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This paper describes the application of CFD tools in the design optimization of intake ports, combustion chamber and injector of SAIC Motor's 2.0L turbo charged direct injection gasoline engine. For a more realistic simulation of spray processes, detailed investigations of mesh dependency, wall impingement models were conducted. The validation of the spray simulation was carried out by comparison between the experimental data and calculation results. To investigate the droplet-wall interactions, a comparison between the results from Bai's model and the instantaneous evaporation model was made. With the Star-CD code, the in-cylinder air motion, fuel injection and air/fuel mixing in the combustion system with central injector were evaluated, at different engine operation conditions and start of injection timings. Several proposed intake port options, with different tumble levels, were numerically investigated and compared.