BorgWarner Iron EFR 8474 Turbo 68mm Ball Bearing w/ T4 Divided 1.45 A/

BorgWarner EFR 8474 Turbocharger Overview

The EFR 8474 from BorgWarner Turbo Systems represents a pinnacle in high-performance, race-focused turbocharger technology. Engineered for applications requiring 500–800+ horsepower, it delivers exceptional response, a broad powerband, and unmatched reliability. With a proven track record, including consecutive victories in the Pike's Peak Unlimited class, the EFR 8474 is a premier choice for competitive motorsport and high-performance street builds.

Innovative Design for Peak Performance

The EFR 8474 features an 84mm compressor wheel with lower inertia than its 83mm predecessor, ensuring rapid spool times and impressive top-end airflow. The extended-tip compressor wheel design and optimized efficiency plateaus allow for higher pressure ratios and increased performance throughout the powerband. Combined with the lightweight 74mm Gamma-Ti (titanium aluminide) turbine wheel, this turbo achieves a 22% increase in airflow compared to its predecessor, with a maximum flow rate of 95 lb/min at 127,000 RPM shaft speed.

To further enhance its adaptability, the EFR 8474 is available in four turbine housing configurations to suit a variety of applications:

1. 0.83 A/R T3 Undivided (Internal WG) (#12741008000)
2. 0.92 A/R T4 Twin Scroll (Internal WG) (#12741008001)
3. 1.05 A/R T4 Twin Scroll (External WG) (#12741019002)
4. 1.45 A/R T4 Twin Scroll (External WG) (#12741008003)

Notable Features

The EFR 8474 incorporates advanced technologies and features to maximize performance and durability:

• Gamma-Ti Turbine Wheel: Lightweight and low inertia for quick spool and durability
• Integrated Compressor Recirculation Valve (CRV): Built-in for efficient operation
• Dual Ceramic Ball Bearing Assembly: With a metal cage for reduced friction and extreme durability
• Boost Control Solenoid Valve (BCSV): Integrated for precise boost control
• Black Anodized Forged Milled Compressor Wheel (FMW): Enhanced blade geometry for improved efficiency and visual differentiation
• Extended Tip Technology: Optimized for high airflow and performance
• Compressor Cover with Speed Sensor Mounting Provisions: Allows easy integration of speed sensors

Compressor and Turbine Specifications

• Compressor Specifications:

  • Type: Forged-Milled Wheel (FMW) with Extended Tip Technology
  • Wheel OD (Exducer): 84mm
  • Wheel Inducer: 68mm
  • Max Flow Rate: 95 lb/min
  • Inlet: 4″ Ported Shroud Hose Coupler
  • Outlet: 2.5″ Hose Coupler with optional V-Band

• Turbine Specifications:

  • Type: Gamma-Ti Low Inertia Wheel
  • Wheel OD: 74mm
  • Housing Material: Stainless Steel
  • Outlet: GT V-Band (~92mm OD)

Kit Components

The EFR 8474 kit includes:

• Super-Core
• Turbine Housing
• Clamp Plate Hardware

For wastegated configurations, the kit also includes:

• Actuator
• Actuator Bracket

The wastegate actuators are available in three configurations, tailored for different boost ranges:

• Low Boost Canister: 4.0 psi opening, 13.7 psi full stroke
• Medium Boost Canister: 8.8 psi opening, 20.6 psi full stroke
• High Boost Canister: 16.8 psi opening, 32.3 psi full stroke

Proven Track Record

Recognized worldwide for class-leading performance, the EFR series turbochargers have powered race cars in the Verizon IndyCar Series since 2012, amassing over 1.25 million trouble-free miles. BorgWarner is the Official Turbocharger Partner of the series, demonstrating the reliability and performance of the EFR product line.

Applications and Compatibility

The EFR 8474 is compatible with single-turbo applications for engines ranging from 2L to 6L, as well as twin-turbo configurations for V6 and V8 engines. It delivers unparalleled performance for those seeking to maximize horsepower and response in both street and race environments.