hello my tt system is almost complete on my silverado ss 6.0L my question is i know it has a set screw on the top for setting how it blows off. can someone tell me how to set it?? i want it to blow off as soon as i let off..the instructions that came with it dont tell anything except where to place it.. also i am running 6psi for now.. not sure but i couldnt get it to blow off tonigh but tonight is the first i started it with the tune on it.. its going to get exhaust finished tommorow.. maybe it isnt blowing off because it is open turbo at this time? or maybe because i only ran it up to about 3-4psi.. not sure if someone can help that would be great thanks