The growing demand of automotive market for innovative technologies of internal combustion engines lead to the development of engines that operate with alternative fuels, such as ethanol. New technologies involve the use of elements as turbochargers that increase the air density and provide increased power density, and enables the use downsizing techniques, which consists of engine with low volumetric displacement that provides lower mechanical friction and pumping losses producing higher brake efficiency and recovering its by means of turbocharging. The time-consumed and the associated technology development costs are major issues for the innovation in this sector. In this way, the CFD (Computational Fluid Dynamics) 1D and 3D are relevant means to shorter time and costs.This paper uses these technologies to simulate boosted SI engine behavior. The computational simulation is able to provide satisfactory results of performance from engines. To validate the model, experimental performance results such as Brake Mean Effective Pressure, Brake Specific Fuel Consumption and combustion parameters from experimental data carried out by Baeta  was used. The comparison obtained between experimental data and numerical simulation revealed that proposed model is able to reproduce the engine experimental results satisfactorily.