What does the .85 A/R ratio mean for my turbo's performance?

The .85 A/R ratio refers to the exhaust housing's size relative to its flow path. A higher A/R like .85 generally allows for better exhaust flow at higher engine speeds, helping the turbocharger to make more power and sustain boost longer. It typically results in a slightly slower initial spool compared to a smaller A/R housing.

What type of wastegate does this housing use?

This turbine housing is designed for a single scroll wastegate setup. This means it has one port for the wastegate actuator, which controls boost pressure by bypassing exhaust gases around the turbine wheel.

Can this turbine housing be used with any turbo manifold?

This housing is specifically designed for a T25 exhaust manifold flange. You will need a turbo manifold that features this T25 bolt pattern to properly mount the housing. It is not compatible with other flange types like T3 or V-band.

BorgWarner EFR Turbine Housing 58mm .85 T25 11581008000

Name: BorgWarner Turbine Housing EFR B1 58mm .85 T25 Flange Single Scroll WG F
Brand: BorgWarner
SKU: borgwarner-borgwarner-turbine-housing-efr-b1-58mm-85-t25-flange-single-scroll-wg-t14-4385186
Price: 602.76 USD
Availability: BackOrder

BorgWarner Turbine Housing EFR B1 58mm .85 T25 Flange Single Scroll WG F

$602.76

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

BorgWarner EFR B1 turbine housing, 58mm wheel, .85 A/R, T25 flange.

Key Features

Fits BorgWarner EFR B1 turbocharger cores.
Features a 58mm compressor wheel diameter.
Has a .85 A/R (area-to-radius) ratio for balanced spool and top-end power.
Designed for a T25 exhaust manifold flange.
Utilizes a single scroll wastegate port for simpler plumbing.
Constructed from durable materials to handle high exhaust temperatures and pressures.

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Product Details

This BorgWarner EFR B1 turbine housing features a 58mm compressor wheel and a .85 A/R (area-to-radius) ratio, designed for a T25 flange with a single scroll wastegate port. The .85 A/R ratio is a key spec that influences how quickly the turbocharger spools up and where it makes peak power. A smaller A/R, like this one, generally leads to quicker boost response at lower engine speeds, making it suitable for applications where immediate throttle response is desired. The T25 flange is a common mounting pattern for many smaller to mid-sized turbochargers, offering a good balance of flow and compact size.

Constructed with durable materials, this housing is built to withstand the high temperatures and pressures associated with forced induction. The single scroll design simplifies exhaust plumbing compared to twin-scroll setups, making installation more straightforward for many custom builds. BorgWarner is a well-known name in turbocharger technology, and their EFR (Engineered for Racing) line is recognized for its performance-oriented designs. This housing is intended for enthusiasts looking to build or upgrade a turbo system where precise control over boost response and powerband is important.

Please note that this turbine housing is not CARB approved and cannot be shipped to California. It's essential to verify compatibility with your specific turbocharger core and manifold setup before purchase. For optimal performance and longevity, proper tuning and supporting modifications are recommended.