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26th January 2013, 02:08 PM
#1
vnt actuator on turbo charger
just finished fitting my dawes and needle valve and all seems good. when fitting these parts i have noticed that the vnt actuator stop limiting screw on turbo charger appears to have been adjusted without me knowing. there is a white marking pen line down the lenght of the screw which does not line up any more. should i put it on a dyno or leave alone. boost levels and pyro are at safe levels
any advice would be great thanks
3lt GU 111 Wagon 2 inch lift,3in Taipan exhaust, cross country intercooler,catch can,EGR blocked, dawes and needle valve,Pyro/boost gauge ARB lockers,steinbaurer chip, long range tank, s/s water tank, draws, warn winch, and other stuff.
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26th January 2013 02:08 PM
# ADS
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26th January 2013, 02:24 PM
#2
Patrol God
Needle valve adjustment is look at the turbo,with needle valve closed ,start motor and open needle valve.
As soon as acuator moves lock off needle valve , 2000rpm = 10 psi, Chaz yellowfoot has great thread on this subject {archives}
Getting it dynoed is not going to hurt just fine tuning, highly recommend
04 ST 3lt auto, not enough Mods to keep me happy, but getting there
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26th January 2013, 02:56 PM
#3
i have set dawes /needle valve by chaz thread. what are they tuning? are they adjusting the variable nozzle actuator ? i did not think there is much to tune on the 3 litre
3lt GU 111 Wagon 2 inch lift,3in Taipan exhaust, cross country intercooler,catch can,EGR blocked, dawes and needle valve,Pyro/boost gauge ARB lockers,steinbaurer chip, long range tank, s/s water tank, draws, warn winch, and other stuff.
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26th January 2013, 04:03 PM
#4
Expert
Its adjusting the spool rate of the turbo mate
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26th January 2013, 04:23 PM
#5
So are you saying that, the needle valve overides the VNT actuator, even if has been tampered with
3lt GU 111 Wagon 2 inch lift,3in Taipan exhaust, cross country intercooler,catch can,EGR blocked, dawes and needle valve,Pyro/boost gauge ARB lockers,steinbaurer chip, long range tank, s/s water tank, draws, warn winch, and other stuff.
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26th January 2013, 06:16 PM
#6
Patrol God
Needle valve should control the boost and it's levels. Adjusting the vnt screw will help it boost sooner or later depending on which way it's been adjusted.
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26th January 2013, 06:33 PM
#7
Patrol God
Agree with you not much you can do with the ZD30 but a dyno will get the most with what you have
04 ST 3lt auto, not enough Mods to keep me happy, but getting there
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26th January 2013, 06:37 PM
#8
I am he, fear me
Originally Posted by
june
So are you saying that, the needle valve overides the VNT actuator, even if has been tampered with
The dawes valve controls the boost
The VNT adjustment controls the spool up rate
The needle valve when adjusted correctly takes over control the spool up rate making it more linear BUT can only make it slower than what the VNT adjustment will allow IF max boost is demanded.
IE, you have taken ECU boost control away and have 3 manual adjustments
If your max boost pressure is to low or high adjust the dawes
If your boost is spiking or coming on too quickly adjust your needle valve
Your maximum (fastest) spool up is controlled by the VNT adjustment which ports more or less ehaust gas into the turbo. IF that has not been adjusted from factory you shouldn't need to touch it
Dolphins are so smart that within a few weeks of captivity, they can train people to stand on the very edge of the pool and throw them fish.
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27th January 2013, 10:31 AM
#9
thanks guys. the only other thing that i am not sure of is how do you know what is a slow or fast spool up rate? i would think your needle on your boost gauge should rise smoothly not to slow and not too quick. is this correct?
3lt GU 111 Wagon 2 inch lift,3in Taipan exhaust, cross country intercooler,catch can,EGR blocked, dawes and needle valve,Pyro/boost gauge ARB lockers,steinbaurer chip, long range tank, s/s water tank, draws, warn winch, and other stuff.
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28th January 2013, 10:29 AM
#10
Originally Posted by
june
thanks guys. the only other thing that i am not sure of is how do you know what is a slow or fast spool up rate? i would think your needle on your boost gauge should rise smoothly not to slow and not too quick. is this correct?
ANYBODY please ?
3lt GU 111 Wagon 2 inch lift,3in Taipan exhaust, cross country intercooler,catch can,EGR blocked, dawes and needle valve,Pyro/boost gauge ARB lockers,steinbaurer chip, long range tank, s/s water tank, draws, warn winch, and other stuff.
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