The friction problem is solved, I made some versions with different frictions in Newton. 0,028 seems good, a difference of 3 km/h at the MCBR. Here is the improved track. http://i1236.photobucket.com/albums/ff442/luukardinho/NoLimiters/Inverted4-130718204517000_zps9a1323f3.png http://i1236.photobuck...