
03-06-2011, 10:23 AM
The middle fin is a separate piece, and will be added to the middle. I can easilly leave that out. But, being that the width of the twin channels is narrower at the entrance, and wider at the exit, don't they in theory help accellerate the air?
I also have some extra aluminum sheet, so I'll work on some sort of cover for the square tank.