How much power will the STR2C hold?

OS Giken USA rates the STR2C Clutch for GC8 Impreza at about 575 lb-ft of torque, and OS Giken Japan places the STR range in its 400 PS class. For more power than that, a higher capacity OS Giken series is the better match.

What does STR2C mean?

It is the OS Giken model code. STR is the cover series, 2 is the number of discs and C is the 215mm disc size. There is no D, so the discs have solid hubs for direct engagement. The same code system runs across the whole OS Giken clutch range.

Is the STR2C easy to drive on the street?

OS Giken designed the STR series to hold high capacity with a relatively light pedal, after its endurance racers asked for less pedal effort over long races. The damped hubs absorb drivetrain shock, and OS Giken USA recommends the STR range first for dual-purpose cars.

Can the STR2C Clutch for GC8 Impreza be rebuilt?

Yes. OS Giken sells Overhaul Kit A (SB031-BJ50A), with new discs, center plates, pressure plate and cover bolts, and Overhaul Kit B (SB031-BJ50B), which adds a new cover. Our team can order either kit when the clutch needs service. Kit B is the choice when the cover is also worn.

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Description

OS Giken STR2C Clutch for GC8 Impreza Subaru WRX STI EJ20, Twin Plate

OS Giken’s STR2C Clutch for GC8 Impreza models is the twin plate clutch from OS Giken’s STR series, built around two 215mm discs with solid hubs and an STR cover built to hold high capacity with a relatively light pedal. OS Giken USA rates it at about 575 lb-ft. OS Giken developed the STR series after its endurance racers asked for a lighter pedal, and OS Giken USA recommends it first for motorsport and dual-purpose cars.

Where It Sits in the Range

The STR2C Clutch for GC8 Impreza cars is one of several OS Giken clutches listed for the GC8 Impreza WRX STI. The R3C (about 1,100 lb-ft), R2CD (about 880 lb-ft) and TS2B (about 500 lb-ft) cover other points in the range, so the choice comes down to power, pedal feel and how the car is used.

How OS Giken Japan Lists It

OS Giken Japan lists the STR2C for the GC8 Impreza EJ20 turbo with the release conversion parts included.

Features

Two 215mm discs with solid hubs
STR cover built for a relatively light pedal
Rated by OS Giken USA at about 575 lb-ft
Rebuildable with OS Giken overhaul kits

Applications

Subaru Impreza WRX / STI: GC8 | 1992-2000 | 2.0L EJ20 turbo

Notes

OS Giken rebuild parts for this clutch are Overhaul Kit A (SB031-BJ50A) and Overhaul Kit B (SB031-BJ50B)
Installation labor is not included

Frequently Asked Questions

How much power will the STR2C hold? OS Giken USA rates the STR2C Clutch for GC8 Impreza at about 575 lb-ft of torque, and OS Giken Japan places the STR range in its 400 PS class. For more power than that, a higher capacity OS Giken series is the better match.
Who is the STR2C made for? OS Giken developed the STR series after its endurance racers asked for a lighter pedal, and OS Giken USA recommends it first for motorsport and dual-purpose cars. On the GC8 Impreza WRX STI it suits owners who want high capacity with a relatively light pedal for long sessions.
What does STR2C mean? It is the OS Giken model code. STR is the cover series, 2 is the number of discs and C is the 215mm disc size. There is no D, so the discs have solid hubs for direct engagement. The same code system runs across the whole OS Giken clutch range.
Is the STR2C easy to drive on the street? OS Giken designed the STR series to hold high capacity with a relatively light pedal, after its endurance racers asked for less pedal effort over long races. The damped hubs absorb drivetrain shock, and OS Giken USA recommends the STR range first for dual-purpose cars.
Can the STR2C Clutch for GC8 Impreza be rebuilt? Yes. OS Giken sells Overhaul Kit A (SB031-BJ50A), with new discs, center plates, pressure plate and cover bolts, and Overhaul Kit B (SB031-BJ50B), which adds a new cover. Our team can order either kit when the clutch needs service. Kit B is the choice when the cover is also worn.

About OS Giken

OS Giken was founded in Okayama, Japan in 1973 by Masaharu Okazaki. It built the TC16 and TC24-B1 DOHC cylinder heads for Nissan L-series engines, began making multi-plate racing clutches in 1982 and started supplying OEM limited-slip differentials in 1983. Development of the Super Lock LSD began in 1997, and of the OS-88 sequential gearbox for the Skyline GT-R in 1998.

Additional Information

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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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OS Giken STR2C Clutch for GC8 Impreza Subaru WRX STI EJ20, Twin Plate [SB031-BJ5]

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OS Giken STR2C Clutch for GC8 Impreza Subaru WRX STI EJ20, Twin Plate

Where It Sits in the Range

How OS Giken Japan Lists It

Features

Applications

Notes

Frequently Asked Questions

About OS Giken

Reviews