What does the .40 A/R ratio mean for my turbo?

The .40 A/R (Area/Radius) ratio on this turbine housing influences how quickly the turbocharger spools and its top-end power capability. A larger A/R like .40 generally leads to later spool but supports more top-end power by reducing exhaust backpressure.

What is the difference between an open and a divided turbine housing?

An open turbine housing allows exhaust gases from all exhaust ports to enter the turbine wheel simultaneously. This can affect the exhaust note and may offer different spool characteristics compared to a divided housing, which separates the exhaust pulses.

Is this turbine housing compatible with any GT55 turbocharger?

This housing is designed for specific Garrett GT55 series turbochargers. It is crucial to verify compatibility with your exact turbocharger model to ensure proper fitment and performance.

Garrett GT55 Turbine Housing Kit 1.40 A/R 761208-0017

Name: Garrett GT55 Turbine Housing Kit O/V 1.40 A/R
Brand: Garrett
SKU: garrett-garrett-gt55-turbine-housing-kit-o-v-1-40-a-r-t14-22827
Price: 924.15 USD
Availability: InStock

Garrett GT55 Turbine Housing Kit O/V 1.40 A/R

$924.15

Only 1 left in stock

Garrett GT55 Turbine Housing Kit O/V 1.40 A/R

Key Features

This kit includes the Garrett GT55 turbine housing.
Features an open .40 A/R (Area/Radius) ratio.
Designed for specific Garrett GT55 series turbochargers.
Constructed from durable materials to withstand high exhaust temperatures and pressures.
Not CARB approved; cannot ship to California.

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Product Details

This kit includes the Garrett GT55 turbine housing with an open .40 A/R ratio. This housing is designed to work with specific Garrett GT55 series turbochargers, helping to manage exhaust gas flow and determine the turbocharger's spool characteristics and top-end power potential. The open housing design can offer a different exhaust note compared to a divided housing.

Garrett is well-known for its forced induction components, and this turbine housing is built to handle the demands of high-performance applications. The .40 A/R (Area/Radius) ratio is a key specification that influences how quickly the turbocharger spools up and how much boost it can sustain at higher engine speeds. A larger A/R like this one generally means the turbo will spool a bit later but can support more top-end power by reducing exhaust backpressure. This housing is constructed from durable materials designed to withstand the high temperatures and pressures found in the exhaust stream of a turbocharged engine.

When considering a turbine housing upgrade or replacement, it's important to match it with the correct compressor housing and the overall needs of your engine build. This particular housing is not CARB approved and cannot be shipped to California. Always refer to your turbocharger manufacturer's specifications and consult with a performance specialist to ensure this housing is the right fit for your specific turbocharger model and performance goals.