BorgWarner 12919097002 EFR 9174 B2 SuperCore Turbocharger Cast Iron Bearing Housing

The BorgWarner EFR 9174 SuperCore represents the pinnacle of aftermarket turbocharger technology, engineered specifically for high-performance racing applications in the 600-1000 horsepower range. This B2 frame supercore assembly features a cast iron bearing housing and incorporates cutting-edge materials and engineering to deliver exceptional boost response, extreme durability, and reliable high-power performance.

Advanced Engineering Features:

• Gamma-Ti Turbine Wheel: 74mm lightweight titanium-aluminide turbine wheel paired with a 65mm exducer for optimal exhaust flow and reduced rotational inertia
• Forged Milled Compressor Wheel (FMW): 68mm inducer / 91mm exducer extended-tip design capable of 95 lb/min airflow and 45+ psi boost
• Dual Row Ceramic Ball Bearings: Metal cage bearing assembly provides the lowest friction, fastest spool response, and extreme durability with built-in 2mm oil restrictor
• Integrated Compressor Recirculation Valve (CRV): Built-in bypass valve helps prevent compressor surge and eliminates boost drop-off during gear shifts
• Boost Control Solenoid Valve (BCSV): Factory-integrated electronic boost control solenoid mounted to compressor housing
• Water-Cooled Bearing Housing: Cast iron center section with water cooling provisions using 14mm banjo bolts (water cooling recommended)
• Double Seals: Advanced sealing on both turbine and compressor ends for maximum durability and resistance to oil seepage
• Speed Sensor Mounting: Compressor cover includes provisions for optional speed sensor installation

Compressor Housing Specifications:

• 4-inch inlet diameter
• 2.5-inch hose coupler outlet
• Integrated CRV and BCSV mounting

Application Range:

• Ideal for single turbo applications: 600-1000 HP
• Twin turbo applications: 1400+ HP
• Perfect for time attack, road racing, drift, rally, and high-performance street applications

SuperCore Configuration: This is a supercore assembly that includes the center rotating assembly with compressor housing and bearing housing. Turbine housing, clamp plate hardware, wastegate, and actuator are sold separately, allowing you to configure the turbo with your choice of T3 or T4 turbine housing options with various A/R ratios.

Important Installation Notes: No external oil restrictor should be used with EFR turbochargers as they feature a built-in oil control orifice. The oil feed fitting is -4 AN located on top of the bearing housing. Water cooling is strongly recommended for optimal bearing life and performance.

The EFR 9174 combines the proven 8374 turbine with the larger 9180 compressor, creating a unique hybrid that delivers slightly more power than the 8374 with faster spool characteristics than the 9180. This makes it one of the most versatile and popular turbos in the EFR B2 lineup for serious performance enthusiasts.