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For autocross?

Good tires (no cords)
Wheel bearings, no play
Lug nuts, all present
Throttle return working
Battery tied down
Trunk, passenger area empty
M90 or SA90 helmet (loaners usually available)

 

I guess, Solo II

 

You'll want to have your lugs nice and tight too, ~80lbs-ft. I believe there is a minimum tire pressure requirement of something like 30psi, but you'll want to be well above that anyways for optimal tire performance and life.

 

There is no minimum tire pressure but common sense says that on street tires you probably want 40+

DO NOT OVERTORQUE YOUR LUGS - Use the factory recommended setting (often 80ft-lbs) The odds are good if you are not changing tires you don't need to worry about this.

 

Some tracks require at least a 3-point harness?

 

thats a stock seatbelt on post 1980(?) cars...

 

I'll add:

brake has to had feel
no loose body panels (like accidents)
M90 and SA90 will expire at the end of this year
no loose items in your car
a working seat belt
and some place require a working exhaust (no unbolting of your exhaust)