In this paper,a newly developed variable volume efficiency turbocharging system,simplified VVE system,is presented for turbocharged inter cooler diesel engine to decrease p max and NO x emission at both rated power and maximum torque operating conditions. Simulation study is carried out to study the performance of a six cylinder turbocharged diesel engine with VVE system in place of Waste gate system. The result shows that the cylinder charging air amount is enough at maximum torque ope...