Originally Posted by Bryce (Post 390385)

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.

Originally Posted by Bryce (Post 390522)

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.

Originally Posted by Bryce (Post 873339)

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.

Originally Posted by GregWeld (Post 390526)

I actually always wondered what the diffuser actually did.

Originally Posted by skatinjay27 (Post 390528)

look super cool duh!!!