VGT(Variable Geometric Turbocharger) is the device which increases the efficiency of turbocharger at low rpm and lasts optimum turbo efficiency at high rpm as varying the cross sectional area through which exhaust gas passes turbocharger impeller. It relieves turbo lag at low speed and increse engine power genetation.

Engine speed, APS signal, MAFS and Boost pressure sensor information is inputted to ECM.

ECM actuates vacuum diafragm which controls exhaust gas line as controlling VGT Control solenoid valve duty to maintain optimum state of air compression.