The more power the engine develops the more exhaust gas comes out, which spines the turbine and compressor faster, and increase the air pressure known as boost pressure, above which the fuelling can become inefficient and the engine and turbo can be damaged, so it’s important to control pressure.
Boost pressure should not be increased as a way of getting more power, unless being done by a diesel tuning specialist who can be modify fuelling, intercooling and the turbo itself, and understand the stress implications on the engine and turbo.
Later systems, such as freelander TD4, are designed to over boost when the accelerator is fully pressed, but only for a limited period of around 10 seconds. To control the boost pressure, a valve or Westgate, in the exhaust system diverts exhaust pipe. This causes the turbine to slow down, reducing the pressure from the compressor. The waste gate is usually controlled by a modulator mounted on the turbocharger housing.
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