Well thats blown it, I was racing yesterday when the pipe to the boost controler came off so max boost and no fuel cut. Melted 2 plugs and munched some valves just in the middle of getting the head off to see the damage and start saving.
Well the turbo seems OK but some of the valves are broken and a piston crown is damaged as is the bore so the blocks coming out for a clean up think I will rebuild with Nissan cermic top pistons