Well it's a new fully rebuilt turbo motor, new coolant, all new parts, davies craig digital fan controller which works well.
Radiator is 6 months old, engine is 8.4:1 compression and running rich with 80lb injectors.
The system holds pressure with a radiator pressure tester but only tried it for half an hour.
This is the second thermostat ive tried with the same problem, car is fine for half an hour then starts heading for the 3/4 mark. The cooling pipes to the turbo make gurgling noises when the cars turned off.
Had the head checked and its not leaking. Got me stuffed lol