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

The A/R ratio, or Area/Radius, on a turbine housing describes the size of the exhaust housing's internal passages. A lower A/R like .85 generally leads to quicker turbocharger spool-up at lower RPMs, while a higher A/R can help the turbocharger produce more power at higher RPMs. This .85 ratio offers a good balance for many performance applications.

What does 'Divided T4' inlet mean for my turbo system?

A divided T4 inlet means the exhaust housing has two separate entry ports for exhaust gases, which are kept separate until they reach the turbine wheel. This design helps to improve exhaust pulse separation, reduce exhaust manifold backpressure, and can lead to a more efficient turbocharger operation compared to a single-entry housing.

What is the benefit of a V-Band outlet?

The V-Band outlet uses a clamp and a grooved flange to create a seal, offering a more robust and leak-resistant connection than traditional bolted flanges. It also simplifies installation and removal of the downpipe, making maintenance or adjustments easier.

Specifications

Brand: Garrett
Part #: 757707-0032

Garrett G40 Turbine Housing Kit Div T4 / V-Band 0.85 A/R - Standard Rotation

Name: Garrett G40 Turbine Housing Kit Div T4 / V-Band 0.85 A/R - Standard Rotation
Brand: Garrett
SKU: garrett-garrett-g40-turbine-housing-kit-div-t4-v-band-0-85-a-r-standard-rotation-t14-478902
Price: 1047.75 USD
Availability: BackOrder

$1047.75

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Key Features

Fits Garrett G40 series turbochargers with standard rotation.
Features a .85 A/R (Area/Radius) ratio for balanced spool and top-end power.
Utilizes a Divided T4 exhaust inlet for improved exhaust gas management.
Equipped with a V-Band exhaust outlet for a secure and easy connection.
Constructed from durable cast iron to withstand high engine temperatures and boost pressures.
Part number 757707-0032.

This turbine housing is designed for Garrett G40 series turbochargers with standard rotation. Always confirm compatibility with your specific turbocharger model and application.

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About this part

Product Details

This is the Garrett G40 Turbine Housing Kit with a .85 A/R ratio, designed for a Divided T4 inlet and V-Band outlet. It's built for standard rotation turbochargers, making it a key component for anyone looking to build or upgrade a high-performance forced induction system. Getting the exhaust gas to flow efficiently through the turbine housing is critical for spool speed and overall power output, and this housing is engineered to help manage that flow effectively.

Garrett is well-known for its turbocharger components, and this housing is no exception. It's constructed from a durable cast iron material that can handle the high temperatures and pressures associated with boosted engines. The .85 A/R ratio is a good middle ground for many applications, offering a balance between quick spool-up and strong top-end power. This specific housing is for a divided T4 inlet, which means it has two entry ports for the exhaust gas, helping to improve exhaust pulse separation and reduce backpressure compared to a single-entry housing. The V-Band outlet simplifies installation and ensures a secure, leak-free connection to your exhaust downpipe.

When building a custom turbo system, selecting the right turbine housing is crucial. This Garrett kit is designed for enthusiasts who understand the importance of component matching for optimal performance. It's important to note that this part is not CARB approved and cannot be shipped to California. Always refer to your specific turbocharger model and vehicle application to ensure this housing is the correct fit for your build.