ENGINE SYSTEMS 21 Variable Geometry Turbocharger (VGT) Figure 14 VGT 1. Actuator 2. VGT control valve 3. Unison ring 4. Vanes The key feature of the VGT is actuated vanes in the turbine housing. The vanes modify flow characteristics of exhaust gases through the turbine housing. The benefit is the ability to control boost pressure needed to accommodate various engine speeds and load conditions. An additional benefit is lower exhaust emissions. VGT closed loop system Figure 15 VGT closed loop system EGES295-2 Read all safety instructions in the "Safety Information" section of this manual before doing any procedures. Follow all warnings, cautions, and notes.
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