Well cars come back seems like the problem was the whole combination of turbo mani and downpipe all being so close to the rad and the turbo being water cooled. It was just superheating everything and it couldn't cool it down ! Had a new downpipe made and just waiting to get new rad setup in (triple core half rad ) and removed water lines to turbo, then going to have it mapped again as pretty sure the old downpipe was leaking like a siv !