Physics is always good, but I somewhat expected more. Can someone post an SVN link to the part of the sources where the equations of motion are actually iterated? This may be quite informative from a physics point of view, also regarding the kart characteristics, like engine power.
We do not manually use equations, we use the bullet physics engine. karts/moveable.*, karts/kart.*, physics/btKart.*, physics/physics.* are some of the files where we interface with bullet
Thanks for the constructive answer to an admittedly pointless question I find it fascinating to see how complex the actual game mechanics are if for example one takes a look at the sources of physics/btKart.cpp.