Which cores does the G38 Turbine Housing Kit fit?

Garrett lists the 0.85 A/R divided G38 Turbine Housing Kit for two super cores: the G-Series II G38-1000, part 938272-5003S, and the G-XRace GXR38-64, sold as 934173-5008S with a V-band compressor outlet or 934173-5009S with a hose outlet. Both spin a turbine wheel with a 66mm exducer.

Do I need a twin-scroll manifold for this housing?

Yes. The divided T4 inlet only pays off when the manifold keeps its two runner groups separate all the way to the flange. On a single-entry manifold with a V-band collector, the V-band inlet version of this G38 housing is the correct part and avoids an adapter.

Is 0.85 A/R the right size for my engine?

It is the response choice. Of the 0.85, 0.95 and 1.06 A/R G38 housings, the 0.85 brings the turbine up to speed earliest and suits the smaller end of the 2.0L to 5.5L range or a build that values midrange torque. Larger engines aimed at peak power usually step up to 0.95 or 1.06.

Does this housing include a wastegate?

No. It is a free-float housing with no internal wastegate port or flapper, so an external wastegate mounted on the exhaust manifold has to control boost. The manifold therefore needs a wastegate flange ahead of the turbine inlet, and the gate itself is bought separately.

How much power can a G38 build make with this housing?

Garrett rates the G38-1000 at 500 to 1000 horsepower and the GXR38-64 at 500 to 1150 horsepower. Those figures come from compressor choke flow and represent potential flywheel horsepower. A small 0.85 A/R housing trades some of that top end for quicker boost, so it rarely suits a build aimed at the ceiling.

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Description

Garrett G38 Turbine Housing Kit, 0.85 A/R T4 Divided Inlet V-Band Outlet

Garrett’s G38 Turbine Housing Kit in 0.85 A/R is the smallest of the three exhaust housings Garrett offers for its G38 frame, cast in stainless steel with a divided T4 inlet, a V-band outlet and no internal wastegate. Garrett lists it for the G-Series II G38-1000 and the G-XRace GXR38-64 super cores, which cover engines from 2.0L to 5.5L. The tight A/R and twin-scroll inlet favor boost response, so it suits a smaller engine on a divided T4 manifold. A large engine chasing the top of the GXR38-64 rating will run short of exhaust flow sooner here than in the 1.06 A/R.

Construction

Garrett casts the G38 housings in stainless steel and offers each A/R with either a divided T4 or a V-band inlet. This version keeps the two inlet passages separate up to the turbine, around a wheel with a 74mm inducer and 66mm exducer on both listed cores.

Features

Divided T4 inlet flange for a twin-scroll manifold, with a V-band joint at the outlet
Free-float design, so boost is held by an external wastegate on the manifold
The smallest A/R in the G38 Turbine Housing Kit range, chosen for response

Specifications

Garrett part number: 757707-0042
A/R: 0.85
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 lists this G38 Turbine Housing Kit for these super cores:

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
The same housing is offered in 0.95 and 1.06 A/R, and with a V-band inlet
Garrett does not publish a hardware list for this kit; confirm clamps and gaskets before ordering

Frequently Asked Questions

Which cores does the G38 Turbine Housing Kit fit? Garrett lists the 0.85 A/R divided G38 Turbine Housing Kit for two super cores: the G-Series II G38-1000, part 938272-5003S, and the G-XRace GXR38-64, sold as 934173-5008S with a V-band compressor outlet or 934173-5009S with a hose outlet. Both spin a turbine wheel with a 66mm exducer.
Do I need a twin-scroll manifold for this housing? Yes. The divided T4 inlet only pays off when the manifold keeps its two runner groups separate all the way to the flange. On a single-entry manifold with a V-band collector, the V-band inlet version of this G38 housing is the correct part and avoids an adapter.
Is 0.85 A/R the right size for my engine? It is the response choice. Of the 0.85, 0.95 and 1.06 A/R G38 housings, the 0.85 brings the turbine up to speed earliest and suits the smaller end of the 2.0L to 5.5L range or a build that values midrange torque. Larger engines aimed at peak power usually step up to 0.95 or 1.06.
Does this housing include a wastegate? No. It is a free-float housing with no internal wastegate port or flapper, so an external wastegate mounted on the exhaust manifold has to control boost. The manifold therefore needs a wastegate flange ahead of the turbine inlet, and the gate itself is bought separately.
How much power can a G38 build make with this housing? Garrett rates the G38-1000 at 500 to 1000 horsepower and the GXR38-64 at 500 to 1150 horsepower. Those figures come from compressor choke flow and represent potential flywheel horsepower. A small 0.85 A/R housing trades some of that top end for quicker boost, so it rarely suits a build aimed at the ceiling.

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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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, 0.85 A/R T4 Divided Inlet V-Band Outlet [757707-0042]

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Garrett G38 Turbine Housing Kit, 0.85 A/R T4 Divided Inlet V-Band Outlet

Construction

Features

Specifications

Applications

Notes

Frequently Asked Questions

About Garrett

Reviews