BorgWarner EFR 8474 - ALU - Supercore

The EFR8474 represents the state-of-the-art from BorgWarner Turbo Systems. The winner of Pike's Peak Unlimited class for the last 2 years, 8474 is intended for applications that require an unmatched response and a broad powerband in the 500-800+hp range. 

Designed specifically to win races, BorgWarner engineering designed the 84mm compressor wheel with lower inertia than the 83mm it supersedes. The combination of a high flowing 68mm compressor inducer with a low inertia and quick spooling 84mm exducer allows the same footprint to breathe a LOT better up top without compromising low-end response and midrange torque.

Efficiency plateaus are widened as a result and higher pressure ratios can be better utilized. Using Borg Warner’s large inducer “black series” 84mm billet compressor (68mm inducer) the 8474 houses the EFR extended-tip compressor wheel design capable of 95 lb/min airflow rate. Using the same 74mm Gamma-Ti turbine wheel from the EFR8374, this turbo flows an impressive 95lbs/min of air at the same 127k RPM maximum shaft speed. That’s a 22% improvement in flow on the same turbo size! We strongly recommend using an EFR Speed Sensor if you plan to run this turbo to the limit (125krpm+).

COMPRESSOR SPECIFICATIONS

• Compressor Type: Forged-Milled Wheel (FMW) Extended Tip
  
• Compressor Wheel OD (exducer): 84mm
  
• Compressor Wheel Inducer: 68mm
  
• Max Flow Rate: 95 lb/min
  
• Built-in BOV: All EFR compressor housings incorporate an integrated compressor recirculation valve
  
• Compressor Inlet: 4″ Ported Shroud Hose Coupler
  
• Compressor Outlet: 2.5″ Hose Coupler w/ integrated Vband option

TURBINE SPECIFICATIONS

• Turbine Type: Low Inertia Gamma-Ti Turbine Wheel
  
• Turbine Wheel OD: 74mm
  
• Stainless Steel Turbine Housing
  
• Turbine outlet: GT V-Band (aka 3″ V-Band) ~92mm OD for all EFR turbos

COMPRESSOR MAP

FEATURES

• Dual Row Ceramic Ball Bearings—lowest friction and fastest spool/response, most extreme durability, built-in 2mm oil restrictor
  
• Watercooled Center Section—watercooling is recommended, 14mm banjo bolts
  
• Double seals on both turbine and compressor end for extreme durability and resistance to any oil seepage
  
• Boost Control Solenoid Valve Integrated to Compressor Housing
  
• Integrated Speed Sensor mounting provisions
  
• Optional Turbo Speed Sensor Kit
  
• Optional Turbo Speed Gauge
  
  • EFR 8474 is available in (4) different turbine housing configurations
    
  • 0.83 A/R T3 Undivided (Internal WG) #12741008000
    
  • 0.92 A/R T4 Twin Scroll (Internal WG) #12741008001
    
  • 1.05 A/R T4 Twin Scroll (External WG) #12741019002
    
  • 1.45 A/R T4 Twin Scroll (External WG) #12741008003