What is the A/R ratio and what does it affect?

The A/R ratio (Area/Radius) of a turbine housing indicates its flow capacity. A 0.86 A/R, as found on this housing, generally promotes quicker turbocharger spool-up compared to larger A/R ratios, while also influencing the engine's top-end power band.

What material is this turbine housing made from?

This turbine housing is constructed from high-silicon cast iron. This material is chosen for its ability to withstand the high temperatures and pressures generated in a turbocharger's exhaust side.

Can this part be shipped to California?

No, this turbine housing is not CARB approved and cannot be shipped to California due to emissions regulations.

Garrett GT28R Turbine Housing 0.86 A/R 430609-5231

Name: Garrett GT28R THWA O/V T25 / 5-Bolt 0.86 A/R (Hi Sil)
Brand: Garrett
SKU: garrett-garrett-gt28r-thwa-o-v-t25-5-bolt-0-86-a-r-hi-sil-t14-22758
Price: 327.91 USD
Availability: BackOrder

Garrett GT28R THWA O/V T25 / 5-Bolt 0.86 A/R (Hi Sil)

$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, 0.86 A/R, T25 flange, 5-bolt outlet. Part# 430609-5231. Not CARB approved.

Key Features

This product is a Garrett GT28R turbine housing.
It features a T25 inlet flange.
The outlet is a 5-bolt pattern.
The A/R ratio is 0.86.
Constructed from high-silicon cast iron for durability.
Not CARB approved and cannot be shipped to California.

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Product Details

This listing is for the Garrett GT28R turbine housing, featuring a T25 inlet flange and a 5-bolt outlet with a 0.86 A/R ratio. This housing is constructed from high-silicon cast iron, offering solid durability for forced induction setups. It's designed to work with Garrett GT28R turbochargers and is a popular choice for those looking to fine-tune their turbo system's performance characteristics. The 0.86 A/R rating influences exhaust gas flow and spool characteristics, making it a key component for achieving specific power goals.

The high-silicon cast iron construction is well-built to handle the high temperatures and pressures associated with turbocharging. This specific housing is intended for use with T25 flanged turbochargers and utilizes a 5-bolt exhaust outlet pattern, which is common on many aftermarket exhaust systems. When selecting a turbine housing A/R, consider that a smaller A/R (like this 0.86) generally promotes quicker spool-up, while a larger A/R will typically increase top-end power at the expense of some low-end response.