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In the last decade most of the car companies have launched SI engines with gasoline direct injection (GDI) technology into the market. A great challenge when designing favourable combustion processes in such engines is to set up a proper injection strategy. Although modern gasoline injectors are able to generate pressure up to 300 bar and thanks to very fast piezo-driven actuators the fuel injection can be divided into several high precision injections, there is still a problem with the fuel penetration occurring as a wall wetting on piston crown or cylinder wall, which leads to higher emissions of hydrocarbons. To avoid these disadvantages the injectors producers hardly try to increase the fuel pressure and decrease injector orifice diameter which results in high costs of design and manufacturing of feeding systems for modern SI engines. Superheated processes in the injection system can improve evaporating through fuel flash-boiling which may alter fuel-air mixing, increase the spray angle, and decrease SMD. In this paper we present a comparison numerical results of fuel injection, between well-known Eulerian and extended Lagrangian module with flash-boiling model from commercial code AVL Fire. Based on numerical results and deep literature overview, further suggested improvements in numerical model will be discussed. Key words: Superheated Fuel Sprays, Flash-Boling Sprays, SI Engines, GDI injectors, secondary brake-up