Will - as you know, that turbo was sent off to be checked and was given a clean bill of health by the manufacturer. So it wasnt the turbo that meant it wouldnt hold the boost. It was either something to do with the engine or the boost control system.

Feel free to reply, but I'm not going to You go with what you think and I'll go with what other people know from experience.

Have a nice day

p.s good luck with the rest of your project