ha ha.I dont understand at all. lol. (seriously)
In a nut shell Tim trials is set up so that any car can race and be competitive. Cars are classed by there factory performance levels. So a 4 cyl mustang would be classed in TT "F" and a new corvette in TT "A".
The modifications made to a car will access points. After you hav accessed20+ points your car will will move up one class. So the 4 cyl mustang would jump from "F" to "E" and then compete with the other cars classed in "E".
Each modification earns a certain amount of points. Example lower springs may take a +4 and "R" comp tires a +7. After you exceed 20 points the car moves up one class and it takes 39 points to move up another class.
Its a way to keep all cars on a somewhat level playing field. Obviously some are just better than others in base form so its not a exact science.
So in my cars case I want to keep the car classed in "D" so to do so I cant exceed a +39 in points.
The next class up for me would be "C" and there are some seriously fast cars in "C". I dont think the car can compete in "C". If I moved up to "B" I would be allowed to make enough mods to compete. The allowed points to move into "C" wont be enough to make the needed mods to be competitive.
Yeah its confusing but that also makes it fun as you need to actually sit down and calculate what the best mods are to make the car go fast while staying with in a certain amount of points.