ive only owned my 88 rs turbo for about 4 months so im still new to the scene. when i bought my rs it woz running 16 psi an pulled really well. then one day i went out in it an it woz on running 6 psi and hasnt changed ever since. the only thing that has changed is i have fitted is a oil seperator tank. has anyone got any ideas?

 

amal valve (bypass it)

 

thanks. how do i do that?