Ok understand,
do you fast racers have some sort of setup values in mind that you never change?
I guess it depends of the car class of course.
What are your set values (if any) for the DTM 92 Cars not the Audi, but the RWD cars?
Or you guys just play around with all the values from the basic setup until it fits?
That's some massive question with only a few words, lol!
A real reply to that would be a few pages long and roundup a whole setup build process.
In the end you mostly have to adjust EVERYTHING to keep the balance of a car. If you want to CHANGE the balance of a car however, then you don't need to.
It really is a long process and the only real way to get that right is to build feel and knowledge about all settings and then decide based on telemetry and gut-feeling what to change.
A little example of how to build a setup:
1. Default is mostly fine so don't touch anything at all and just learn how to drive.
2. Okay just kidding but it has a true core!
3. Aero! This changes all speeds of the car. Keep the balance and adjust that first.
4. Springs and Ride Height. Rake influences the behavior quite an amount while a lower car drives more aggressively on the limit.
The springs adjust the general "stiffness" of the car. You need to test if the car feels too soft or stiff for you. In general a softer car has more grip but is more difficult to handle. A stiffer car is easier to handle but will start to bounce too much at some point.
5. Anti-Roll-Bars: stiff ones make the car easier to drive but you'll lose grip at some point. While the front ARB mostly are felt due to understeer or oversteer, the rear ARB will make a big difference for corner entry oversteer (at low settings) and corner exit traction loss (at high settings).
6. Dampers: high damper settings make the car a lot easier to handle but Kerbs can bump up the car and bumps will be more aggressively. If you lose the car and don't know why, bump up the dampers!
7. Camber: too much camber is really difficult to feel imho but too low camber settings will result in some weird sliding of the tyres. Like you feel that the rubber has grip but you slide nonetheless...
Overall these are really quick and subjective words that don't sum it up correctly in any way but it may help you to go the first steps!
I'm studying engineering and I think I spent already around 50h just reading and testing setup settings, car physics and analyzing telemetry. I still don't know how to make a car scientifically faster!