BorgWarner EFR 8374 0.92 A/R T4 Twin-Scroll Internal-Wastegate Turbocharger

BorgWarner EFR 8374 0.92 A/R T4 Twin-Scroll Internal-Wastegate Turbocharger

Part Number: 179357

The BorgWarner EFR 8374 is a premium dual-ball-bearing turbocharger rated by BorgWarner for 475–750 horsepower. Part number 179357 is a fixed complete assembly combining the 8374 compressor and 74 mm Gamma-Ti turbine with a 0.92 A/R divided T4 turbine housing and an integrated internal wastegate.

The 62 mm nominal inducer and 84 mm nominal outside-diameter forged-milled compressor wheel provide substantial airflow in a compact B2-frame package. BorgWarner pairs it with a low-inertia 74/65 mm Gamma-Ti turbine wheel and a dual-row ceramic ball-bearing cartridge to improve transient response and reduce rotating inertia relative to a conventional nickel-alloy turbine and journal-bearing arrangement.

EFR integration reduces the number of separate components required around the turbocharger. The compressor cover incorporates a compressor recirculation valve and boost-control solenoid valve, while the stainless-steel turbine housing includes a large internal wastegate. The compressor cover is also machined with a turbo-speed-sensor provision for customers who add the optional sensor.

This exact assembly uses BorgWarner supercore 179257 and turbine-housing assembly 12741008001. It is supplied as one fixed configuration rather than a turbine-housing dropdown product.

Key Features

• BorgWarner-rated 475–750 horsepower range
• 62 mm nominal forged-milled compressor-wheel inducer
• 84 mm nominal compressor-wheel outside diameter
• 74 mm Gamma-Ti turbine-wheel outside diameter with 65 mm exducer
• Dual-row ceramic ball-bearing cartridge with metal cage
• 0.92 A/R divided T4 twin-scroll turbine housing
• Investment-cast 300-series stainless-steel turbine housing
• Integrated internal wastegate
• Large 36 mm wastegate port with 42 mm valve head
• Integrated compressor recirculation valve
• Integrated electronic boost-control solenoid valve
• Extended-tip compressor-wheel technology
• Pre-machined turbo-speed-sensor mounting provision
• Clockable compressor cover and turbine housing
• Water-cooled iron bearing housing
• Integrated oil-flow restriction in the bearing housing
• Three-inch half-Marmon turbine-outlet connection

Kit Includes

• 179357 — BorgWarner EFR 8374 complete turbocharger assembly
• 179257 — BorgWarner EFR 8374 iron-bearing-housing supercore within the assembled turbocharger
• 12741008001 — BorgWarner 0.92 A/R divided T4 internal-wastegate turbine-housing assembly
• Integrated compressor recirculation valve
• Integrated boost-control solenoid valve
• Internal wastegate, actuator, bracket, and linkage as installed on the complete assembly
• Factory oil-inlet fitting and installed bearing-housing hardware

Turbocharger Specifications

Configuration

• Turbocharger family: BorgWarner EFR
• Model: EFR 8374-C
• Complete assembly part number: 179357
• Supercore part number: 179257
• Turbine-housing assembly part number: 12741008001
• Frame size: B2
• Published power range: 475–750 horsepower
• Bearing-housing material: Iron

Compressor

• Compressor-wheel inducer: 62 mm nominal
• Compressor-wheel outside diameter: 84 mm nominal
• Compressor-wheel construction: Forged and milled aluminum
• Compressor technology: Extended tip
• Compressor inlet: 101.6 mm / 4.00 inches
• Compressor outlet: 63.5 mm / 2.50 inches
• Compressor outlet style: Hose connection as supplied, with machining provision for a compatible V-band connection
• Compressor recirculation valve: Integrated
• Boost-control solenoid valve: Integrated
• Turbo-speed-sensor provision: Pre-machined; sensor sold separately

Turbine

• Turbine-wheel material: Gamma titanium aluminide
• Turbine-wheel outside diameter: 74 mm
• Turbine-wheel exducer: 65 mm
• Turbine-housing A/R: 0.92
• Turbine inlet: Divided T4
• Scroll configuration: Twin scroll
• Turbine-housing material: Investment-cast 300-series stainless steel
• Wastegate configuration: Integrated internal wastegate
• Wastegate port diameter: 36 mm
• Wastegate valve-head diameter: 42 mm
• Turbine outlet: Three-inch half-Marmon V-band-style connection

Bearing Housing, Oil, and Coolant Connections

• Bearing system: Dual-row ceramic ball bearings with metal cage
• Oil inlet: -4AN male fitting
• Oil-flow restriction: Integrated into the bearing housing
• Oil-drain port: 3/8-NPT threaded connection
• Oil-drain flange provision: Two M8 × 1.25 holes on 38 mm centers
• Minimum recommended oil-drain size: -8AN / 1/2-inch inside diameter
• Coolant ports: Four M14 × 1.5 straight-thread ports
• Coolant routing: Cross-flow through one lower inlet and the diagonally opposite upper outlet

Application Notes

• Part number 179357 is a fixed complete turbocharger assembly with a 0.92 A/R divided T4 turbine housing and internal wastegate.
• This listing should not be configured with a turbine-housing dropdown; alternate EFR 8374 housings and complete assemblies use different BorgWarner part numbers.
• The divided T4 turbine housing is intended for a properly divided exhaust manifold that preserves exhaust-pulse separation to the turbine inlet.
• Using the housing with an undivided manifold removes most of the pulse-separation benefit associated with the twin-scroll configuration.
• The integrated compressor recirculation valve may be retained, blocked off with the appropriate BorgWarner service components, or supplemented by an external valve where the system design requires it.
• The integrated boost-control solenoid requires ECU wiring, pneumatic routing, and application-specific control configuration.
• Minimum boost pressure and usable control range depend on the installed actuator, actuator preload, exhaust-manifold pressure, and boost-control strategy.
• Water cooling is strongly recommended for the bearing housing.
• An additional oil restrictor should not be added unless required by a verified application-specific oil-pressure condition; BorgWarner incorporates the primary restriction into the bearing housing.
• The turbo-speed sensor is not included, and the compressor-cover passage requires final drill-through when the optional sensor is installed.
• The turbine-outlet V-band clamp and mating half-Marmon downpipe flange are not included.
• The divided T4 turbine-inlet gasket is not included.
• The oil-drain gasket, oil-drain fitting, oil-feed line, oil-drain line, and coolant lines and fittings are not included.
• Intake plumbing, charge piping, intercooler, exhaust manifold, downpipe, wiring connector, heat-management components, and application-specific installation hardware are not included.
• This is a universal performance turbocharger and is not supplied as a vehicle-specific installation kit.
• Final turbocharger selection should account for engine displacement, airflow demand, fuel, intended boost pressure, engine-speed range, exhaust-manifold design, backpressure, response target, and duty cycle.

Emissions and Competition-Use Notice

Unless specifically identified as emissions-legal for the applicable vehicle and application, this product is intended for sanctioned competition, off-road, or other non-emissions-controlled use. Installation or use on an emissions-controlled vehicle operated on public roads may violate federal, state, or local law. The purchaser and installer are responsible for confirming and maintaining compliance with all applicable emissions and vehicle-use regulations.