designed to change the trim of the car is to improve the lap times, or make it more manageable, or, as often happens, both. A car easier to drive allows for better times and more consistent, than to trust the pilot, who will need it when the situation becomes more competitive, and this is perhaps the most important thing.
Even before you start thinking to change the attitude, we must consider these two aspects: first, the machine is in perfect condition? We must ensure that all suspension components act without effort, without excessive, and that the machine does not have strange settings. Things like this can really make unpredictable behavior.
Second, beginning with the tires. If the tires are the wrong type, the time you go to work on the set everything is wasted: the machine will never be as fast as it could.
The first step in changing the fundamental structure is to determine what factors affect the behavior you want to change. Experienced pilots and mechanics, and generally people with a good knowledge of the dynamics of vehicles, or already know the 'feel'. To know what to change, you must know the function of each element. For example: Change the convergence at the front does not change the balance of the car, but the inclusion behavior in curves. From the material presented in previous chapters should be clear, but in practice it may be difficult to evaluate the difference between the actual behavior of the machine and the desired one.
Here are some examples.
suppose to run on a track wide and smooth, with many small irregular rhythms of the land. Do not think to take both a smooth adjustment of springs and shock absorbers, and a very low roll center, the machine tilts from side to side with the bumps, making it very unstable, unpredictable and poor traction. In this case, tighten the springs and shock absorbers will increase traction, but will not be the best option, but that would raise the roll center, ensuring that it remains high when the frame tilts. Note that if you follow the roughness almost rhythmically, a choice of soft springs and shock absorbers will "go into resonance" the frame, with a strange feeling of instability. In this case, it would be better to tighten a little 'shock absorbers and maybe the springs. so the car would jump on top of the irregularities without sinking in a hollow. The roll is not the only possible source of problems on a bumpy track, if the suspension is too bad race, you may suffer from excessive pitching. The solution is simple: reduce the negative stroke of the suspension. Although this increases the risk that the chassis touches the ground in great leaps, the stability will improve in areas of very bumpy, especially in detached and accelerated.
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