BorgWarner EFR 8474 Turbo (12747100019)

The EFR8474 is a brand new release for 2019 and represents the state-of-the-art from BorgWarner Turbo Systems. This unique turbo was designed specifically by BW engineering to combine the high flowing 68mm compressor inducer with a low inertia (fast spooling) 84mm exducer to allow the same footprint to breathe a LOT better up top without compromising down low and midrange.  Efficiency plateaus are widened as a result.  RPM Capabilities have also been re-evaluated in which higher pressure ratios can be better utilized.That’s a 21.8% improvement in flow for a little bit of offset spool RPM, all on the same sized turbo!  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.  EFR8474 is intended for applications which will push a turbo to the limit with high boost.  This hybrid turbo uses the lightweight alloy bearing housing derived from Indycar with an aggressive 68mm inducer compressor wheel.

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 84mm FMW compressor (68mm inducer) the 8474 houses our traditional 7 blade EFR extended-tip compressor wheel design capable of 95 lb/min airflow rate. Ceramic Ball Bearing only, watercooling optional (recommended). We strongly recommend using an EFR Speed Sensor if you plan to run to the limit.

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 oil control orifice – (aka oil restrictor) **no restrictor can be used with EFR turbos, Use -6AN Line when turbo is over 18? from Oil Feed**
• 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