AddRelativeTorque on different platforms

Please bare with me I'm new to Unity! The following code works nicely in the player, but when I run it on an iPhone the torque is much greater than I would expect. I'm using Time.deltaTime so what am I missing? The intent is to move the car forwards at a max speed, and to allow A/D or left tap/right tap to add torque and turn.

Code (CSharp):

1. private void Update()
2.     {
3.         if (IsGrounded())
4.         {
5.             playerRb.AddRelativeForce(Vector3.forward * accel * Time.deltaTime, ForceMode.VelocityChange);
6.             if (playerRb.velocity.magnitude > maxSpeed)
7.             {
8.                 playerRb.velocity = playerRb.velocity.normalized * maxSpeed;
9.             }
10.             // Player Controls
11.             // Rotate us left
12.             if (Input.GetKeyDown(KeyCode.A))
13.             {
14.                 playerRb.AddRelativeTorque(-Vector3.up * rotationFactor * Time.deltaTime, ForceMode.Acceleration);
15.             }
16.  
17.             // Rotate us right
18.             if (Input.GetKeyDown(KeyCode.D))
19.             {
20.                 playerRb.AddRelativeTorque(Vector3.up * rotationFactor * Time.deltaTime, ForceMode.Acceleration);
21.             }
22.  
23.             // Phone Controls
24.             if (Input.touches.Length > 0)
25.             {
26.                 // Left tap
27.                 if(Input.touches[0].position.x < Screen.width / 2 )
28.                 {
29.                     playerRb.AddRelativeTorque(-Vector3.up * rotationFactor * Time.deltaTime, ForceMode.Acceleration);
30.                 } else
31.                 {
32.                     playerRb.AddRelativeTorque(Vector3.up * rotationFactor * Time.deltaTime, ForceMode.Acceleration);
33.                 }
34.             }
35.         }
36.     }

 

Bunch of things:

- Gather all the input in Update() as you are doing, but store it to temporary variables. Do not act on it yet.

- Do all physics force and torque adds in FixedUpdate() based on the temporary variables you set above

- Do not use Time.deltaTime at all. Just apply the force/torque when you want it. Unity will slice it according to how much time has gone by, which will be a constant slice in FixedUpdate()

 

Thanks Kurt that helped a lot.