Opportunity to prevent a short distance from the bottom of the car before the roadway can reduce the location of the frame and all major units, which reduces the height of the center of gravity. In addition, all units having. Great weight, located near the center of gravity, thereby reducing the moment of inertia of the vehicle about a vertical axis passing through the center of gravity, which makes the vehicle entrance and exit from the bends at high speed. 
Modern road-racing cars have a high mobility: small dimensions allow for small radius turns, and good resistance n control allows you to pass these corners at high speed. 
The main issues the general layout of a race car is a choice: the location of the engine, drive to the front or rear axle type of aggregates used, body shape, determination of dimensions and main parameters of the car.