What does the GBC37-900 Super Core include?

The GBC37-900 Super Core is the center housing rotating assembly with the 0.72 A/R compressor housing fitted. The turbine housing is a separate purchase, and Garrett lists three for this core: 0.82 A/R T3, 0.82 A/R T4 and 0.95 A/R divided T4. All three are free float and need an external wastegate.

How much horsepower is the GBC37-900 rated for?

Garrett rates the GBC37-900 at 450 to 900 horsepower on engines from 2.0L to 5.5L, with up to 87 lbs/min of airflow. Garrett calculates that figure from compressor choke flow, so it represents potential flywheel horsepower, and the engine, fuel system and tune decide how much of it is reached.

Is this core water cooled?

No. Garrett describes the GBC37-900 center housing as oil cooled, so the installation needs an oil feed and drain but no coolant lines. That simplifies plumbing on engines where routing water to the turbocharger is awkward, which suits many swap and custom manifold builds.

GBC37-900 or GBC35-700: which should I choose?

Choose by power target. The GBC35-700 covers 400 to 700 horsepower with a 58mm inducer, while the GBC37-900 steps up to a 67mm inducer for 450 to 900 horsepower. If the goal is above roughly 700 horsepower the GBC37-900 is the core with headroom; below that the smaller core usually spools sooner.

Is the GBC37-900 Super Core a G-Series G37?

No. Turn 14 calls it the G37-900, but Garrett names it the GBC37-900 Super Core and places it in the Garrett Boost Club Line, a journal bearing family. G-Series turbochargers use ball bearing cartridges and different turbine housings, so parts are not shared between the two ranges.

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Description

Garrett GBC37-900 Super Core, 67mm Journal Bearing

Garrett’s GBC37-900 Super Core is the largest core in the Garrett Boost Club Line: a 67mm billet compressor wheel spinning on a journal bearing rotating group, rated by Garrett for 450 to 900 horsepower on engines from 2.0L to 5.5L. It is aimed at a V8 or a large six that needs serious airflow on a sensible budget. A 2.0L engine can run it, but only when the target sits near the top of that range; for a build that stops well short of 700 horsepower the GBC35-700 will feel more alert. Garrett supplies it without a turbine housing.

Compressor and Turbine

The 64 trim compressor wheel is forged and fully machined, with an extended tip design for higher pressure ratios, and Garrett quotes up to 87 lbs/min of airflow at a pressure ratio up to 4.0. The turbine side uses a 73mm inducer and an Inconel wheel. GBC37 turbine housings are offered in T3 open, T4 open and T4 divided inlets, each with a 90mm V-band outlet.

Features

Latest generation journal bearing rotor group with a 360-degree thrust bearing
Oil-cooled center housing, with no water lines to plumb
Shares its outline with the GBC35-700, the smaller Boost Club Line core
Machined boost signal port with the plug installed

Specifications

Compressor inducer and exducer: 67mm and 84mm
Compressor trim: 64
Compressor housing A/R: 0.72
Turbine inducer and exducer: 73mm and 65mm
Turbine trim: 80
Rotation: Standard

Applications

The GBC37-900 Super Core is not vehicle specific. Garrett sizes it by engine and output:

Engine displacement: 2.0L to 5.5L
Power range: 450 to 900 horsepower (Garrett rating)
Garrett GBC37 turbine kits: 0.82 A/R T3, 0.82 A/R T4 and 0.95 A/R divided T4, all free float with a V-band outlet

Notes

The turbine housing is not included and must be one of the three GBC37 free-float housings Garrett lists
An external wastegate is required with every GBC37 housing
Turn 14 lists this part as the G37-900; Garrett names it GBC37-900, a journal bearing core that is not part of the ball bearing G-Series
Turn 14 shows this core as a special order item with a lead time

Frequently Asked Questions

What does the GBC37-900 Super Core include? The GBC37-900 Super Core is the center housing rotating assembly with the 0.72 A/R compressor housing fitted. The turbine housing is a separate purchase, and Garrett lists three for this core: 0.82 A/R T3, 0.82 A/R T4 and 0.95 A/R divided T4. All three are free float and need an external wastegate.
How much horsepower is the GBC37-900 rated for? Garrett rates the GBC37-900 at 450 to 900 horsepower on engines from 2.0L to 5.5L, with up to 87 lbs/min of airflow. Garrett calculates that figure from compressor choke flow, so it represents potential flywheel horsepower, and the engine, fuel system and tune decide how much of it is reached.
Is this core water cooled? No. Garrett describes the GBC37-900 center housing as oil cooled, so the installation needs an oil feed and drain but no coolant lines. That simplifies plumbing on engines where routing water to the turbocharger is awkward, which suits many swap and custom manifold builds.
GBC37-900 or GBC35-700: which should I choose? Choose by power target. The GBC35-700 covers 400 to 700 horsepower with a 58mm inducer, while the GBC37-900 steps up to a 67mm inducer for 450 to 900 horsepower. If the goal is above roughly 700 horsepower the GBC37-900 is the core with headroom; below that the smaller core usually spools sooner.
Is the GBC37-900 Super Core a G-Series G37? No. Turn 14 calls it the G37-900, but Garrett names it the GBC37-900 Super Core and places it in the Garrett Boost Club Line, a journal bearing family. G-Series turbochargers use ball bearing cartridges and different turbine housings, so parts are not shared between the two ranges.

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 GBC37-900 Super Core, 67mm Journal Bearing [913840-5002S]

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Garrett GBC37-900 Super Core, 67mm Journal Bearing

Compressor and Turbine

Features

Specifications

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Notes

Frequently Asked Questions

About Garrett

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