As many of you know, Mazda published aerodynamic coefficients on the FD3s with and without the front air dam and the rear spoiler. To wit:

Baseline RX-7 RX-7 R2
Cd, drag coefficient 0.29 0.31
Clf, lift coefficient, front 0.16 0.10
Clr, lift coefficient, rear 0.08 0.08

It is probably not possible to calculate the lift in pounds by knowing this info and the front/rear weight distribution and other common info, but can it be done? If so, How?

If not, what is the least expensive method of measuring lift in pounds or whatever?

Bob

 

Wow nobody even tried to answer this. Sorry I just know what the numbers mean not how to calculate it. There is a magazine called "racecar engineering" you should subscribe if you like to know things like that. It's a bit expensive but very good. There was a guy somewhere on the forums with a post from the magazine that did a run of aero testing over a few months. Not sure if you can find it but good luck.

 

Thanks for the info - I will check out Racecar Engineering. I feel confident I can get
PSI using pitot gauges, but they will only be relative numbers (which would be helpful) in a before and after series of tests.