grigor
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- Jan 20, 2006
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- VS Executive, R31, R33
gates
A wastegate is simply a valve to dump excess exhaust gasses to prevent overboosting of the turbo. It can be an internal gate built into the turbine housing or an external gate built into the exhaust manifold.
The most basic control is a diaphragm fed from boost air fighting against a spring which is trying to keep the gate closed. When boost exceeds the spring pressure, the gate gradually opens.
Next step up is electronic control where a sensor reads the boost pressure and compares it against your setting in a microprocessor. This then tells a wastegate solenoid valve to open and shut rapidly, again preventing overboosting.
You have to try to match the boost level and gate spring to within about 3psi or the solenoid valve has difficulty maintaining constant boost levels. My R33 runs 20psi, the gate spring is 15psi and my controller is not happy at low RPM where there is heaps of available boost.
A wastegate is simply a valve to dump excess exhaust gasses to prevent overboosting of the turbo. It can be an internal gate built into the turbine housing or an external gate built into the exhaust manifold.
The most basic control is a diaphragm fed from boost air fighting against a spring which is trying to keep the gate closed. When boost exceeds the spring pressure, the gate gradually opens.
Next step up is electronic control where a sensor reads the boost pressure and compares it against your setting in a microprocessor. This then tells a wastegate solenoid valve to open and shut rapidly, again preventing overboosting.
You have to try to match the boost level and gate spring to within about 3psi or the solenoid valve has difficulty maintaining constant boost levels. My R33 runs 20psi, the gate spring is 15psi and my controller is not happy at low RPM where there is heaps of available boost.