This paper presents the results on the effects of die-casting process on the strength parameters of castings of the aluminium AlSi9Cu3 alloy
belonging to the group of EN AB-46000, made on renovated high pressure die-casting machine. Specimens for quality testing were taken
from the places of the casting most loaded during the service. The aim of a research was to prove how the new die-casting process control
capabilities influence on the tensile strength of the cast material defined as a value of the breaking force of the specimens. It has been
found that it is possible to specify a set of recommended settings valves of second (II) and third (III) phase, which are responsible for
filling the metal mould on die-casting pressure machine. From the point of view of the finished cast element, it was noticed that exceeding
the prescribed values of valve settings does not bring further benefits and even causes unnecessary overload and reduce the durability of
the mold. Moreover, it was noticed that reduction of the predetermined setting of the second phase (II) valve leads to the formation of
casting defects again.