Hello i need some help please. I have just bought another escort rs turbo that has been fully rebuild but not finished,The cozzy actuator fitted was screwd fully out holding the westgate open so i just stuk on a standerd rs one just now.So i set her to half holl pretention and now she is boosting but what is a safe psi The engine is a 1.8 zvh mfi,piper cam,pully,chipped ecu ,k n,full 3 inch bore from turbo back but i dont no how the conversion was done/decom,plate or pistons skimmed or forged .Is their a way to find out with out taking the head of how she has been done and is their a way to check the compression ratio also i dont no what garret turbo i have as it only has airesearch on the front and no numbers. any help would be much appreciated thanks