How to slow down add torque rotation over time

Hello, i'm starting to make a car game and have the moving and steering worked out. But when I let go of the acceleration key I want the car to gradually slow down.
This is my current script:

Code (JavaScript):

1.  
2. var wheelBL : WheelCollider;
3. var wheelBR : WheelCollider;
4. var wheelTL : WheelCollider;
5. var wheelTR : WheelCollider;
6.  
7. var speed : float = 0;
8. var maxSpeed : float = 10;
9. var turning : float = 5;
10.  
11. function Update ()
12. {
13.     //Move forward
14.     wheelBR.motorTorque = Input.GetAxis("Vertical") * speed;
15.     wheelBL.motorTorque = Input.GetAxis("Vertical") * speed;
16.    
17.     wheelBR.brakeTorque = 0;
18.     wheelBL.brakeTorque = 0;
19.    
20.     //Turn
21.     wheelTL.steerAngle = Input.GetAxis("Horizontal") * turning;
22.     wheelTR.steerAngle = Input.GetAxis("Horizontal") * turning;
23.    
24.     if(speed >= maxSpeed){
25.         speed = maxSpeed;
26.     }
27.     if(speed <= 0){
28.         speed = 0.0000;
29.     }
30.    
31.     if(Input.GetKey(KeyCode.W)){
32.         speed += 5.0 * Time.deltaTime;
33.     }
34.     if(!Input.GetKey(KeyCode.W)){
35.         speed -= 1.0 * Time.deltaTime;
36.     }
37.    
38. }

But when I let go of W the speed variable does go down, but the car still goes at a constant speed.I understand that it may not be the script but the colliders, or it could be the script. If anyone here could help me gradually slow down the car when the acceleration key is not being pressed that would be amazing, thanks!

 

do you have any form of drag setup?

 

I feel dumb now for not looking at that. Thank you very much

 

Here is my drag calculation I created by myself, I hope it will be helpfull:


private Rigidbody thisRigid;
private float startingDrag;

private void Awake(){
thisRigid = transform.GetComponent<Rigidbody>();
startingDrag = thisRigid.drag;
}

private void FixedUpdate()
{
float rigidDrag = thisRigid.drag;
if (engineInput != 0)
rigidDrag -= (actualSpeed / accellerationTime);
else
{
rigidDrag += 0.004f;
Mathf.Clamp(actualSpeed, 0, 100);
rigidDrag = Mathf.Clamp(rigidDrag, 0.001f, 5 / actualSpeed);
}
rigidDrag = Mathf.Clamp(rigidDrag, 0.001f, startingDrag);
thisRigid.drag = rigidDrag;

}

 

lol I just saw this post was made 6 years ago

 

Never too late. Thanks for the help