The race support company that maintains and preps the car has track data for basic setup which is done in the shop before an event;
first track day is always testing so we have a few sessions to dial it in. The service for a weekend includes mechanic/pit crew, catered breakfast & lunch, the truck has a driver's lounge, they even clean our suits and helmets. Basically, arrive and drive.
Depending on the race we may have as many as six cars & drivers in the "team".
"If you analyse the function of an object, its form often becomes obvious." - F.A. Porsche