A mean value model is presented for the transient operation of a 1.6 liter turbocharged indirect injection diesel engine. The model consists of a series of sub-models for the compressor, turbine and engine which result in a number of coupled, non-linear algebraic and differential equations. The equations are solved using a standard numerical solution package on a personal computer.The initial model calibration was performed using manufacturer supplied data and experimental data from steady state operation. Additional refinements of the model and its associated parameters were obtained through comparison with dynamic measurements on the engine. A comparison between simulated and experimental performance parameters is presented for both steady state and dynamic operation.