Borg Warner Turbocharger Housing

BorgWarner Turbocharger Housings: Engineering That Sets the Standard

When it comes to turbocharger housings, few names carry the weight of BorgWarner. As both a leading original equipment manufacturer and a serious player in the performance aftermarket, BorgWarner designs turbine housings that serve a dual purpose: rock-solid OEM reliability and the flexibility that performance builders demand. Whether you're restoring a factory boost system or tailoring a custom build, the right turbine housing is the critical link between your engine's exhaust energy and real-world power delivery.

What a Turbine Housing Actually Does

The turbine housing is the cast shell that directs hot exhaust gases from your engine's manifold onto the turbine wheel. The turbocharger housing typically consists of a turbine housing, a compressor housing, and a center bearing housing. A shaft connects the turbine wheel — housed inside the turbine chamber — to the compressor wheel, so the rotational energy generated by exhaust flow is transmitted directly to compress incoming air. Housing geometry — particularly the A/R (area-to-radius) ratio and scroll design — has a profound effect on spool speed, peak power, and overall efficiency.

BorgWarner's Turbine Housing Lineup

BorgWarner's turbocharger housings span their legendary AirWerks S-Series and the premium EFR platform, giving builders options from mild diesel upgrades to all-out competition builds.

• AirWerks S-Series (S200, S300, S400, S500): BorgWarner AirWerks turbine housings are engineered to optimize backpressure across the S200, S300, and S400 turbocharger families. All S-series turbos feature adjustable housing orientation, meaning both compressor and turbine housings can be repositioned independently — a huge advantage when fitting a turbo in tight engine bays. Flange options include T3, T4, and T6 configurations to match virtually any exhaust manifold.
• Open-Scroll vs. Twin-Scroll: When it comes to the turbine housing, BorgWarner offers two options: Volute Open Flow (VOF) and Volute Twin Scroll Flow (VTF). Key benefits of a twin-scroll turbine housing include improved low-RPM boost, increased low-RPM torque, improved fuel economy, reduced engine pumping losses, maximized turbine efficiency, and lower exhaust gas temperatures.
• EFR Series: BorgWarner's flagship performance line takes housing materials to another level. The EFR series features a stainless steel turbine housing for increased efficiency, improved durability, and corrosion resistance. Turbine housings in BorgWarner's advanced lineup are designed to fit available packaging constraints while enhancing transient performance.

A/R Ratios and Sizing Flexibility

One of BorgWarner's key advantages is the sheer range of A/R ratios and mounting configurations available. Each turbine housing allows you to change the A/R value, the installation position, or the flange pattern of the turbocharger — making it practical to re-tune boost characteristics without replacing the entire unit. S300SX3 configurations are available with T3 and T4 turbine housing options across multiple compressor wheel sizes. For larger builds, T6 housings serve the S400 and S500 frames. BorgWarner's overall performance turbocharger range supports from 200 HP to near 2,000 HP per turbo , and turbine housing selection is a key factor in reaching those targets safely.

OEM Roots, Aftermarket Reach

Schwitzer — now part of BorgWarner — pioneered heavy-duty and performance turbocharging, and the S300 and S400 AirWerks line remains the most widely used performance diesel turbo family in North America. That heritage means BorgWarner turbine housings aren't just designed for performance — they're engineered with the same quality controls used in OEM production, giving builders confidence in both fitment and longevity. Whether you're replacing a worn factory housing or speccing a fresh build, BorgWarner's catalog of turbine housings offers a proven path to better boost.