fse

hi all!!! i'm having a C280 1994 and i've got a FSE power boost valve. wanna try but i don't know how much "bar" i need to set for this stuff. i know the original fuel pressure regulator was set at 3.8 bar max. and it will drop 0.5 bar at idling. so... i should set the FSE at 3.3 bar or any...