| With the stock actuators, you have to crank up the preload on the springs keeping them closed to keep the wastegates closed above 20 psi. With the HKS units, you don't need nearly the amount of preload on the springs to keep them closed above 20 psi, so you have a wider range of adjustability (through your boost controller). They have stronger springs, but also a larger area in the actuator itself so the same pressure (say, 12 psi) can exert a greater force. The strong spring keeps the wastegate closed when 24 psi is trying to push it open, and the larger surface area allows the 12 psi that it "sees" (due to the boost controller stepping down the 24 psi to 12 by the boost controller solenoid) to push open the stronger spring. You can still have the adjustability from a native boost of 12 psi to wide open 25 or 26 psi. You just need a stronger spring to keep it closed. Since you have a stronger spring, you need a larger surface area in the actuator to let that same native boost overcome the spring to open the wastegate. No way in hell do i want my native boost to be 17psi. Does this clear things up a little bit? I can go into more detail if you want me to
Joe
Engine Rebuild in Progress: Sport 530bb's + Inconel :-)
AIM: hoyatiger81
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