If you want to test a far better arrangement leaving behind the limitations you just mentioned try this :Thank you for bringing another interesting mod I would not have conceived of off my own bat!
At present I'm relatively happy with my dawes/needle setup compared to what it was like standard.
However, the thing that niggles me is the compromise between having a descent spoolup for driving and having to live with cruising at high boost.
What I've noticed is sustained high boost on cruise is both not needed and sky rockets the intake air temp. Its amazing how quick intake temps come down with a slow spool but then you loose driving response...
This mod I think will keep driving response with fast spool and enable intake temps to drop between duty cycles.
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1/ PUT A NEEDLE BEHIND THE DAWES ( ie in serie with). MAKE THE DAWES TO OPEN MUCH MUCH EARLIER ( ie unscrew it almost to max, so that it opens as soon as some positive pressure is seen by the dawes ).
2/ SET THIS SECOND NEEDLE in such a way that you reduce the quantity of positive flow being injected into the vaccum hose of the actuator.
3/ DON'T FORGET to set again your first needle as you wish your spool-up to be.
This will make sure the vanes open continuously whilst RPM goes up, and wil get your VNT to work as it should, and not transformed into a stupid two-stage turbo.
Try and find the best arrangement to suit your driving and until you get a continuous rise of boost with RPMs.
Check the MAF value, as only FLOW matters, not boost !!! High pressure & little flow (MAF tension) means higgh back pressure and little efficiency. Smaller pressure and high MAF tension means high flow of air and fuel injected, and therefore POWER.
Your Patrol will run like never before. Believe me.
I have now thrown away my digibooster, and using my Patrol (2000) MAP to regulate the VNT with my own electronics, which allows me to get what I want when I want it.
But the three valves arrangement is the best and cheapest arrangement you can get. It mimics what an ECU would do quite accurately. And works beautifully once you have understood what you do with the valves.
Watch the limp modes though. If the flow of air you get is too high, MAF will be too high, and unless you control/reduce the MAF tension, you'll get limp modes if you push the flow too high. (note : the FLOW, not the boost).