omega0684
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| posted on 25/3/09 at 04:02 PM |
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turbo actuator
a mate of mine thinks his turbo needs replacing on his astra coupe and says that he needs to replace the 'actuator'. what is the actuator
and what does it do?
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BenB
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| posted on 25/3/09 at 04:09 PM |
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Some turbos have a built in wastegate. The actuator controls the wastegate IE they're used to mean the same thing.
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Gav
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| posted on 25/3/09 at 04:12 PM |
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The actuator is controlled by the ECU isnt it, to limit boost rather than a mechanical wastegate system?
Common problem with the VAG 1.8T engine was the actuator sticking open causing no boost.
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omega0684
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| posted on 25/3/09 at 04:25 PM |
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from what i understand the actuator controls the watsegate to allow exhaust gases to bypass the turbo to prevent over spinning of the turbo?
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Gav
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| posted on 25/3/09 at 04:43 PM |
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Yes thats what i meant 
It just allows the ECU to control it rather than having the wastegate set to open on certain pressure
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CraigJ
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| posted on 25/3/09 at 05:09 PM |
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All it does is control the boost pressure, the actuator is just a spring really. the spring is rated at a certain pressure and when the turbo reaches
that pressure the waste gate opens and lets out and excess pressure.
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Antnicuk
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| posted on 25/3/09 at 08:04 PM |
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quote:
Originally posted by CraigJ
All it does is control the boost pressure, the actuator is just a spring really. the spring is rated at a certain pressure and when the turbo reaches
that pressure the waste gate opens and lets out and excess pressure.
^^^^^ spot on, no electronics in an actuator at all, it has a diaphram behind the spring so air pressure moves a bar connected to the wastegate.
Most modern cars use an electronic solenoid in the boost hose that feeds the actuator so that the ecu can increase the boost if it needs to.
[Edited on 25-3-09 by Antnicuk]
600 BHP per ton, Stylus Brought back from the dead! Turbo Rotary Powered!
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