With today's wildly varying engine/turbo/wastegate combinations, asking a exact boost result on a given springs is a loaded question.

Turbine size, compressor size, fuel type, cubic inch, Head air flow efficiency, turbine pressure required, cam shaft overlap, wastegate position... The list goes on. Till this all comes together what boost will be produced is one of the worlds greatest mysteries.

A wastegate isn't an intelligent device- give it X boost pressure, Y Turbine Pressure, Z spring pressure and you will get a certain amount of valve flow. What that does to the rest of the picture is a huge ? that only experience can predict.

With that said we do offer some ideal numbers on our spring sections. All figures are with compressor pressure connected to the lift port and are in PSI.

JGS400 40mm gates

   S1 Std.(Red - Installed) S2 medium (Black)  S3 (natural)
 TK188(R) 6-7  8-10 14-16
TK188V(R)  5-6 7-9 13-15

JGS500 50mm gates

   S1 Std.(Red - Installed) S2 medium (Black)  S3 (natural)  HS (TK188-S3)*
 TK260 5-6  7-9 13-15  13-15
TK260R  4-5 6-7 12-13 12-13 (HS Kit Reguired)

JGS600 60mm gate

   S1 Std.(Red - Installed) S2 medium (Black)  S3 (natural)  HS (TK188-S3) *
 TK260 3-4  5-6 11-12  11-12

*The HS / HS kit can be combined with S1-S3 springs.

Basic rules of thumb (subject to significant error but still useful)-

-Basic Boost control usually doubles the base boost value

-Using pressure in the control port WITHOUT pressure in the lift port will start at the highest basic boost control number then build more as pressure to the control port is increased. "Pressure over the top" nets the widest boost control range and works great with our actuator design.