Getting custom wheels working on a vehicle

// Setup the car with some tires & springs
   for (%i = %obj.getWheelCount() - 1; %i >= 0; %i--)
   {
      %obj.setWheelTire(%i, DefaultCarTire);
      %obj.setWheelSpring(%i, DefaultCarSpring);
      %obj.setWheelPowered(%i, false);
   }

datablock WheeledVehicleTire(CarTire)
{
   // Tires act as springs and generate lateral and longitudinal
   // forces to move the vehicle. These distortion/spring forces
   // are what convert wheel angular velocity into forces that
   // act on the rigid body.
   shapeFile = "art/shapes/Car/Wheel.dae";
   staticFriction = 4.2;
   kineticFriction = "1";

   // Spring that generates lateral tire forces
   lateralForce = 18000;
   lateralDamping = 6000;
   lateralRelaxation = 1;

   // Spring that generates longitudinal tire forces
   longitudinalForce = 18000;
   longitudinalDamping = 4000;
   longitudinalRelaxation = 1;
   radius = "0.609998";
};


datablock WheeledVehicleSpring(CarSpring)
{
   // Wheel suspension properties
   length = 1.5;             // Suspension travel
   force = 2800; // was 2800             // Spring force
   damping = 3600;             // Spring damping
   antiSwayForce = 3;         // Lateral anti-sway force
};

datablock WheeledVehicleData(Car)
{
   category = "Vehicles";
   shapeFile = "art/shapes/Car/Car.DAE";
   emap = 1;

   mountPose[0] = sitting;
   numMountPoints = 1;

   useEyePoint = false;  // Use the vehicle's camera node rather than the player's

   maxSteeringAngle = 0.585;  // Maximum steering angle, should match animation

   // 3rd person camera settings
   cameraRoll = false;        // Roll the camera with the vehicle
   cameraMaxDist = 20;       // Far distance from vehicle
   cameraOffset = 3.0;        // Vertical offset from camera mount point
   cameraLag = "0.3";           // Velocity lag of camera
   cameraDecay = 1.25;        // Decay per sec. rate of velocity lag

   // Rigid Body
   mass = "400";
   massCenter = "0 0.5 0";    // Center of mass for rigid body
   massBox = "0 0 0";         // Size of box used for moment of inertia,
                              // if zero it defaults to object bounding box
   drag = 0.6;                // Drag coefficient
   bodyFriction = 0.6;
   bodyRestitution = 0.4;
   minImpactSpeed = 5;        // Impacts over this invoke the script callback
   softImpactSpeed = 5;       // Play SoftImpact Sound
   hardImpactSpeed = 15;      // Play HardImpact Sound
   integration = 8;           // Physics integration: TickSec/Rate
   collisionTol = "0.1";        // Collision distance tolerance
   contactTol = "0.4";          // Contact velocity tolerance

   // Engine
   engineTorque = 4300;       // Engine power
   engineBrake = "5000";         // Braking when throttle is 0
   brakeTorque = "10000";        // When brakes are applied
   maxWheelSpeed = 50;        // Engine scale by current speed / max speed

   // Energy
   maxEnergy = 100;
   jetForce = 3000;
   minJetEnergy = 30;
   jetEnergyDrain = 2;

   // Sounds
   engineSound = cheetahEngine;
   //squealSound = cheetahSqueal;
   softImpactSound = softImpact;
   hardImpactSound = hardImpact;

   // Dynamic fields accessed via script
   nameTag = 'Car';
   maxDismountSpeed = 10;
   maxMountSpeed = 5;
   mountPose0 = "sitting";
   tireEmitter = "CarTireEmitter";
   dustEmitter = "CarTireEmitter";
   dustHeight = "1";


};

function Car::onAdd(%this, %obj)
{
   Parent::onAdd(%this, %obj);

   %obj.setWheelTire(0,CarTire);
   %obj.setWheelTire(1,CarTire);
   %obj.setWheelTire(2,CarTire);
   %obj.setWheelTire(3,CarTire);

   // Setup the car with some tires & springs
   for (%i = %obj.getWheelCount() - 1; %i >= 0; %i--)
   {
      %obj.setWheelPowered(%i, true);
      %obj.setWheelSpring(%i, CarSpring);
   }

   // Steer with the front tires
   %obj.setWheelSteering(0, 1);
   %obj.setWheelSteering(1, 1);

}

function Car::onRemove(%this, %obj)
{
   Parent::onRemove(%this, %obj);
}