EFR 8474 represents the state-of-the-art from BorgWarner Turbo Systems. The winner of Pike’s Peak Unlimited class for the last 2 years, 8474 is intended for applicationsthath require unmatched response and a broad powerband in the 500-800+hp range.  Designed specifically to win races, BW engineering designed the 84mm compressor wheel with lower inertia than the 83mm it supercedes. The combination of a high flowing 68mm compressor inducer with a low inertia and quick spooling 84mm exducer allows the same footprint to breathe a LOT better up top without compromising low-end response and midrange torque.  Efficiency plateaus are widened as a result and higher pressure ratios can be better utilized. 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. 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 in flow on the same turbo size!  We strongly recommend using an EFR Speed Sensor if you plan to run this turbo to the limit (125krpm+)

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

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
• EFR 8474 (blue) vs EFR 8374 (black)

FEATURES

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

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