Originally Posted by tabetha
-34 can hold shut against more boost, than a -31 as already said, has a stronger spring and can take more preload.
tabetha
Thats how i thought it worked
i think you could use a -31 but the preload would too much and not the correct application...i just bought a -34 as my -31 would not hold the wastegate to my required boost level...i fitted a -34 and preloaded it to hold 31 psi,worked out at half a hole on my -34,but when i preloaded my -31 to half a hole it only held 22 psi.
mark