What is the purpose of the A/R ratio on a turbine housing?

The A/R ratio, or area-to-radius ratio, on a turbine housing dictates the size of the exhaust gas passage. A larger A/R like 1.28 generally allows more exhaust gas flow, which can help the turbocharger produce more power at higher RPMs, but it might slightly delay initial spool-up compared to a smaller A/R.

What does 'T4 Divided' inlet mean for my exhaust manifold?

A T4 divided inlet means the housing has two separate entry ports for exhaust gases, typically corresponding to the exhaust pulses from two cylinder banks on an engine. This design helps prevent exhaust gas interference between cylinders, leading to more efficient turbine operation and improved turbo response.

What are the benefits of a V-band outlet?

A V-band outlet uses a clamp system to secure the exhaust connection, which is generally easier to install and remove than traditional bolted flanges. This design also creates a very strong and leak-free seal, crucial for maintaining boost pressure and exhaust flow efficiency.

Garrett G45 Turbine Housing Kit T4 V-Band 1.28 A/R 757707-00

Name: Garrett G45 Turbine Housing Kit Div T4 / V-Band 1.28 A/R - Standard Rotation
Brand: Garrett
SKU: garrett-garrett-g45-turbine-housing-kit-div-t4-v-band-1-28-a-r-standard-rotation-t14-473235
Price: 1536.13 USD
Availability: BackOrder

Garrett G45 Turbine Housing Kit Div T4 / V-Band 1.28 A/R - Standard Rotation

$1536.13

On Backorder

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

Garrett G45 Turbine Housing Kit Div T4 / V-Band 1.28 A/R - Standard Rotation

Key Features

Fits Garrett G45 turbochargers.
Features a 1.28 A/R ratio for optimized exhaust flow and spool characteristics.
Designed with a T4 divided exhaust manifold inlet for improved turbine efficiency.
Equipped with a V-band exhaust outlet for a secure and easy connection.
Constructed from durable cast iron for longevity in high-temperature environments.
Standard rotation orientation.

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Product Details

This Garrett G45 turbine housing features a robust cast iron construction and a 1.28 A/R (area-to-radius) ratio, which is crucial for controlling exhaust gas flow and determining the turbocharger's spool characteristics. It's designed for a T4 divided exhaust manifold entry and a V-band exhaust outlet, offering a solid foundation for high-performance forced induction setups. The choice of a 1.28 A/R is often selected for applications where a balance between quick spool and high-end power is desired, particularly on larger displacement engines or those aiming for significant horsepower gains.

The divided T4 inlet is a key design element, separating the exhaust pulses from each cylinder bank. This separation helps to prevent exhaust gas reversion and improves the efficiency of the turbine wheel, leading to a more responsive turbocharger. The V-band outlet simplifies the exhaust connection, making installation more straightforward and ensuring a secure, leak-free seal compared to traditional flanged connections. This housing is built to handle the demands of performance applications, offering a well-built component for enthusiasts looking to optimize their turbo system's efficiency and power output.

When building a custom turbo system, selecting the correct turbine housing is paramount. This Garrett housing is a popular choice for its durability and the performance characteristics associated with its specific A/R ratio and inlet/outlet configuration. It's important to note that this part is not CARB approved and cannot be shipped to California. Always consult with your turbo system designer or a qualified performance tuner to ensure this housing is the right match for your specific engine and performance goals.