There are many forms of automotive sport (Nascar,IRL, ChampCar,Rally). These different types of racing will require different levels of detail when it comes to racing drivers making set-ups and adjustments (on the car itself).
But with respect to the different types of racing (mentioned), to what degree does the set-up of the car make the difference between winning and losing? How important is it within these respective groups to have the set-up of the car well-balanced and (basically) fast?
For example, on a scale of 1 to 10 (with 10 being the highest level of importance in car set-up) where would you rate the various types of racing? Would rallying get 10? IRL get 8? ChampCar get 1?
Also, when the drivers set-up thier cars how much input do they have in the final package? I always thought that race engineers are the dudes that get to work more on the set-up, whilst the driver simply drives? I know there is some communication between the two, but I always thought this was minimal (in order to allow both to get on with thier respective jobs).
Are there any drivers (from any of the mentioned categories of driver sport) who were real specialists at setting-up the car? How much input did these particular drivers have? And what is it that they did so well in order to be acknowledged as such?