What is the A/R ratio and why does it matter?

The A/R ratio, in this case .92, refers to the Area/Radius of the turbine housing's volute. A higher A/R like .92 generally allows for better exhaust flow at higher RPMs, supporting more top-end power, while a lower A/R would promote quicker spooling. This .92 A/R is chosen to balance strong top-end performance with reasonable spool characteristics for its size.

What is a twin-scroll inlet and what are its benefits?

A twin-scroll inlet divides the exhaust manifold's pulses into two separate paths within the turbine housing. This design helps to keep exhaust pulses from interfering with each other, leading to improved exhaust scavenging and a quicker turbocharger spool-up, especially at lower engine speeds.

Does this turbine housing come with the wastegate actuator?

Yes, this BorgWarner Turbine Housing includes an integrated wastegate assembly. This simplifies installation by combining the housing and wastegate components into a single unit, reducing the need for external plumbing and separate wastegate components.

BorgWarner Turbine Housing EFR B2 74mm .92 T4 Twin Scroll WG

Name: BorgWarner Turbine Housing EFR B2 74mm .92 T4 Twin Scroll WG Assy
Brand: BorgWarner
SKU: borgwarner-borgwarner-turbine-housing-efr-b2-74mm-92-t4-twin-scroll-wg-assy-t14-4385215
Price: 1048.19 USD
Availability: InStock

BorgWarner Turbine Housing EFR B2 74mm .92 T4 Twin Scroll WG Assy

$1048.19

Only 4 left in stock

BorgWarner EFR B2 Turbine Housing 74mm .92 T4 Twin Scroll WG Assy

Key Features

Fits BorgWarner EFR B2 turbochargers.
Features a 74mm turbine inducer diameter.
Includes a .92 A/R (Area/Radius) ratio for balanced spool and top-end power.
Utilizes a T4 twin-scroll inlet flange for improved exhaust pulse separation and response.
Comes with an integrated wastegate assembly for simplified plumbing and precise boost control.
Not CARB approved; cannot be shipped to California.

This turbine housing is designed for BorgWarner EFR B2 turbochargers. Please verify compatibility with your specific turbocharger model and application.

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Product Details

BorgWarner is well-known for their high-performance turbochargers and related components. This EFR B2 Turbine Housing is a prime example of their commitment to forced induction technology. It's designed for enthusiasts looking to build or upgrade a robust turbo system, offering a 74mm inducer size and a .92 A/R ratio with a T4 twin-scroll inlet and an integrated wastegate assembly. This housing is a critical piece for controlling exhaust gas flow into the turbine wheel, directly impacting spool characteristics and top-end power potential.

The twin-scroll design helps improve exhaust pulse separation, leading to quicker turbocharger response and better efficiency, especially at lower engine speeds. The integrated wastegate assembly simplifies plumbing and ensures precise boost control. This housing is built to handle significant exhaust flow, making it suitable for high-output applications where reliable performance is paramount. The 74mm inducer size is a versatile option, balancing quick spool with the ability to support substantial airflow for increased horsepower.

When installing this turbine housing, ensure you have the correct T4 flange manifold and a compatible downpipe. Proper wastegate actuator setup and boost control are essential for optimal performance and engine safety. This part is not CARB approved and cannot be shipped to California. Always consult your turbo system's specific requirements and manufacturer guidelines for installation and tuning.