Has anyone on here made their own rear diffuser panel? I would assume so based on some of the project pics but Im kinda interested in in hearing how they did it and how they mocked it all up. Im thinking that it might be the type of thing I wanna do to my 65 Mustang to really set it apart from the crowd.
I am just about to build my diffuser for the falcon. But to make it really functional you need to have an understanding of aero nad should probably have a full belly pan.
I am just about to build my diffuser for the falcon. But to make it really functional you need to have an understanding of aero nad should probably have a full belly pan.
Bryce --- I think he's doing this for looks rather than trying to set the land speed record...
At what speed do you think you'd need to be going to actually get any "aero" out of a rear diffuser?
At about 100mph you will start seeing the benefits. With that being said, my family car is a 2000 durango with a 5.2. I have been doing aero testing with it. When I first bought it I was getting 17mpgs at 65mph. On the same road I am now getting 24mpgs. I still have some more tricks that I have not done yet.
At about 100mph you will start seeing the benefits. With that being said, my family car is a 2000 durango with a 5.2. I have been doing aero testing with it. When I first bought it I was getting 17mpgs at 65mph. On the same road I am now getting 24mpgs. I still have some more tricks that I have not done yet.
Wow! That is impressive!
We all know what it's like to push a brick thru the air.
thanks greg, let me rephrase my last statement. You can reduce aero drag at any speed, but to get enough pressure differential to obtain any downforce you will need to be approaching 100mph. See this thread here: http://www.pro-touring.com/showthrea...h-Aerodynamics
Quote:
Originally Posted by Bryce
John,
I think your goal should be reducing drag, unless you are doing a lot of driving over 100mph, you will not see a lot of down force with simple body mods.
1. The air dam needs to be very close to the ground to be effective. I would extend the air dam in the vertical direction only. A front slitter will work by creating a pressure differential between the top and bottom, this can be tested using pitot tubes or monometers. If you build a splitter you should be able to stand on the thing without any deflection. If it deflects it will be les effective.
The nose on the car should be blocked off as much as possible only have as much air as needed going through the radiator.
The stock air dam is there to prevent air from coming into the engine compartment from underneath the car.
2. Do you have a picture of the hood, most hoods I see have intakes just for looks, most of the time the intake is in a low pressure area the hood. The base of the windshield is the second highest pressure area on the car. You cannot vent air into a high pressure area.
3. That may work, but without testing it would just be a hypothesis. In theory vortex generators work, nut its main use is to get air onto the spoiler. What you always want to consider is how do I make the air transition back into the flow stream easier. Trailing edges that are squared off rejoin easier with less turbulence (drag) than curved edges. Those trailing edges should be vertical and/or horizontal. The roof could benefit from a horizontal spoiler, think SUVs.
4. Spoilers add drag when they add down force. A diffuser slows down the air so that is can rejoin the flow stream with less turbulence. But a diffuser needs to be designed not just for looks. To be the most effective the car should have a full belly pan. I am designing a rear diffuser for the falcon right now.
I believe the Roadster Shop has built some great looking rear diffusers. Go to their site and check the build gallery.
The benefits of aerodynamics is typically under-rated IMO, Formula 1 is a great example of the advantages. Ever year the FIA enacts regulations to slow the cars down and the aerodynamisists and seem beat them on a regular basis with very subtle yet intensively researched modifications.
Brian Hobaugh SCCA National Tour June 2014
First Hemi 'Cuda Convertible Ever Built
Short clips: Goodguys Pleasanton autocross and pit videos
Rear Diffuser
Linear Mode
