D12A 420 low output

Hi.

I have a d12a enginge with 420hp.
The engine start and run very well. No smoke, no misfiering, no bad noices,no fault codes. But also no turbopressure.

The turbo has been taken out an checked. The pressure side from turbo to inletmanifoild has been pressedurised and checked for leaks. All the enginesensors have been repalced. The wiringharnes thruout the egine has been messured and checked. The ecu has beed replaced with a newly programed ecu.

The volvo dealer has beed checking with the original foultcode system. No foult found.

New pipline for diesel.New filters all over.

Dieselpressure checked in at 3.5 bar on full load at 1000 rpm.

4.5 bar on full load 1500 rpm.

In the green range from 1000 to 1700 rpm the engine deliver around a quarter of the turboboost. Have no numbers from the mesuring....

Can anyone help me? This start to get out of my understandment.