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

The A/R ratio (Area over Radius) on a turbine housing describes the size and shape of the volute. A 1.00 A/R ratio, like on this housing, generally offers a good balance between quick turbocharger spool-up and strong airflow at higher engine speeds.

What does 'T4 divided' mean for the inlet?

A T4 divided inlet means the housing has an internal divider that separates the exhaust gases from the two banks of cylinders before they reach the turbine wheel. This helps maintain exhaust pulse energy, leading to better turbo response and efficiency.

What material is this turbine housing made from?

This turbine housing is made from durable cast iron. This material is chosen for its ability to withstand the extreme temperatures and pressures generated by exhaust gases in a turbocharged engine.

Turbosmart Turbine Housing T4 Divided 1.00AR 70mm TS-19TH70B

Name: Turbosmart B Frame T4 Divided 1.00AR 70mm Turbine Housing
Brand: Turbosmart
SKU: turbosmart-turbosmart-b-frame-t4-divided-1-00ar-70mm-turbine-housing-t14-832600
Price: 535.49 USD
Availability: BackOrder

Turbosmart B Frame T4 Divided 1.00AR 70mm Turbine Housing

$535.49

On Backorder — Expected to ship by May 9, 2026

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

Turbosmart B Frame T4 Divided 1.00AR 70mm Turbine Housing

Key Features

Fits Turbosmart B-frame turbochargers.
T4 divided inlet flange for improved exhaust pulse separation.
1.00 A/R ratio for a balance of spool response and top-end flow.
70mm turbine wheel diameter.
Constructed from durable cast iron for high-temperature resistance.
Designed for performance turbocharged applications.

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Product Details

Turbosmart is well-known for making robust performance parts for serious automotive applications. This B-frame turbine housing is a prime example, built to handle the demands of high-output turbocharged engines. It features a T4 divided inlet, a 1.00 A/R ratio, and a 70mm turbine wheel diameter, all designed to help your turbocharger spool up quickly and efficiently.

The divided housing design is key here. It separates the exhaust pulses from each bank of cylinders, which helps maintain exhaust gas velocity and reduces exhaust manifold pressure. This can lead to improved turbocharger response and a broader powerband. The 1.00 A/R ratio is a good balance for many performance builds, offering a strong top-end flow without sacrificing too much low-end response. The 70mm turbine wheel size is also a common choice for builds looking for a significant power increase over stock.

This housing is constructed from durable cast iron, a material chosen for its ability to withstand high temperatures and pressures found in exhaust systems. It's designed to fit Turbosmart's B-frame turbochargers, ensuring a direct fit and proper sealing when installed. If you're building a custom turbo system or upgrading an existing one and need a reliable turbine housing that can handle serious boost, this Turbosmart unit is a solid option.