What does the '1.28 A/R' mean for my turbo's performance?

The A/R ratio (Area/Radius) indicates the size of the turbine housing's volute. A 1.28 A/R is a larger housing, which generally supports higher exhaust flow and can lead to improved top-end power, but might slightly increase turbo lag compared to a smaller A/R.

What is a 'T4 divided' inlet flange?

A T4 divided inlet means the housing has an internal divider that separates the exhaust gases from two ports on your exhaust manifold. This separation helps manage exhaust pulses, potentially leading to quicker turbo spool and more efficient operation.

What kind of turbochargers is this housing designed for?

This housing is intended for turbochargers that utilize a 70mm turbine wheel inducer diameter and require a T4 divided turbine inlet flange. It's crucial to match this housing to your specific turbocharger's specifications for optimal performance and fit.

Turbosmart Turbine Housing T4 Divided 1.28AR TS-19TH70C-D412

Name: Turbosmart Turbine Housing (70mm) T4 Divided 1.28AR
Brand: Turbosmart
SKU: turbosmart-turbosmart-turbine-housing-70mm-t4-divided-1-28ar-t14-960296
Price: 551.69 USD
Availability: BackOrder

Turbosmart Turbine Housing (70mm) T4 Divided 1.28AR

$551.69

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 Turbine Housing (70mm) T4 Divided 1.28AR

Key Features

Fits turbochargers with a 70mm turbine wheel inducer diameter.
Features a T4 divided turbine inlet flange for improved exhaust pulse separation and spool.
Includes a 1.28 A/R ratio, supporting higher exhaust flow for increased top-end power.
Constructed from durable cast iron to withstand high engine temperatures and boost pressures.
Designed for custom turbo builds and performance upgrades.
Not CARB approved; cannot ship to California.

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Product Details

If you're building a custom turbo system or upgrading an existing one, getting the turbine housing right is key to performance. This Turbosmart 70mm turbine housing uses a T4 divided inlet flange and a 1.28 A/R ratio, making it suitable for a wide range of performance applications where you need good flow and responsiveness.

The divided housing design helps separate the exhaust pulses from each cylinder, which can improve spool-up speed and reduce turbo lag. The 1.28 A/R (Area/Radius) ratio is on the larger side, meaning it's designed to support higher exhaust flow rates. This generally translates to better top-end power, especially when paired with a turbocharger that can take advantage of it. Turbosmart is known for well-built components, and this housing is no exception, crafted from durable cast iron to handle the heat and pressure of boosted engines.

This housing is designed to fit turbochargers with a 70mm inducer diameter and a T4 divided turbine inlet. It's important to ensure your turbo's turbine wheel dimensions and exhaust manifold flange match these specifications for a proper fit. Keep in mind this part is not CARB approved and cannot be shipped to California. Always consult your turbo manufacturer's specifications to confirm compatibility with your specific turbocharger and build goals.