the number 6 plate was a poor match w/ the 4k GSK... it would make about 35psi till about 2600-2700rpm, and then it would make 42psi (wastegate blocked off)
that's w/ the plate slid full forward
I yanked it out and ground it down so that the deepest point is now a hair deeper than the deepest point on the 6 plate.
I installed it just the slightest bit back from full forward.
it made 45psi from about 2100 up!
I also slid the AFC housing forward (it was dead center) AFC wheel has always been full forward.
needless to say when I lay into it, it's a smokey *******!
I set the wastegate right at 40psi... LOT more smoke now at full boost than I ever had before, and EGT's climb quicker, but not so quick that I can't have fun w/ it!
Forrest
that's w/ the plate slid full forward
I yanked it out and ground it down so that the deepest point is now a hair deeper than the deepest point on the 6 plate.
I installed it just the slightest bit back from full forward.
it made 45psi from about 2100 up!

I also slid the AFC housing forward (it was dead center) AFC wheel has always been full forward.
needless to say when I lay into it, it's a smokey *******!
I set the wastegate right at 40psi... LOT more smoke now at full boost than I ever had before, and EGT's climb quicker, but not so quick that I can't have fun w/ it!

Forrest