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

The A/R ratio, standing for Area/Radius, determines how much exhaust gas flows through the turbine housing. A higher A/R like 1.15 allows for more flow at higher engine speeds, which can help reduce backpressure and improve top-end power.

What is the benefit of a divided turbine housing inlet?

A divided inlet separates exhaust pulses from different cylinder banks. This helps maintain exhaust gas velocity, which can lead to quicker turbo spool and reduced exhaust manifold reversion, especially in V-engine configurations.

Is this turbine housing compatible with all GT42 turbos?

This housing is specifically designed for the GT42 and GT42R series turbochargers and features an 84mm inlet. It's crucial to verify that this specific inlet size and A/R ratio match your turbocharger's wheel specifications and your engine's performance goals.

Garrett GT42/42R Turbine Housing 1.15 A/R 757707-0002

Name: Garrett GT42/42R Turbine Housing Kit Div 1.15 A/R in84in
Brand: Garrett
SKU: garrett-garrett-gt42-42r-turbine-housing-kit-div-1-15-a-r-in84in-t14-22817
Price: 507.67 USD
Availability: BackOrder

Garrett GT42/42R Turbine Housing Kit Div 1.15 A/R in84in

$507.67

On Backorder

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

Garrett GT42/42R Turbine Housing Kit Div 1.15 A/R in84in

Key Features

Fits Garrett GT42 and GT42R series turbochargers.
Features a 1.15 A/R ratio for optimized exhaust flow at higher RPMs.
Includes an 84mm inlet for specific wheel and compressor matching.
Divided inlet design helps maintain exhaust gas velocity and improve spool.
Constructed from durable cast iron to handle high temperatures and pressures.
Not CARB approved; cannot ship to California.

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Product Details

This Garrett turbine housing kit features a 1.15 A/R ratio and an 84mm inlet, designed for the GT42 and GT42R series turbochargers. The A/R ratio, which stands for Area/Radius, dictates the flow rate of exhaust gases through the turbine housing. A higher A/R like 1.15 generally means more exhaust flow capacity, which can help reduce backpressure at higher engine speeds and allow the turbo to spool more effectively in the upper RPM range. This makes it a good choice for builds focused on high-end power output.

Constructed from durable cast iron, this housing is built to withstand the extreme temperatures and pressures associated with forced induction systems. The divided inlet design is crucial for performance applications, as it separates the exhaust pulses from each cylinder bank. This separation helps to maintain exhaust gas velocity, which can improve turbocharger spool response and reduce exhaust manifold reversion. The 84mm inlet size is specific to certain turbocharger compressor and turbine wheel combinations within the GT42/42R family, ensuring proper fitment and flow matching.

This kit is intended for custom turbocharger setups where precise control over exhaust flow and spool characteristics is desired. It's important to note that this part is not CARB approved and cannot be shipped to California due to emissions regulations. Always consult your turbocharger manufacturer's specifications to ensure this housing is the correct match for your specific turbocharger and engine build.