I have just been speaking to a company who done my frame and they said that a lot of problems with the C20LET when running high boost is the heat caused by the turbo manifold. Look at the picture above to see what they mean. Maybe this is why water injection makes such a difference when running phase 3.
Another thing I was wondering is. Has anyone ever kept a look at the timng on a phase 3 when on a rolling road with and without water injection and compared power outputs.