BorgWarner EFR 9174 Turbo
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BorgWarner EFR 9174 Turbo

The EFR9174 is a brand new release for 2016 from BorgWarner Turbo Systems. This hybrid turbo uses the lightweight alloy bearing housing derived from Indycar with a 67mm inducer compressor. EFR9174 is intended for applications which will push a turbo to the limit with high boost and critically high turbo shaft speed. This unique turbo was designed specifically by BW engineering to combine the high flowing 91mm compressor with fast spooling 74mm turbine wheel. The use of a 74mm turbine wheel allows for a max turbo speed of 125k RPM vs 116k for the bigger EFR9180.

Compressor Specifications

    • Compressor Type: Forged-Milled Wheel (FMW) Extended Tip
    • Compressor Wheel OD (exducer): 91mm
    • Compressor Wheel Inducer: 67.7mm
    • Max Flow Rate: 94 lb/min
    • Built-in BOV: All EFR compressor housings incorporate an integrated BOV.

Compressor Housing Connections:

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

Using Borg Warner’s 91mm FMW compressor (67.7mm inducer) the 9174 houses our traditional 7 blade EFR extended-tip compressor wheel design capable of 94 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


    The EFR 9174 is available in (4) different turbine housing configurations:
  • 0.83 A/R T3 Undivided (Internal WG)
  • 0.92 A/R T4 Twin Scroll (Internal WG)
  • 1.05 A/R T4 Twin Scroll (external WG)
  • 1.45 A/R T4 Twin Scroll (external WG)

Turbine outlet: GT-Vband (aka 3″ vband) ~92mm OD for all EFR turbos


  • 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
  • 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

Wastegate Info: All EFR Internal Wastegated turbos come standard with a medium boost actuator for boost levels of up to 16psi. For boost applications above that will need to add the High Boost actuator. Use the option tab to add it to the order.

V-Band Discharge Flange/Clamp: All of the EFR Internal Wastegated turbos use a special BW Vband flange/Clamp that is not a standard V-Band. The Down Pipe V-Band Flange and Clamp are not included with the turbo. Use Option tab to add them to the order.

*Includes ground shipping within the Continental United States only. Please contact us for all other shipping options.

  • Item #: BW-EFR-9174

BorgWarner EFR 9174 Turbo

Price: $1,466.00
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