Well, here it is two and a half years later...and I haven't done much on the car. I did get some lighter wheels (by 12 lbs each) and some narrower tires (215s vice 225s) that save another 4lbs each. And a window-screen lower grill semi-block to reduce airflow and prevent sand & pebbles from getting to the AC condenser & radiator.
I'm nervous about reducing airflow through the engine compartment too much, what with the two very hot and very expensive little turbochargers that live in there.
Then today, I was supposed to be replacing the rear main seal in one of the Miatas. So suddenly playing with cardboard looked like the better option. I put together a little Kamm and a fairing behind the fender flares.
The pictures were taken in the dark...I had to use some extreme measures to make the Kamm visible, but the lines drawn on the first picture follow the profile pretty faithfully. Maybe in daylight I'll get some better pictures.
Next step should probably be some sort of tuft testing. If I can figure out how to mount a camera back there, I'll try that. The weirdly light pattern on the Kamm is some housepaint I drizzled on with the hopes that the airflow would move it around when I took a test drive. Instead it just dried in place.
