BorgWarner EFR 8474 Turbocharger

The EFR 8474 represents the state-of-the-art from BorgWarner Turbo Systems in 2019. The next evolution of the #1 most popular EFR turbo, the 8474 is intended for applications that require an unmatched response and broad powerband in the 500-800+hp range. Designed specifically by BW engineering to combine the high flowing 68mm compressor inducer with low inertia and quick spooling 84mm exducer allows the same footprint to breathe a LOT better up top without compromising down low and midrange.  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 inflow on the same turbo size!  Efficiency plateaus are widened as a result and higher pressure ratios can be better utilized.

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 Housing Connections:

• Inlet: 4″ Ported Shroud Hose Coupler
• Outlet: 2.5″ Hose Coupler w/ integrated Vband option

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. We strongly recommend using an EFR Speed Sensor if you plan to run this turbo to the limit (125krpm+)

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

The 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

1.05 A/R T4 Twin Scroll External-WG

0.83 A/R T3 Undivided (Internal WG)

Optional 2000 Degree Coating

Features

• Dual Row Ceramic Ball Bearings – lowest friction and fastest spool/response, most extreme durability, built-in 2mm oil restrictor
• Watercooled Center Section – water cooling 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