unity wheel collider settings

Hello everybody,

So I am a student working on my second concept game. I have a car downloaded from assets store, blue BMW with wheels and brakes as separated objects on the prefab and I want to move the car and the wheels with the wheel colliders. I followed a tutorial on youtube and everything is fine but the car is really slow like a snail. I set the motor force to a high number for testing to 150000 and still like a snail. the mass of the rigidbody on the car is 1750. I do not know how to set up the mass and other settings for the wheel colliders. I have pictures of the settings I am using. Can anybody help me understand where the issue is or am I missing some settings? Other thing: does anybody know how to set up the wheel colliders' spring and friction settings? Thank you very much

pictures:

https://ibb.co/Yyg8z1b

https://ibb.co/5Kh4vK1

code I am using:

 using System;
 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class CarController : MonoBehaviour
 {
     private const string HORIZONTAL = "Horizontal";
     private const string VERTICAL = "Vertical";
 
     private float horizontalInput;
     private float verticalInput;
     private float carSpeed = 150f;
 
     private float currentSteerAngle;
 
     [SerializeField] private float motorForce;
 
     [SerializeField] private float maxSteeringAngle;
 
     [SerializeField] private WheelCollider frontLeftWheelCollider;
     [SerializeField] private WheelCollider frontRightWheelCollider;
     [SerializeField] private WheelCollider rearLeftWheelCollider;
     [SerializeField] private WheelCollider rearRightWheelCollider;
 
     [SerializeField] private Transform frontLeftWheelTransform;
     [SerializeField] private Transform frontRightWheelTransform;
     [SerializeField] private Transform rearLeftWheelTransform;
     [SerializeField] private Transform rearRightWheelTransform;
 
     
 
     private void FixedUpdate()
     {
         
         GetInput();
         HandleMotor();
         HandleSteering();
         UpdateWheels();
     }
 
     private void UpdateWheels()
     {
         UpdateSingleWheel(frontLeftWheelCollider, frontLeftWheelTransform);
         UpdateSingleWheel(frontRightWheelCollider, frontRightWheelTransform);
         UpdateSingleWheel(rearLeftWheelCollider, rearLeftWheelTransform);
         UpdateSingleWheel(rearRightWheelCollider, rearRightWheelTransform);
 
     }
 
     private void UpdateSingleWheel(WheelCollider wheelCollider, Transform wheelTransform)
     {
         Vector3 pos;
         Quaternion rot;
 
         wheelCollider.ConfigureVehicleSubsteps(400f, 5, 2);
         wheelCollider.GetWorldPose(out pos, out rot);
         wheelTransform.rotation = rot;
         wheelTransform.position = pos;
     }
 
     private void HandleSteering()
     {
         currentSteerAngle = maxSteeringAngle * horizontalInput;
         frontLeftWheelCollider.steerAngle = currentSteerAngle;
         frontRightWheelCollider.steerAngle = currentSteerAngle;
 
     }
 
     private void HandleMotor()
     {
         frontLeftWheelCollider.motorTorque = verticalInput * motorForce;
         frontRightWheelCollider.motorTorque = verticalInput * motorForce;
     }
 
     private void GetInput()
     {
         horizontalInput = Input.GetAxis("HORIZONTAL");
         verticalInput = Input.GetAxis("VERTICAL");
     }
 }