Ive had my Greddy Type-s for awhile now, It came with the car. My question is the nut on the top to adjust the spring stiffness. I loosen the nut on top but the screw itself does nothing. all that seems to happen is the nut just goes up and down the screw. but the screw itself does not move. no change at all. Is mine broken? or im i doing something wrong. I think that my BOV might not be set at the prime level for the boost that im running. Any help on this subject would be great. Thanks

 

After you loosen the nut, you need an Allen wrench to screw down or up for adjustment. The nut is to lock the setting. It nothing to do with stiffness.

 

DO NOT try to turn the set screw without first loosening the jam nut. Trying to do so will strip the threads from the aluminum cap and the set screw will shoot out the top of the BOV! Amazingly, I used to see this happen 2 or 3 times a year on customer cars.