My car suddenly started boosting to 12psi, it was set up completely standard recently on a RR and hasnt been drove much since. it has a chip, -31 was seeing 7psi when it left the RR and has no bleed valve and i have not touched the amal valve, or actuator and it is also piped up standard.

Any suggestions WHY this may be happening?

one thing I can only think of is when i fitted the turbo it had a little piece of mud in the actuator bit where the hose connects, i picke dmost ouf it out and thought nothing more of it as the car ran perfectly, could a little pice of mud block the pipe and make it run 12psi?