I am working with a driver that racers with NASA and he has the option of going with a wing or flat bottom/diffuser. The way the cars are classed he pays "points" for different modifications so while we could do both, doing so would cost too many points and bump him up to the next class.
More details:
2005 Mazdaspeed MX5 Turbo.
300 hp
2610 minimum weight (w/driver)
225/45/ZR15 DoT Hoosier R6 (or A6 for qualies)
Hardtop with lexan windows
Currently no aero, but a front undertray to the centerline of the front wheels will be added (and is free, no point mod).
An adjustable front splitter is being built as well.
So, the question is which is better? Flat Floor with small skirts and a diffuser or a rear wing?
Wing can be 8 inches above the roof line, so clean air is no problem. Drag is the main concern as the championships are at Miller in 2010 and straight line speed is key.
Diffuser has is low drag, but not adjustable and can't be changed.
The goal is to add downforce for high speed corners like Mid Ohio turn 1, or Miller, the end of back straight sweeper before Attitudes. These are examples of the kind of corners where we want to add grip.
Note: Tire size cannot be increased without drastic changes, i.e. fender flares, new wide wheels, etc. We want to stay with a narrow/skinny car.
Richard? Steve? Anyone?
Thanks for any and all help!