Page "Turbocharger" Paragraph 20

Ball bearings designed to support high speeds and temperatures are sometimes used instead of fluid bearings to support the turbine shaft.

This helps the turbocharger accelerate more quickly and reduces turbo lag.

Some variable nozzle turbochargers use a rotary electric actuator, which uses a direct stepper motor to open and close the vanes, rather than pneumatic controllers that operate based on air pressure.