OK, between races:

Clean tires, remove tires from car and put car on jack stands.

Nut and bolt, check rotors, pads. Bleed brakes every other race.

On BMW, valve adjustment and leak down test. Before ARRC dyno test to see if head needs to be freshened. Freshen head if necessary.

On RX7 change fluids.

Check corner weights depending on how car is handling.

Check N2 charge in shocks.