Overview 

The PSR 5855A‑S Dual Ceramic Ball Bearing Turbocharger is engineered for 770 horsepower, making it a powerful choice for high-performance and racing applications. It features a curved-point milled A-series billet compressor wheel that enhances airflow and efficiency, paired with a lightweight A-series turbine wheel with decentered blades for faster spool-up and reduced turbo lag. The turbo’s design includes an anti-surge compressor housing with integrated speed sensor and boost reference ports for precise performance monitoring. The dual ceramic ball bearing system minimizes shaft movement, improving response and durability. It accepts a 4-inch hose inlet and 2-inch outlet on the compressor side, while the turbine side uses a T25 inlet and V-band outlet with a 0.72 A/R ratio to balance airflow and spool. The unit also features water-cooled and oil-lubricated housing with standardized fittings—such as M14×1.5 water ports, a –4 AN pre-installed oil restrictor, and a T3 flange for oil drainage—ensuring reliable thermal management and straightforward installation.

Features 

• Supports up to 770 HP – built for high-performance street and motorsport applications

• Dual ceramic ball bearing system – provides quicker spool-up, enhanced throttle response, and increased durability

• Curved-point milled A-Series billet compressor wheel – improves airflow and efficiency

• A-Series Inconel 713C turbine wheel with decentered blade design – enhances turbine efficiency and heat resistance

• T51R-modified anti-surge compressor housing – improves boost stability and reduces surge

• Integrated speed sensor and boost reference ports – for precise tuning and real-time monitoring

• T25 inlet and V-band outlet turbine housing – compact fitment with strong sealing and easy install

• 0.72 A/R turbine housing – provides a balanced mix of quick spool and high-flow performance

• Compressor side: 4" hose inlet / 2" hose outlet – optimized for airflow in tight engine bays

• Water-cooled and oil-lubricated bearing housing – ensures reliable thermal and lubrication performance

• Standardized fittings included:

1. M14 x 1.5 water ports
2. –4 AN oil inlet restrictor (pre-installed)
3. T3 oil drain flange