The aim of this paper is to study the influence of the thermodynamic conditions on the consequences of the rapid vaporization of CO2. This study is motivated by the lack of experiments characterizing those transient phenomena over a wide range of thermodynamic conditions. For that purpose, a complete test section was designed based on the Joule effect to deliver the energy discharge in pressurized CO2. The transient deposit of power in the liquid have two consequences: the generation of a pressure wave (of several bars) due to the transient creation of vapour, and a slow compression in the test section due to the creation and expansion of vapour (few cm3). This experiment had been performed 200 times over a wide range of thermodynamics conditions, (Pi, Ti, E)∈[2.55MPa, 6MPa]×[-12 ◦C, 22 ◦C]×[70 J, 310 J]. From this databank, significant tendencies are extracted from the maximum of overpressure generated and the mass of vapour created function of the test conditions. Lastly, a simple model permits to predict the first pressure peak as a function of the test conditions. This work, motivated by the so-called Fuel Coolant Interaction (FCI) nuclear safety related problematic, brings consistent data allowing to better characterize the small scale processes for such transient vaporization phenomena.