EFR 8374 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)


Compressor Specifications

• Compressor Type: Forged-Milled Wheel (FMW) Extended Tip
• Compressor Wheel OD (exducer): 83mm
• Compressor Wheel Inducer: 62.6mm
• Max Flow Rate: 79 lb/min
• Built-in BOV: All EFR compressor housings incorporate an integrated BOV
• Compressor Housing: 4" Ported shroud inlet, 2.5" hose coupler outlet w/ integrated Vband option

Turbine Specifications

• Turbine type: Low Inertia Gamma-Ti Turbine Wheel
• Turbine Wheel OD: 74mm
• Stainless Steel Investment Cast Housing
• Turbine outlet: GT-Vband (aka small 3" vband) ~92mm OD for all EFR turbos

Turbine housing options:

• T3 undivided (Internal WG) 0.83 A/R
• T4 twinscroll (Internal WG) 0.92 A/R
• T4 twinscroll (External WG) 1.05 A/R

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
• 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

Testing
Below is a dyno chart from the Sierra Sierra Evo, equipped with the EFR 8374, Full-Race Twinscroll Manifold, 2.2L engine, revving to 8500rpm with ~32 lbs (2 bar) of boost.


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.