Do I need a twin-scroll manifold for this G30 Turbine Housing Kit?

Yes. The G30 Turbine Housing Kit in 1.06 A/R has a divided T4 inlet, built to keep the two scrolls of a twin-scroll manifold separate. Bolting it to a single-entry T4 manifold wastes the divided design, and a T3 or V-band manifold will not mate to it at all.

Which G30 cores does Garrett list for the divided housing?

All five standard-rotation G30 super cores: the G30-660, G30-770 and G30-900, plus the G-Series II G30-725 and G30-825. Every one uses the same 60mm inducer, 55mm exducer turbine wheel, which is why one housing covers outputs Garrett rates from 350 up to 900 horsepower.

How many wastegates will I need?

This is a free-float housing with no wastegate port, so boost control has to come from the manifold. Most twin-scroll manifolds are built with two external wastegates to keep the scrolls separated, though some use one. Follow the layout the manifold maker specifies and match the wastegate size to the power target.

Is 1.06 A/R large for a G30?

It sits toward the large end. Garrett offers G30 free-float housings from 0.61 to 1.21 A/R, and 1.06 favors high-rpm flow. The divided inlet recovers some of the response a large open housing would lose, which makes it a sound pick for a 3.0L to 3.5L engine aiming at the G30-900 rating.

Can I use it on a reverse rotation G30?

No. Garrett lists 740902-0092 for standard-rotation cores only and offers no divided T4 housing for reverse-rotation G30 cores. Reverse G30 builds choose from T3 or V-band inlet housings, which Garrett lists in 0.61 to 1.21 A/R under their own part numbers.

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Description

Garrett G30 Turbine Housing Kit, 1.06 A/R Divided T4 Free Float

Garrett’s G30 Turbine Housing Kit with a divided T4 inlet and 1.06 A/R is the twin-scroll exhaust housing for standard-rotation G30 cores, a stainless free-float casting that exits through a V-band outlet. It is the only divided housing Garrett lists for the G30 frame, and part 740902-0092 covers the G30-660, G30-770 and G30-900 as well as the G-Series II G30-725 and G30-825. Builders with a divided T4 manifold on a 2.5L to 3.5L engine get a housing that keeps the scrolls separate up to the turbine wheel. On a single-scroll T3 or V-band manifold it is the wrong part.

Divided Inlet

A divided T4 housing keeps the two exhaust pulse streams from a twin-scroll manifold apart until they reach the 60mm G30 turbine wheel, which is how twin-scroll systems recover pulse energy for response. The 1.06 A/R is generous for the frame, so the housing also flows well at high rpm. Boost control comes from external wastegates on the manifold.

Features

Divided T4 inlet flange for twin-scroll exhaust manifolds
V-band outlet to the downpipe
Free-float design with no internal wastegate
Stainless steel, rated by Garrett to 1050C (1922F)

Specifications

Garrett part number: 740902-0092
A/R: 1.06
Turbine inlet and outlet: T4 and V-band
Wastegate: External (free float)
Inlet: Divided
Rotation: Standard
Material: Stainless steel, rated to 1050C (1922F)

Applications

Garrett lists this G30 Turbine Housing Kit for these standard-rotation super cores, rated from 350 to 900 horsepower on 2.0L to 3.5L engines:

Garrett G30-660: 880693-5001S
Garrett G30-725 G-Series II: 934117-5001S
Garrett G30-770: 880693-5002S
Garrett G30-825 G-Series II: 934117-5002S
Garrett G30-900: 880693-5003S

Notes

An external wastegate is required, because this free-float housing has no wastegate port
The G30 super core is sold separately
Standard rotation; Garrett lists no reverse-rotation divided T4 housing for the G30
Garrett does not publish the contents of this turbine kit; contact us to confirm what ships before ordering

Frequently Asked Questions

Do I need a twin-scroll manifold for this G30 Turbine Housing Kit? Yes. The G30 Turbine Housing Kit in 1.06 A/R has a divided T4 inlet, built to keep the two scrolls of a twin-scroll manifold separate. Bolting it to a single-entry T4 manifold wastes the divided design, and a T3 or V-band manifold will not mate to it at all.
Which G30 cores does Garrett list for the divided housing? All five standard-rotation G30 super cores: the G30-660, G30-770 and G30-900, plus the G-Series II G30-725 and G30-825. Every one uses the same 60mm inducer, 55mm exducer turbine wheel, which is why one housing covers outputs Garrett rates from 350 up to 900 horsepower.
How many wastegates will I need? This is a free-float housing with no wastegate port, so boost control has to come from the manifold. Most twin-scroll manifolds are built with two external wastegates to keep the scrolls separated, though some use one. Follow the layout the manifold maker specifies and match the wastegate size to the power target.
Is 1.06 A/R large for a G30? It sits toward the large end. Garrett offers G30 free-float housings from 0.61 to 1.21 A/R, and 1.06 favors high-rpm flow. The divided inlet recovers some of the response a large open housing would lose, which makes it a sound pick for a 3.0L to 3.5L engine aiming at the G30-900 rating.
Can I use it on a reverse rotation G30? No. Garrett lists 740902-0092 for standard-rotation cores only and offers no divided T4 housing for reverse-rotation G30 cores. Reverse G30 builds choose from T3 or V-band inlet housings, which Garrett lists in 0.61 to 1.21 A/R under their own part numbers.

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 G30 Turbine Housing Kit, 1.06 A/R Divided T4 Free Float [740902-0092]

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Garrett G30 Turbine Housing Kit, 1.06 A/R Divided T4 Free Float

Divided Inlet

Features

Specifications

Applications

Notes

Frequently Asked Questions

About Garrett

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