Which engines suit a pair of 1.01 A/R G30 Turbine Housing Kits?

Larger twin-turbo engines, typically a V8 or a big V6, where each G30 sees enough exhaust to spool a 1.01 A/R without lag and the goal is power at high rpm. Smaller twin-turbo engines usually suit the 0.83 A/R G30 Turbine Housing Kit, which builds boost sooner on each bank.

Will a standard rotation G30 accept this housing?

No. Garrett lists 740902-0101 only for reverse-rotation G30 super cores, because its volute directs exhaust onto a wheel spinning in the reverse direction. Standard cores need the standard 1.01 A/R T3 housing, part 740902-0091, which shares the same flange layout.

Do both banks need the same A/R?

They should. When the two turbochargers see the same exhaust restriction they spool together and share the load evenly, which keeps boost control and calibration simple. Run this housing on the reverse bank and part 740902-0091 on the standard bank so both sides are 1.01 A/R on a T3 inlet.

How is boost controlled with this housing?

Through external wastegates, since a free-float housing has no wastegate port. Twin-turbo engines usually run a gate on each manifold, or one gate fed from a balance pipe, depending on the manifold design. Garrett offers its GVW range of external wastegates for these builds.

Does it fit the G-Series II reverse cores?

Yes. Garrett lists it for the reverse-rotation G30-725 and G30-825 G-Series II super cores, part numbers 934121-5001S and 934121-5002S, alongside the first-generation reverse G30-660, G30-770 and G30-900. G-Series II kept the first-generation turbine housings, so no housing change is needed on upgrade.

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Description

Garrett G30 Turbine Housing Kit, 1.01 A/R T3 Free Float Reverse Rotation

Garrett’s G30 Turbine Housing Kit in reverse rotation, 1.01 A/R with a T3 inlet, is the larger T3 housing for reverse-spinning G30 cores, free float with a V-band outlet. Garrett lists part 740902-0101 for the reverse G30-660, G30-770 and G30-900 and the G-Series II G30-725 and G30-825. It belongs on the mirrored bank of a twin-turbo engine built on T3 manifolds where each turbocharger has to flow hard at high rpm, paired with the standard 1.01 A/R T3 housing, part 740902-0091. For a twin setup that prizes early boost, the 0.83 A/R reverse T3 housing is the better match.

Twin-Turbo Flow

On a twin-turbo engine each G30 handles only half the exhaust, so the bigger 1.01 A/R mainly suits large-displacement engines or high power targets. The reverse volute lets the second turbocharger mirror the first, keeping both banks symmetrical. Boost is held by external wastegates, and the stainless casting carries Garrett’s 1050C (1922F) rating.

Features

Reverse-rotation 1.01 A/R volute
T3 inlet and V-band outlet
Free-float layout for external wastegate control

Specifications

Garrett part number: 740902-0101
A/R: 1.01
Turbine inlet and outlet: T3 and V-band
Wastegate: External (free float)
Rotation: Reverse
Material: Stainless steel, rated to 1050C (1922F)

Applications

Garrett lists this G30 Turbine Housing Kit for these reverse-rotation super cores:

Garrett G30-660 Reverse Rotation: 880694-5001S
Garrett G30-725 G-Series II Reverse Rotation: 934121-5001S
Garrett G30-770 Reverse Rotation: 880694-5002S
Garrett G30-825 G-Series II Reverse Rotation: 934121-5002S
Garrett G30-900 Reverse Rotation: 880694-5003S

Notes

An external wastegate is required, because this free-float housing has no wastegate port
The reverse-rotation G30 super core is sold separately
Reverse rotation only; the standard-rotation 1.01 A/R T3 housing is part 740902-0091
Garrett also offers a reverse-rotation T3 housing in 0.83 A/R, part 740902-0100

Frequently Asked Questions

Which engines suit a pair of 1.01 A/R G30 Turbine Housing Kits? Larger twin-turbo engines, typically a V8 or a big V6, where each G30 sees enough exhaust to spool a 1.01 A/R without lag and the goal is power at high rpm. Smaller twin-turbo engines usually suit the 0.83 A/R G30 Turbine Housing Kit, which builds boost sooner on each bank.
Will a standard rotation G30 accept this housing? No. Garrett lists 740902-0101 only for reverse-rotation G30 super cores, because its volute directs exhaust onto a wheel spinning in the reverse direction. Standard cores need the standard 1.01 A/R T3 housing, part 740902-0091, which shares the same flange layout.
Do both banks need the same A/R? They should. When the two turbochargers see the same exhaust restriction they spool together and share the load evenly, which keeps boost control and calibration simple. Run this housing on the reverse bank and part 740902-0091 on the standard bank so both sides are 1.01 A/R on a T3 inlet.
How is boost controlled with this housing? Through external wastegates, since a free-float housing has no wastegate port. Twin-turbo engines usually run a gate on each manifold, or one gate fed from a balance pipe, depending on the manifold design. Garrett offers its GVW range of external wastegates for these builds.
Does it fit the G-Series II reverse cores? Yes. Garrett lists it for the reverse-rotation G30-725 and G30-825 G-Series II super cores, part numbers 934121-5001S and 934121-5002S, alongside the first-generation reverse G30-660, G30-770 and G30-900. G-Series II kept the first-generation turbine housings, so no housing change is needed on upgrade.

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 G30 Turbine Housing Kit, 1.01 A/R T3 Free Float Reverse Rotation [740902-0101]

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Garrett G30 Turbine Housing Kit, 1.01 A/R T3 Free Float Reverse Rotation

Twin-Turbo Flow

Features

Specifications

Applications

Notes

Frequently Asked Questions

About Garrett

Reviews