Compressor impellers are produced using a variant of the aluminium investment casting process.

A rubber former is made to replicate the impeller around which a casting mould is created. The rubber former can then be extracted from the mould into which the metal is poured. Accurate blade sections and profiles are important in achieving compressor performance. Back face profile machining optimises impeller stress conditions. Boring to tight tolerance and burnishing assist balancing and fatigue resistance. The impeller is located on the shaft assembly using a threaded nut.

The turbine and impeller wheel sizes also dictate the amount of air or exhaust that can be flowed through the system, and the relative efficiency at which they operate. Generally, the larger the turbine wheel and compressor wheel, the larger the flow capacity. Measurements and shapes can vary, as well as curvature and number of blades on the wheels.

Compressor is mainly composed by compressor wheel, diffuser backboard (it is made as a whole in small-sized compressor shell) and compressor wheel. The function of compressor is to converse the turbine work into the kinetic energy and pressure energy of air, and change air kinetic energy into pressure energy through diffusing and compressor housing in order to further improve air pressure before entering air inlet pipe.

Compressor wheel usually uses aldural to mold precisely, such as ZL105 and ZL201, etc.