Borg Warner EFR 8374 Turbocharger [Turbine Housing: T4 External Wastegate 1.05 A/R] (850 HP)




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Borg Warner 8374 EFR Turbo 475-750 HP.

 Borg Warner 8374 EFR Turbo is engineered to support big power levels yet spool fast enough for professional time attack teams. The 74mm Gamma-Ti turbine wheel is the optimal match for the 62.6mm inducer / 83mm exducer FMW compressor wheel and is capable of 79lb/min airflow and 45+psi boost. This is one of the most exciting turbos in the EFR lineup for the high-power addicts. This turbo has the largest EFR compressor housing and is ideal for use in single turbo applications for the 500-800hp range, or as twin turbo applications >1400+hp. Ceramic Ball Bearing only, watercooling optional (recommended)Borg Warner's latest release, the EFR (Engineered for Racing) Series turbochargers. EFR is currently the most advanced turbo of its type engineered for the performance aftermarket. Crammed full of attributes that appeal to the performance car enthusiast, EFR is at the pinnacle of what can be done with the current state of the art.

The EFR line of turbos was born out of an internal BorgWarner Turbo Systems program labeled Advanced Aftermarket Products or AAP.The program was engineered by a cross-functional team that began with the proverbial clean-sheet of paper. No legacy products, no preconceived notions of what a turbo could or could not have; no restrictions. The aerodynamics for the product line were selected using a range of optimized combinations that would give users turbo solutions anywhere between 250 and 1000 horsepower capability per turbo. Next, a list of every notable design characteristic for an engine boosting device was tabled. Specific interest was given to new ideas that had never been formed in metal or had never been combined into an aftermarket turbo.

The result is the new EFR (Engineered for Racing) line of turbos from BorgWarner. These turbos contain a bevy of key attributes such as Gamma Ti turbine wheels, dual ceramic ball bearing cartridges and investment cast stainless steel turbine housings. Collectively, those features help give the EFR line its innovative appeal and will provide a breakthrough experience in durability, device responsiveness and installer/user satisfaction.

Compressor Specifications


Compressor Type:

 Forged-Milled Wheel (FMW) Extended Tip-

Compressor Wheel OD (exducer):


Compressor Wheel Inducer:


Max Flow Rate:

 79 lb/min-

Built-in BOV:

 All EFR compressor housings incorporate an integrated BOV.-

Compressor Housing Connections:


 4" Ported Shroud Hose Coupler


 2.5" Hose Coupler w/ integrated Vband option

Turbine Specifications


Turbine Type:

 Low Inertia Gamma-Ti Turbine Wheel-

Turbine Wheel OD:


Stainless Steel Investment cast Housing


The EFR 8374 is available in (3) different turbine housing configurations:

- 0.83 A/R T3 undivided (Internal WG)

- 0.92 A/R T4 twinscroll (Internal WG)

- 1.05 A/R T4 twinscroll (external WG)


Turbine outlet:

 GT-Vband (aka small 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


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About the manufacturer

Borg Warner

Turbine Inlet Flange T4 Divided (Twin Scroll)
Turbine Outlet Flange V-Band
Turbine A/R 1.05 A/R
Compressor Wheel OD (exducer) (mm) 83
Compressor Wheel Inducer (mm) 62.6
Max Flow Rate (lb/min) 79
Turbine Wheel OD (mm) 74