At that time, I was using a T64E p-trim turbo with a .63 A/R exhaust housing, 3" THDP with the stock style "flapper" valve, and a homemade dual port actuator with about 8lb. of spring pressure. This was my old stock block combo.
The C02 was supplied through a Biondo preset regulator at 80 psi. The 1st stage of the controller was set at 10psi which resulted in about 16lb of launch boost. The second stage of the controller was set at 34psi resulting in my 27 psi of boost. As you can see, in this case, boost did not go up one for one with the controller setting.
I have sinced switched a 274 stage 2 with a 76GTS turbo using a .96 A/R exhaust housing, Tial V44 gate, and a .2 bar (2.9lb.) spring. The CO2 supply is the same 80 psi.
With 4 psi on the first stage, I have 7lb. of boost. With 21 psi on the second stage, I have 23lb. of boost. I currently have the ramp rate set at 30psi/ second and it results in no spike.
I only have 9 passes on the current set up so far but I am very happy with how the controller is working.