basizeland wrote:... from what I understand you dont want the red pressure areas but you dont want the low pressure areas either as it is affecting the flow around the car, so you are aiming to have as little change to the flow as possible ...
That's the general idea. Changing pressure means that some time of work is done to change the motion of the fluid. If you minimize the pressure change, you minimize the work and thus the drag. This is why wings have what is called induced drag, or drag to lift. As the lift (or downforce depending on your axis system) increases, the pressure changes have to increase as well, which increases there is more work being done on the fluid, and thus more drag results. Since downforce doesn't play a role with this cars, you would be looking to maintain the pressure as consistent as you can.