Variable-geometry turbochargers, occasionally known as variable-nozzle turbochargers, are a type of turbochargers, usually designed to allow the effective aspect ratio of the turbocharger to be altere
Volvo FM VGT diesel engine with EGR emissions technology
A cut open VGT turbocharger (VW Golf, Diesel)
Exhaust side with variable-geometry guide vanes
charge air side with compressor wheel
Boost controller
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In turbocharged internal combustion engines, a boost controller is a device sometimes used to increase the boost pressure produced by the turbocharger. It achieves this by reducing the boost pressure
A 3-port solenoid-type boost controller
A 4-port solenoid-type boost controller (used for a dual-port wastegate)