How variable geometry turbochargers (VGT), or variable nozzle turbochargers (VNT) work. Variable geometry turbos piece of occupation vanes to modify the air menstruation path of the exhaust gases to maximize boost across the entire rev range. During depression boost operations, the vanes practise a narrow path to the exhaust turbine. As the revs increase in addition to exhaust builds, an actuator rotates the vanes, increasing the surface area of the path to the turbine, in addition to 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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