Some tools, some fuel, a gallon of water (or at least an empty container), a trolley jack (even one of those small ones), a torque wrench (for wheel nuts), a tyre pressure gauge, a spare spare wheel if you have one, and a box or container to put all of the above in when you empty it all out of your car at the track.

Thats always a good basis of equipment for a track day.

Remember to take your helmet, plus your arms, and lewis's eyes may need to be covered

Have fun