Turning Rigid body currently in contact with ground.

Hi all.

Am making a racing car game. Micro Machines style!

I've got the car moving forward and backwards using the rigid body commands in the fixed update function (JS). However I can't seem to get the vehicle to rotate. I'm sure its quite simple, any ideas?

here is current controller code:

 #pragma strict
 
 var handling : float = 100.0;
 var speed : int = 100;
 
 function Update () {
 
     
 }
 
 function FixedUpdate () {
 
     var rightTurn : Quaternion = Quaternion.Euler(0,handling,0);
     var leftTurn : Quaternion = Quaternion.Euler(handling-(handling*2),0,0);
     
     if(Input.GetKey("right")){
         
         rigidbody.MoveRotation(rigidbody.rotation * rightTurn);
         
     };
     if(Input.GetKey("left")){
     
         rigidbody.MoveRotation(rigidbody.rotation * leftTurn);
     
     };
     if(Input.GetKey("up")){
     
         rigidbody.AddRelativeForce(speed,0,0);
     };
     if(Input.GetKey("down")){
     
         rigidbody.AddRelativeForce(speed-(speed*2),0,0);
     };
 
 
 }

The problem is it moves really slowly, almost like the friction is stopping it. Any ideas?