Lifting car

Hello, i have a problem that my car is “lifting” when i go. Below is animated gif. And my car has 1500 mass in rigidbody. I make very basic controller of my car there is my code:

using UnityEngine;
using System.Collections;



public class Ovladanie : MonoBehaviour {
	
	public WheelCollider WPL;
	public WheelCollider WPP;
	public WheelCollider WZP;
	public WheelCollider WZL;
	
	int rychlost = 50;

	// Use this for initialization
	void Start () {
		Vector3 centerOfMass = rigidbody.centerOfMass;
		centerOfMass.y = -0.9f;
	}
	
	// Update is called once per frame
	void FixedUpdate () {
		WZL.motorTorque = rychlost * Input.GetAxis("Vertical");
		WZP.motorTorque = rychlost * Input.GetAxis("Vertical");
		
		WPL.steerAngle = 10 * Input.GetAxis("Horizontal");
		WPP.steerAngle = 10 * Input.GetAxis("Horizontal");
	}
}

GIF: Animated GIF - Imgflip

Thank you for help and sorry for my english

The lift is a natural consequence of the amount of toque you are applying to the rear wheels. I suspect you are just adding too much torque for your vehicles configuration. If you need that much torque to operate your vehicle correctly (to get enough acceleration etc) then look at suspension stiffness, vehicle weight distribution (if supported by Unity car physics or your own system), adding downforce to the front of the car etc. Also double check your scale… make sure the car is of real world proportions otherwise physics can seem to act too slow/weak or fast/powerful.

I personally haven’t used Unity’s wheel colliders and car setup before so this is probably as much as I can help you.