vnt mechanism

how is the best way of testing this? should the arm move when u blip the power ? the reason i ask is the td4 still seems down on power under 2000rpm even with the synergy 2a+ and pierburgh fitted boost solanoid ?

mark

Ok so it moves but only about 3/4 mm at the most anyone?

Ok so it moves but only about 3/4 mm at the most

Click to expand...

*mine produces 17psi ( map ) @ 3k rpm when in neutral .. i.e. no load on the engine ..
i hardly expect that watching the actuator arm in those circumstances would be informative
as to diagnose engine / turbo performance when driving ..
e.g. i've seen mine @ 23psi @ 1750 rpm (aprox) when climbing a hill on partial go-pedal ..
.. have seen it @ 28 psi @ aprox 3k rpm with go-pedal near the floor ..

( it's @ 14 psi normaly at idle .. that's regular air pressure at sea level ..
( that obviously drops at altitude ..

* via 'scangaugeII'

all in all actuator movement is relatively small
actuator - YouTube
yes .. it's not a turbo actuator diaphram from a hippo1 ..
but it will be similar ..

one off a vw .. movement ain't much between fully closed & fully open vanes ..
http://www.youtube.com/watch?NR=1&feature=endscreen&v=Qu0UGKS7-JQ

a bit of gear would be needed to test it ..
Real-Life Diagnostics: Variable Nozzle Turbine Pressure Control

as for how much the freelander's actuator arm moves when the engine is under load ..
or is supposed to move .. according to specs. ..
is info i have so far failed to find via the internet ..

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so your'e hippo is down on low rpm power ..
compared to ?? when ..
symptom is .. not pulling ??? .. reluctance to accelerate ??

I would say it moves around 10mm. You should be able to move it up and down with your finger relatively easily.

An alternative method is safely jack the car etc and set it at idle, then take the feed pipe off the valve that supplies the vnt mechanism and put it on the vnt inlet and the valve should fully open, remove and should fully close.