Who should choose the 1.06 A/R G38 Turbine Housing Kit?

Builders after peak power. The 1.06 A/R G38 Turbine Housing Kit has the most exhaust flow of the three G38 sizes, so it suits larger engines toward 5.5L or engines that rev hard. The trade is later boost onset than the 0.85 or 0.95 A/R housings, which matters most on small displacement.

How much horsepower do the matching G38 cores support?

The G38-1000 carries a Garrett rating of 500 to 1000 horsepower, and the GXR38-64 is rated at 500 to 1150. Garrett calculates those ratings from compressor choke flow, so they describe potential flywheel horsepower. The large 1.06 A/R housing is the one to pair with a build aimed at the upper part of that range.

Will this housing fit my twin-scroll manifold?

Yes, if the manifold ends in a divided T4 flange. This housing has a T4 twin-scroll inlet and a V-band outlet. A manifold with a single V-band collector needs the V-band inlet version instead, which Garrett offers in the same three A/R sizes.

Do I need an external wastegate?

Yes. Garrett lists every G38 turbine kit with an external wastegate, and this housing has no internal port or actuator. Boost is controlled by a separate wastegate plumbed into the manifold, which also lets the builder size the gate for the flow a large-housing setup needs.

Is the turbine wheel included with the housing?

No. The turbine wheel lives in the center section, which comes as part of the G38-1000 or GXR38-64 super core. This kit is the outer turbine housing only. The super core is sold separately so the builder can match it to this 1.06 A/R housing or a smaller one.

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Description

Garrett G38 Turbine Housing Kit, 1.06 A/R T4 Divided Inlet V-Band Outlet

Garrett’s G38 Turbine Housing Kit in 1.06 A/R is the largest G38 exhaust housing, with a divided T4 inlet, a V-band outlet and a free-float layout for external wastegate control, cast in stainless steel. Garrett lists it for the G38-1000 and the GXR38-64, the second rated to 1150 horsepower. This is the housing for a larger engine near the 5.5L end of the G38 range, or a high-revving build where exhaust backpressure limits power. On a small four-cylinder that wants boost early in the rev range it is too large, and the 0.85 A/R is the better match.

Features

Largest A/R Garrett offers in the G38 Turbine Housing Kit range
Divided T4 inlet for a twin-scroll manifold and a V-band outlet joint
No internal wastegate, for builds with an external gate on the manifold
Fits the turbine wheel with a 74mm inducer and 66mm exducer used on both G38 cores

Specifications

Garrett part number: 757707-0044
A/R: 1.06
Turbine inlet and outlet: T4 divided and V-band
Divided inlet: Yes
Wastegate: External (free float)
Material: Stainless steel
Matching turbine wheel: 74mm inducer and 66mm exducer

Applications

Garrett pairs this G38 Turbine Housing Kit with:

Garrett G38-1000 G-Series II: 938272-5003S super core
Garrett GXR38-64 G-XRace: 934173-5008S super core with V-band compressor outlet, 934173-5009S with hose outlet

Notes

An external wastegate is required, because this housing has no internal wastegate
The G38-1000 or GXR38-64 super core is sold separately
Garrett sets the maximum turbocharger speed of both listed cores at 125,000 rpm and states that running above it is at the owner’s risk
Smaller A/R and V-band inlet versions are listed under G38 turbine housings
Garrett does not publish a hardware list for this kit; confirm clamps and gaskets before ordering

Frequently Asked Questions

Who should choose the 1.06 A/R G38 Turbine Housing Kit? Builders after peak power. The 1.06 A/R G38 Turbine Housing Kit has the most exhaust flow of the three G38 sizes, so it suits larger engines toward 5.5L or engines that rev hard. The trade is later boost onset than the 0.85 or 0.95 A/R housings, which matters most on small displacement.
How much horsepower do the matching G38 cores support? The G38-1000 carries a Garrett rating of 500 to 1000 horsepower, and the GXR38-64 is rated at 500 to 1150. Garrett calculates those ratings from compressor choke flow, so they describe potential flywheel horsepower. The large 1.06 A/R housing is the one to pair with a build aimed at the upper part of that range.
Will this housing fit my twin-scroll manifold? Yes, if the manifold ends in a divided T4 flange. This housing has a T4 twin-scroll inlet and a V-band outlet. A manifold with a single V-band collector needs the V-band inlet version instead, which Garrett offers in the same three A/R sizes.
Do I need an external wastegate? Yes. Garrett lists every G38 turbine kit with an external wastegate, and this housing has no internal port or actuator. Boost is controlled by a separate wastegate plumbed into the manifold, which also lets the builder size the gate for the flow a large-housing setup needs.
Is the turbine wheel included with the housing? No. The turbine wheel lives in the center section, which comes as part of the G38-1000 or GXR38-64 super core. This kit is the outer turbine housing only. The super core is sold separately so the builder can match it to this 1.06 A/R housing or a smaller one.

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.

Additional Information

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Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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Garrett G38 Turbine Housing Kit, 1.06 A/R T4 Divided Inlet V-Band Outlet [757707-0044]

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Garrett G38 Turbine Housing Kit, 1.06 A/R T4 Divided Inlet V-Band Outlet

Features

Specifications

Applications

Notes

Frequently Asked Questions

About Garrett

Reviews