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      11-25-2007, 06:56 PM   #134
scalbert
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Drives: '13 S4, '15 Q7
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Quote:
Originally Posted by DrDomer View Post
In the idle phase the wastegates default to closed. At least that's what the documentation at the top of the Forced Induction forum says. Technically if the wastegates are closed then all exhaust gases go to the turbine of the turbocharger to build boost (makes sense - less turbo lag). The solenoids actuate the wastegates to open them to bleed exhaust gases and prevent overboost.
Yes, at idle with the engine running, it closes to help efficiency. But if the vacuum lines were removed or with the engine not running, the wastegates would be open.
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