How many cores fit the G42 Turbine Housing Kit?

Nine. Garrett lists this 1.01 A/R G42 Turbine Housing Kit for the G42-1200, G42-1200 Compact and G42-1450, the G-Series II G42-1325, G42-1325C and G42-1585, and the G-XRace GXR42-68, GXR42-71 and GXR42-72. All of them share an 82mm by 75mm turbine wheel, so this housing follows the owner through any core change.

Is the 1.01 A/R the quickest G42 housing?

Yes. The 1.01 is the smallest of the three G42 A/R sizes, so it builds exhaust velocity soonest and brings boost in earliest. It suits the lower half of the 2.0L to 7.0L range, while engines chasing peak power usually move up to the 1.15 or 1.28.

Can I swap from a G42 core to a GXR42 core and keep this housing?

Yes. Garrett states that when swapping between similar frame sizes such as G42 and GXR42, the original turbine housings interchange. The GXR42 product pages also say the cores use the same twin-scroll T4 and V-band turbine housings as the G-Series.

Does this housing need a twin-scroll manifold?

Yes. The T4 inlet is divided, so it needs a manifold with a matching divided T4 flange to work as intended. A manifold that ends in a single V-band collector pairs with the V-band inlet G42 housing, which Garrett makes in the same three A/R sizes.

Do I need an external wastegate?

Yes. Garrett lists every G42 turbine kit as free float, with no internal wastegate port in the housing. Boost is controlled by an external wastegate on the manifold, bought separately and sized for the boost target and the flow of the engine.

Description

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Description

Garrett G42 Turbine Housing Kit, 1.01 A/R T4 Divided Inlet V-Band Outlet

Garrett’s G42 Turbine Housing Kit in 1.01 A/R is the smallest twin-scroll housing for the G42 frame, stainless steel with a divided T4 inlet, a V-band outlet and no internal wastegate. Garrett lists it for nine cores across three generations, from the G42-1200 to the G-Series II G42-1585 and the G-XRace GXR42 family, which cover engines from 2.0L to 7.0L. This is the G42 housing for quick boost on a twin-scroll manifold, which suits a 3.0L six or a hard-revving four. A large V8 using a G42-1585 near its rating will want the 1.15 or 1.28 A/R.

Features

Divided T4 inlet for a twin-scroll manifold and V-band outlet for the downpipe
Free-float design for an external wastegate
Smallest of three A/R sizes in the G42 Turbine Housing Kit range

Specifications

Garrett part number: 757707-0014
A/R: 1.01
Turbine inlet and outlet: T4 divided and V-band
Divided inlet: Yes
Wastegate: External (free float)
Material: Stainless steel
Matching turbine wheel: 82mm inducer and 75mm exducer

Applications

Garrett lists this G42 Turbine Housing Kit for these super cores:

Garrett G42-1200: 860778-5004S super core, full-size compressor housing
Garrett G42-1200 Compact: 860778-5002S super core
Garrett G42-1325 G-Series II: 938339-5002S super core, 938338-5002S CHRA
Garrett G42-1325C Compact G-Series II: 938339-5001S super core, 938338-5001S CHRA
Garrett G42-1450: 860778-5006S super core
Garrett G42-1585 G-Series II: 938339-5003S super core, 938338-5003S CHRA
Garrett GXR42-68 G-XRace: 934173-5001S super core
Garrett GXR42-71 G-XRace: 952766-5006S super core
Garrett GXR42-72 G-XRace: 934173-5002S super core

Notes

An external wastegate is required, because this housing has no internal wastegate
The G42 or GXR42 super core is sold separately
Garrett publishes a maximum turbocharger speed for each core, from 109,000 rpm on the GXR42-68 and GXR42-72 to 120,000 rpm on the G-Series II cores and the GXR42-71; running above it is at the owner’s risk
Garrett also offers 1.15 and 1.28 A/R and V-band inlet versions
Garrett does not publish a hardware list for this kit; confirm clamps and gaskets before ordering

Frequently Asked Questions

How many cores fit the G42 Turbine Housing Kit? Nine. Garrett lists this 1.01 A/R G42 Turbine Housing Kit for the G42-1200, G42-1200 Compact and G42-1450, the G-Series II G42-1325, G42-1325C and G42-1585, and the G-XRace GXR42-68, GXR42-71 and GXR42-72. All of them share an 82mm by 75mm turbine wheel, so this housing follows the owner through any core change.
Is the 1.01 A/R the quickest G42 housing? Yes. The 1.01 is the smallest of the three G42 A/R sizes, so it builds exhaust velocity soonest and brings boost in earliest. It suits the lower half of the 2.0L to 7.0L range, while engines chasing peak power usually move up to the 1.15 or 1.28.
Can I swap from a G42 core to a GXR42 core and keep this housing? Yes. Garrett states that when swapping between similar frame sizes such as G42 and GXR42, the original turbine housings interchange. The GXR42 product pages also say the cores use the same twin-scroll T4 and V-band turbine housings as the G-Series.
Does this housing need a twin-scroll manifold? Yes. The T4 inlet is divided, so it needs a manifold with a matching divided T4 flange to work as intended. A manifold that ends in a single V-band collector pairs with the V-band inlet G42 housing, which Garrett makes in the same three A/R sizes.
Do I need an external wastegate? Yes. Garrett lists every G42 turbine kit as free float, with no internal wastegate port in the housing. Boost is controlled by an external wastegate on the manifold, bought separately and sized for the boost target and the flow of the engine.

About Garrett

Garrett Motion has turbocharged engines since 1955, when its T15 was matched to the Caterpillar D9 crawler, and in 1962 a Garrett turbocharger went into the Oldsmobile Jetfire Turbo Rocket, the first turbocharged production car. Garrett has supplied turbocharging in Formula 1 with Scuderia Ferrari, the FIA World Rally Championship and the 24 Hours of Le Mans. It has operated as a stand-alone company since 2018, and its technology is fitted to around 150 million vehicles worldwide.

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BP Pricing Difference

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Garrett G42 Turbine Housing Kit, 1.01 A/R T4 Divided Inlet V-Band Outlet [757707-0014]

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Garrett G42 Turbine Housing Kit, 1.01 A/R T4 Divided Inlet V-Band Outlet

Features

Specifications

Applications

Notes

Frequently Asked Questions

About Garrett

Reviews