How do i get rid of touch lag between touch ending on device and action in game? Or is it possible, on Unity Remote 4 using Nexus 7 2012 with if (Input.touchCount > 0) for touch input?

Having struggled with touch input in games and testing games on an android device i have been using using unity remote 4 on a Nexus 7 2012 (1st Gen) and to master touch input i have been using
if (Input.touchCount > 0) on a UI Button which seems to solve my problem as whenever i touch the screen Input.touchCount equals 1 and that works, my code is below;

public class Left : MonoBehaviour {
    GameObject car;
    int speed = 100;

	// Use this for initialization
	void Start ()
       car = GameObject.Find("Car");

    // Update is called once per frame
    void Update()
        if (Input.touchCount > 0)
            car.transform.Rotate(Vector3.up * Time.deltaTime * speed);

It is very simple code which is easy for me than confusing event managers or other ways to do touch input. But the problem is when I release touch on the button which this code is attached to, both the car rotation and debug logging of “LEFT” continues for a short period, at least one second which could be catastrophic for me when i create simple games focused on reaction.

Thank you for reading my question, I would hope their is a solution to avoid the lag or I can blame it on my old device and unity remote, meaning it would work if i actually released it. Opinions or answers would be much thanked!

[I later discovered] Unity Remote 4 will never be perfect as it is not the app itself, hence the code doesn’t matter. In order to test an app i recommend building an apk of your app, placing it on your mobile device, and then, by use of a file explorer app, opening and installing it manually for no lag (unless of course the code is very demanding).