Marco:

thanks for replaying
about the tourqe thats the all deal, if you add more tourqe the car will be faster if you decrease the tourqe the car will be slower...
in real life there is indirect connection between engine RPM to the wheel RPM...
first gear is more power less speed
and 5th gear is less power more speed.

using the physics engine its direct connection
1st gear less power less speed
5th gear more power more speed....

about the velocity thing....
i thought about it but this is my last choise...