What does the 0.64 A/R ratio mean for my turbo?

The A/R ratio (area-to-radius) on a turbine housing affects how quickly the turbocharger spools up and how efficiently it can flow exhaust gases at higher RPMs. A 0.64 A/R generally offers a good balance, providing quicker boost response than larger A/R housings while still allowing for decent top-end flow.

What is Hi-Sil material?

Hi-Sil is a type of cast iron that Garrett uses for its durability and resistance to the high temperatures found in exhaust systems. This makes it a well-built material for turbine housings that need to withstand the rigors of forced induction.

Can this housing be used on any turbocharger?

This specific turbine housing is designed for Garrett GT28R turbochargers and features a T25 5-bolt exhaust flange. While the flange pattern is common, the internal dimensions and fitment are specific to the GT28R model. Always verify compatibility with your turbocharger's specifications.

Specifications

Brand: Garrett
Part #: 430609-0230

Garrett GT28R THWA O/V T25 / 5-Bolt 0.64 A/R (Hi Sil) Small Frame

Name: Garrett GT28R THWA O/V T25 / 5-Bolt 0.64 A/R (Hi Sil) Small Frame
Brand: Garrett
SKU: garrett-garrett-gt28r-thwa-o-v-t25-5-bolt-0-64-a-r-hi-sil-small-frame-t14-428564
Price: 327.91 USD
Availability: BackOrder

$327.91

On Backorder

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

Garrett GT28R turbine housing with a 0.64 A/R. This 5-bolt T25 housing is a well-built component for forced induction setups.

Key Features

Fits Garrett GT28R turbochargers.
Features a 0.64 A/R ratio for improved turbocharger spool and response.
Utilizes a T25 5-bolt exhaust flange for broad compatibility.
Constructed from Hi-Sil material for strength and heat resistance.
Designed for small-frame turbocharger applications.

This turbine housing is designed for Garrett GT28R turbochargers. Check manufacturer specifications to confirm compatibility with your specific turbocharger and engine build.

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About this part

Product Details

If you're building a custom turbo system or upgrading an existing one, a well-chosen turbine housing is key to matching your turbocharger's performance to your engine's needs. This Garrett GT28R turbine housing, with its 0.64 A/R ratio and T25 5-bolt flange, is designed for small-frame turbochargers where quick spool and responsive power delivery are important.

The 0.64 A/R (area-to-radius) ratio on this housing helps to create a good balance between rapid boost response at lower RPMs and the ability to breathe efficiently at higher engine speeds. It's constructed from Hi-Sil material, which is a type of cast iron known for its strength and resistance to high temperatures, making it a solid choice for demanding applications. The 5-bolt T25 exhaust flange is a common pattern, offering broad compatibility with many turbo manifolds and wastegate setups.

Keep in mind that this part is not CARB approved and cannot be shipped to California. Always consult your vehicle's specific requirements and local emissions regulations before purchasing and installing aftermarket forced induction components.