Published by Tim Scott on Jun 19, 2015

Our VNT VGT testing video demonstrates how VGT (Variable Geometry Turbocharger) or VNT (Variable Nozzle Turbine) turbochargers work and testing the actuator after our turbo rebuild service.

Our demonstration shows the Garrett VGT turbocharger which is used on many light-duty diesel engines such as GMC/Chevrolet Duramax, Ford PowerStroke, Mercedes, Volkswagon TDIs and more. Benefits of the VGT turbo include reduced turbo lag, improved throttle response and low RPM power, and reduced turbo load (exhaust backpressure) at high RPM.

How The VGT Turbo Actuator Works

This particular turbo uses oil pressure to hydraulically power an electronically-controlled external actuator. The actuator operates the unison or control ring, which then varies the angle of the guide vanes that control the amount of exhaust gas flow to the turbine. Our in-house testing procedure exercises the actuator to test controllability, responsiveness and ability to handle the load.

Do you have questions about your turbo and whether it is working properly? Contact us to see if we can help.