Id say 90 percent of your problems are a blocked oil return, or blocked feed line. These lines should always be replaced when replacing a turbo.
These things run regularly at 15 psi boost, id be looking at the vane control solenoid first if its over boosting, along with a blocked line to the pressure sensor or a faulty sensor.
Boost control regulator is only one part of the entire boost control system, boost is actually controlled via the variable vanes in the turbo. Correct setup of these when refitting the turbo is paramount.

 

Befor i fitted all turbos i did not change the lines but did remove an clean propaly and also wound over moter befor fitting turbos pumping oil out of lines and followed by full service oil and filter change.

 

Did you pressure test the return line and feed line? Flowing out the feed line is fine, but you really need to prove its flow is adequate and that the return line and fitting in the sump isn't obstructed. Any obstruction in the return line fitting will reduce flow
About the only thing that kills turbo is low oil flow or overheating.

Since you haven't replaced the lines, they are top of my suspect list. Attach a funnel to the return line and fill it with oil, how fast does it disappear under gravity?

 

Dose any 1 no what the oil flow rate is and the preasuer from winding over not running at befor the turbo and arfter it has pased threw the turbo and coming out the oil return line as im measuring it befor ir hits the turbo and arfter from drain line ? Suzu gv 2007 08 realise 1.9td f9q reno bucket of lol.