Standing Dunk. How?

How to do standing dunk guys? I've tried many times but they will just do a lay up through the basket or just a simple hook shot. Thanks..

Hold the turbo button while pressing the shoot button or moving the right stick towards the basket?
Do consider that if a player's standing dunk rating is low, he can't do a standing dunk and will just layup or hook shot the ball.

Well don't know what i'm doing wrong but i can't perfoorm any Standing Dunk. Tried with almost all the Guys. Brook Lopez, Dwight Howard. Boozer etc They just make a lay-up.

Well don't know what i'm doing wrong but i can't perfoorm any Standing Dunk. Tried with almost all the Guys. Brook Lopez, Dwight Howard. Boozer etc They just make a lay-up.

Hold your turbo key (mine is NUM PAD 7) then tap any shot stick (up,down,left,right) towards to the basket..

Just hold Turbo + right analog stick forward

Must be your sliders. I tried a slider set with supposedly "realistic" stats. Can't do dunks for shit. Standing dunks or even running dunks with high rated players. Try increasing your dunks in traffic or something.