an important thing that must be fixed in Arma 3 compared to Arma 2 is the engine limitation that made the land vehicles (car, motorbikes...etc) unable to reach the real max speed.
for example in Arma 2 you had civilian vehicles (Volkswagen Golf, Yamaha TT650) that were unable the reach their supposed max speed, even by modifying their configs file.
efor example : even if you entered in the config maxspeed=190; the car was limited to barely 100km/h.
and this problem mostly occured with all the land Vehicles. few of them had real max speed compared to their real counterparts.