How variable geometry turbochargers (VGT), or variable nozzle turbochargers (VNT) work. Variable geometry turbos purpose vanes to modify the air catamenia path of the exhaust gases to maximize boost across the entire rev range. During depression boost operations, the vanes practice a narrow path to the exhaust turbine. As the revs increase too exhaust builds, an actuator rotates the vanes, increasing the surface area of the path to the turbine, too allowing for greater flow, hence increasing boost at higher RPM. Variable geometry turbochargers tin brand twin turbo charging systems obsolete.
Here's a quick video on how they work:
Related Videos:
Turbochargers - http://youtu.be/zenMEj0cAC4
Actuators - http://youtu.be/kaAz8TIeYHs
Purpose of Turbo - http://youtu.be/vaL6LFQHD-k
Twin Turbos - http://youtu.be/3wFuR1x-Hes
Twin Turbo Diesel - http://youtu.be/DRcmgibm-aA
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