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Graeme Shaw wrote:Hi all,
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I have an apexi avcr fitted, and am running 1.1bar of boost.
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However this time of year it is set to off, which i presume means that the solenoid is constantly open between the turbo and the actuator.
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However i still over boost, hitting over 1.1 bar if i aint carefull as the revs rise.
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How can this be if the pressurised air is escaping?, even before it gets to the actuator?
I do have a stage 3 hybrid turbo, but cant see how that can make any difference if all the air is escaping?
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Do i need a new actuator?
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Cheers Graeme
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Graeme,
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As Chris says, take the AVCR's solenoid out of the loop.
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An easy way to do this is get a vacuum hose and connect it from the turbo's compressor cover to the actuator directly.
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With it like this, you should only boost to the level set by the actuator.
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Hybrid turbos may boost higher though at high RPM.
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A downpipe that doesn't allow the wastegate to fully open will also cause overboost, and it would seem that this is what the HSR one suffers from.
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Does your actuator have 1 or 2 ports? If you've got 2 ports, this is like the standard one, and what you'd need to do is block one of them up
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(fit a short vacuum hose to it, with something like a bolt in one end to block it off).
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This is the one that would otherwise go to the VSV
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(the VSV is the solenoid used by the standard ECU to control boost
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- you need to disable this when running an aftermarket boost controller such as the AVCR.
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Blocking one of the actuator ports will do this).
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As you look at the actuator from the passenger side of the car, the right hand port of the actuator
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(if it has 2 ports) is the one that would go to the VSV.
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