Very realistic for the chassis. They did a great job. Power wise they are missing the ability to blip the throttle to pitch the kart and actually drift it through corners but that isn't really needed except for tighter tracks. They need to drop 4-5 teeth for these tracks. Steering is a bit off because the physics act like the rear is all the way out and the front is all the way in which is very wrong for high speed cornering.
The braking is wrong force feedback wise and regarding oversteer. In fact, the entire FFB is wrong as the steering feels numb a bit. Top speed is wrong for a kt100s.
Edit: And the slipstreaming is straight out of a Disney movie
And they did hit the speed right for a 100cc air cooled engine. We've got a couple of street races here where we are upwards of 72mph in a restricted engine and around 82mph in the pipe (which these are)
Been a while since ive been karting but I wasnt really impressed they felt way too skittish in the game for my liking nothing like when ive driven/ridden a kart in real life