there have been changes and I think that they are bad for the game because turbo's are rendered useless atm and tracks make everything slower and electromotors became better but they where overpowered already and now half of my vechicles don't even get to their speed anymore yet with tracks do 1/3 of the speed things with turbo do 1/3 1/2 3/4 depends of how much the turbo has effect.