Xona Rotor has made several major innovations with its XR line of performance turbochargers with features that enhance performance and durability. Among them is Xona’s proprietary variable-preload ball bearing cartridge system. Traditional bearing systems that lack adequate preload can experience ball sliding and scuffing at high shaft speeds, leading to fretting of the bearing races and ultimately the life of the bearing will be cut short. Xona engineered their way around this issue with aplomb.
The high-strength stainless steel bearing housing itself is a fully-machined component equipped with an extended water jacket. By encompassing the turbine seal ring land area, this advanced cooling feature combats heat soakback, which in turn prevents piston rings from collapsing and contributes to enhanced setup durability at higher temperatures.
Xona Rotor has left nothing on the table when it comes to their revolutionary bearing system. Xona XR turbochargers use hybrid (ceramic balls and steel races) ball bearing cartridges unlike those found elsewhere. These precise ABEC 7 angular contact ball bearings feature advanced M62 high-speed powder metal steel races, silicon nitride ceramic balls and metallic ball cages for decreased friction and increased temperature tolerance, which makes a tremendous difference in preventing a melted ball cage. Over standard ball bearing systems, these features deliver significantly enhanced strength and durability at extreme temperatures.
While most performance turbochargers today use a single piston ring for sealing the shaft at each end, Xona XR turbochargers employ twin rings at the compressor as well as the turbine. This feature dramatically reduces oil leakage and gas intrusion at both ends of the rotating assembly. Furthermore, since the sealing load is spread across two rings, wear rates are reduced and seal life is extended. Complementing this are large-diameter oil slingers incorporated into both ends of the shaft, further reducing splash oil at the piston ring seal location within the bearing cartridge.
The compressor register of the CHRA features an overbuilt compressor backplate and cover interface system for extremely high external load tolerance, limiting possible structural distortion that can lead to rubbing of the compressor wheel and premature turbocharger failure.
At the oil inlet, XR turbochargers offer a choice of 7/16" inverted flare or straight M12x1.25 connections. Built into the oil inlet cavity of the CHRA is a large volume “last ditch” oil filter element that prevents oil contaminants from entering the bearing system and plugging oil passages within the turbocharger. At the other end of the Xona XR’s bearing housing, a modular oil drain flange allows for a variety of bolt spacing.
Xona XR6556 Turbocharger Features:
- Rated for 350-680 horsepower
- 57.5mm/79mm compressor wheel
- 60mm/56mm turbine wheel
- 65lbs/min max compressor flow
- Xona X2C compressor housing
- Compatible with Xona XR56 Series turbine housings
