How to make a turbo start in GTA V on PS4?

I have been trying to get a turbo start in Gta 5 online for a long time, unfortunately I do not know how to do it or which race I have to drive;

Can someone please help me there?

You can do that in every race. You wait an ach until the countdown has run down and only press r2 fully when it starts

Must start exactly when the countdown has run down and the "Go!" Signal (does that mean?) Comes. So: "3, 2, 1, go!" at "Go!" you have to go full throttle with R2 and then the post goes off