Currently researching gasoline injection systems operation at varied loads and speeds and finding optimal solutions for control in engine domain, equipping cars for sport competitions are increasingly more attractive concerns from many viewpoints. First, fuel price increases and secondly the imperative of mobility and high performances is continuously amplified. Then, the interest in motorsport is maintained by campaigns or media-events in the broadcasting space. Today, gasoline injection with direct jet spray into the combustion chamber and using bio-ethanol or methanol can even compete with systems using only conventional fuels. Thus, being necessary studies concerning operational peculiarities of these new types of suplly procedures in the spark ignition engines in order to improve performances,the proposed research topic is meant to be a starting point in tackling exploitation, control and adjustment of injection systems problem. It is studied both the advantages and the disadvantages of their use. It is also important the influence of injection type on the engine performances. Therefore are defined a number of criteria - the engine speed, the engine load etc.- that are expressing the fuel flow, the intake pressure, being characteristic to injection supplied engine of the competition vehicles, depending on the engine speed at which it operates under normal exploitation outside the sporting competition.