Excellent photos EXCEPT for one tip.
This especially applies to the car 51 shot.
I did the same thing at Watkins Glen some 30 years ago at a Gran Prix using
ASA 400 Tri-X film. Pan technique was just about perfect; shot at 1/500 sec.
Got great shots of static cars!
All looked like they were shot parked at 1/30 sec.
Good tip is to try some of them at a slower shutter speed to show some forward
motion blur to give a sense of speed.
Try it. It may not be to your taste or what you really want but try a couple anyway.
-TomK-