What does the 0.83 A/R ratio mean for my turbo setup?

The A/R ratio (Area/Radius) on the turbine housing affects how quickly the turbocharger spools up and its efficiency at different RPMs. A 0.83 A/R generally offers a good balance between quick throttle response at lower engine speeds and the ability to flow enough exhaust gas for significant power at higher RPMs.

What is the advantage of a V-band connection?

V-band connections use a clamp and a grooved flange to create a seal, offering a strong and reliable connection that is also easier to install and remove compared to traditional bolted flanges. This makes maintenance and adjustments more straightforward.

Why is this part not CARB approved?

CARB (California Air Resources Board) approval signifies that a part meets strict emissions standards for use in California. This assembly is not CARB approved, meaning it cannot be legally shipped to or installed on vehicles registered in California.

Garrett Turbine Housing Wastegate Assembly 740902-0094

Name: Garrett G30-725 0.83 A/R O/V V-Band Turbine Housing Wastegate Assembly
Brand: Garrett
SKU: garrett-garrett-g30-725-0-83-a-r-o-v-v-band-turbine-housing-wastegate-assembly-t14-872803
Price: 1034.95 USD
Availability: BackOrder

Garrett G30-725 0.83 A/R O/V V-Band Turbine Housing Wastegate Assembly

$1034.95

On Backorder — Expected to ship by Jul 5, 2026

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

Garrett G30-725 turbine housing and wastegate assembly.

Key Features

Fits Garrett G30-725 turbochargers.
Features a 0.83 A/R turbine housing for balanced spool and top-end power.
Includes an integrated wastegate assembly for precise boost control.
Utilizes a V-band connection for secure and easy turbine housing attachment.
This part is not CARB approved and cannot be shipped to California.

Secure CheckoutFast Shipping631-982-0042

Product Details

Garrett is well-known for their high-performance turbochargers and related components, and this G30-725 turbine housing with an integrated wastegate assembly is a prime example of their expertise. This unit is designed for enthusiasts looking to build or upgrade a forced induction system, offering a specific A/R ratio and turbine housing size that balances quick spool with top-end power.

The 0.83 A/R (Area/Radius) ratio on this turbine housing is a key specification, influencing how quickly the turbocharger spools up and how much boost it can efficiently produce at higher RPMs. A smaller A/R generally means faster spool, while a larger A/R allows for more flow and higher power potential at higher engine speeds. This particular ratio is often chosen for applications where a balance between responsiveness and peak power is desired. The V-band connection offers a secure and easy-to-service method for attaching the turbine housing to the turbocharger's center housing, and the integrated wastegate assembly helps to precisely control boost pressure, preventing over-boosting and ensuring consistent performance.

This assembly is not CARB approved and cannot be shipped to California. When planning your build, ensure this component aligns with your specific engine and turbocharger setup. Proper installation and tuning are critical for optimal performance and longevity of any forced induction system.