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

The A/R ratio, or Area/Radius, measures the size of the turbine housing's volute. A lower A/R like .82 generally leads to quicker turbocharger spool-up, improving throttle response. A higher A/R allows for more exhaust flow at higher RPMs, supporting more top-end horsepower.

What material is this turbine housing made from?

This turbine housing is made from high-silicon cast iron. This material is chosen for its ability to withstand the extreme heat and pressure generated by exhaust gases in a turbocharged engine.

What is included in this turbine housing kit?

This kit includes the Garrett GT30R turbine housing. You will need to source a compatible V-band clamp and exhaust manifold gasket separately for installation.

Garrett GT30R Turbine Housing Kit 0.82 A/R T4 V-Band 740902-

Name: Garrett GT30R Turbine Housing Kit O/V T4 / V-Band 0.82 A/R (Hi Sil)
Brand: Garrett
SKU: garrett-garrett-gt30r-turbine-housing-kit-o-v-t4-v-band-0-82-a-r-hi-sil-t14-23427
Price: 505.46 USD
Availability: BackOrder

Garrett GT30R Turbine Housing Kit O/V T4 / V-Band 0.82 A/R (Hi Sil)

$505.46

On Backorder

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

Garrett GT30R Turbine Housing Kit O/V T4 / V-Band 0.82 A/R (Hi Sil) grt740902-0014

Key Features

Fits Garrett GT30R series turbochargers.
Features a .82 A/R (Area/Radius) ratio for balanced spool and airflow.
High-silicon cast iron construction for durability under high temperatures.
T4 exhaust inlet flange for manifold connection.
V-band exhaust outlet for downpipe connection.
Designed for custom turbo builds and performance upgrades.

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Product Details

If you're building a custom turbo system or upgrading your existing Garrett GT30R turbocharger, this turbine housing kit is a key component. It controls how exhaust gases flow into the turbine wheel, directly impacting your turbo's spool characteristics and top-end power. This specific housing features a .82 A/R (Area/Radius) ratio, which is a good balance for many performance applications, offering a quicker spool than larger A/Rs while still supporting significant airflow for higher horsepower goals.

Constructed from high-silicon cast iron, this housing is built to withstand the extreme temperatures and pressures found in performance turbocharging. The T4 flange and V-band connection offer a robust and leak-free seal to your exhaust manifold and downpipe, respectively. This kit is designed for the Garrett GT30R series turbochargers, ensuring proper fitment and performance when paired with the correct turbine wheel. The .82 A/R is a popular choice for those looking for improved throttle response over smaller A/Rs without sacrificing too much high-RPM breathing capability.

This kit includes the turbine housing itself. Ensure you have the necessary V-band clamp and gasket for installation. Please note that this part is not CARB approved and cannot be shipped to California.