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Variable Turbine Geometry

Regulation of the turbocharger is necessary in order for almost constant boost pressure to be available across the widest engine-speed range possible. The variable turbine geometry continually adjusts the output of the turbines. Adjustable vanes guarantee this across a wide control range while at the same time maintaining a high level of efficiency.
If the gas pressure is reduced at a low engine speed, the vanes are adjusted to reduce the cross-section in the turbocharger, resulting in an increase in gas pressure.
If the exhaust gas pressure is increased at a higher engine speed, the cross-section of the supply line is increased by adjusting the vanes.

Turbochargers with variable turbine geometry are particularly efficient at partial load and turbo lag is eliminated. They increase engine power, improve its response significantly and can also have a beneficial effect on its emissions.