Single ball bearing systems represent the first stage of upgrading a turbocharger cartridge. In this design, the compressor-side journal bearing is replaced with a single angular contact ball bearing to reduce friction and improve response.
Because a single ball bearing can support thrust in only one direction, a thrust bearing is still required, and the turbine-side journal bearing remains unchanged.
With a single ball bearing cartridge, the compressor side benefits from reduced rotational resistance, improving turbo efficiency, performance, and durability.