u mean what is the meaning of FF and FR or which car is FF and which is FR, etc?

FF=Front engined Front wheel drive
FR=Front engined Rear wheel drive
RR=Rear engined Rear wheel drive
MR=Mid engined Rear wheel drive (midship)
F4=Front engined Four wheel drive (4WD)... ok i invented this 'F4' i donno if the abbrevation actually exists. coz a 4WD car does not neccessarily mean its got a front engine. real life example: Porsche 911 Turbo, its a rear engined four wheel drive.
in LFS it only describes where the power is driven to (eg front wheel drive or rear wheel drive), but you can tell whether its a front engined or midship layout by looking at the weight distribution.

anyway,

XF GTi = FF
XF GTR = FF
XR GT = FR
XR GT Turbo = FR
XR GTR = FR
FXO Turbo = FF
FXO GTR = F4 (4WD)
RB4 GT = F4 (4WD)
MRT = MR
LX4 = FR
LX6 = FR
FZ50 = MR
FZ50 GTR= MR
UF 1000 = FF
UF GTR = FF
Formula XR = MR
Formula V8 = MR
RaceAbout (RA) = MR

Yea .. i'm oversteering way too much. Still can't control the car. Using keyboard .. kinda hard. I have a joypad but i failed to set it up properly. ._.