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This paper presents the adjustment of an extended coherent flame model - three zones (ECFM-3Z) by the analysis of its variables α and β for application in a 3D computational fluid dynamics (CFD) model of a two valve engine fueled with ethanol. The engine is aspirated and uses direct injection of ethanol as a single injection. High frequency pressure gauges are used at the cylinder, intake and exhaust manifolds in order to perform a three pressure analysis (TPA) and this data were used as boundary conditions for the CFD model. In the tests the engine speed varied in the range of 1500 to 4000 rpm, and throttle position in the range of 20% to 100% (WOT), although wide open throttle (WOT) was used for adjustment of the combustion model parameters. The computational model uses the ES-ICE module of PROSTAR for moving mesh generation, implementation of boundary conditions and transient analysis of global variables.