Someone can tell me why it happen, and how can i solve it? In a certain distance, parts of the car will disappear
That usually happens when the LOD values of meshes have been set improperly. The only way to solve that, is to set them better in the gen file of the mod.
You can also raise the OPPONENT DETAIL setting to see if that helps, as a modder may of made better use of LODs at higher settings.
Check that "Auto Detail FPS" is Off in your video settings in the game. It can make things disappear strangely (probably in combination with various mod settings as above) if activated.