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Turbo Wastegate Works

1) Burn more fuel

2) Make more power

3) Make more exhaust to drive the turbine

If left unchecked, the cycle repeats 1,2,3 1,2,3 1,2,3 until BOOM! Your engine self-destructs. Not the most effective arrangement, so we want a solution to keep your power from climbing, unchecked. Enter the wastegate. The wastegate is actually a valve (literally, a “gate”) that permits a lot of the exhaust gas (waste) to bypass the turbine. Now we can add a fourth step:

4) The wastegate opens, allowing the turbine to slow, and the boost pressure (and by extension, the power) to fall. The cycle then repeats.Linked to the wastegate itself, is a wastegate actuator. This is just a spring loaded diaphragm that holds the wastegate closed, until some boost pressure is reached. As soon as the boost pressure is sufficient overcome the spring pressure, the wastegate is opened and the boost pressure falls. The cycle will repeat, if there’s sufficient exhaust pressure and boost (I.e., when you keep your foot in it).