Dawes and Needle Valve?

[the evil twin]

Some word terminoligy differences here . Actuator adjustment shaft is my description of it , but the grub screw would be the limit adjust . This is how I have understood and answered it , so my blew if this is wrong .

I could be wrong too, Cobber, but thats my understanding of it all. AFAIK the boost pressure is controlled electro-pneumatically from the ECU sensing the pressure at the intercooler and porting the boost solenoid whne max boost is sensed. Trying to control spool the same way would be doable but more difficult.

I still haven't got my head around that "other" shaft on the Turbo and adjustment beside the VNT... the one with the flat plate either side of the threaded shaft but everything I have researched says "whatever you do don't fiddle with it"... I sure don't have the guts to do it... ROFLMAO

Bottom line is I guess... pre CRD do both (Dawes and Needle) post CRD try a tweak on the VNT if it doesn't work or if you want to go fully manual anyway then, again, do both.

P.S. ... I think its a bit like flying a chopper... anything you do affects everything else anyway