INTERNAL WASTEGATES

There are two types of wastegate: internal and external. An internal wastegate is cheap and easy to manufacture, and is usually what you’ll find as part of a factory-fitted turbocharger. In this design, a wastegate hole is located inside the turbocharger exhaust housing. This hole offers exhaust gases a route to escape, enabling them to exit without passing through the turbocharger. A simple penny washer (controlled by an actuator) blocks or lifts away from the hole, managing the level of gas that bypasses the turbo. As we’ve already highlighted, this activity influences the speed the turbocharger is able to operate at.