Is there any prefix or a way to change the rendering/drawing distance of an object? I added some 3D environment with mountains to a track to get a environment closer to the real life track, but the rendering distance of it is really low, it only render a little part of one of the mountain when you are really close to it, nothing more 
You may be able to change the line in your profile.ini
It can be found in the Documents>PiBoSo>KartRacingPro>profiles
Try changing:
[gfx]
drawdistance=1000.0
Increase from 1000 to 1500 to start off. I believe the unit would be meters, but I could be wrong.