OS Giken
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OS Giken 07/01 - 09/04 Honda DC5 Integra K20A (MT Only) Super Lock LSD
By: OS Giken | PN: HA081-HAOur Price: $1,450.00
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OS Giken 05/93 - 07/01 Honda EK9 Civic B16B / DC2 Integra B18C (MT Only) Super Lock LSD
By: OS Giken | PN: HA052-HAOur Price: $1,450.00
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OS Giken Toyota TOYOTA SUPRA 2JZGTE Clutch Alignment Tool
By: OS Giken | PN: TY031-EBOur Price: $80.00
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OS Giken Mitsubishi LANCER EVO 10 CZ4A TR Series Twin Plate Clutch - Requires MT071-BF50M
By: OS Giken | PN: Notes: TR Series Clutch; Aluminum Cover Twin Plate; Flywheel Bolts Included; Use Mitsubishi OEM Part Number [MD725220] or Mazda FC3S Mainshaft as Alignment ToolOur Price: $1,660.00
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OS Giken Nissan 240SX S13/S14 KA24DE (MT Only) Super Lock LSD
By: OS Giken | PN: NS046-HAOur Price: $1,450.00
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OS Giken Nissan 350Z VQ35DE:NEO R Series Triple Plate w/Floating Center Hub Clutch
By: OS Giken | PN: NS111-CH5Our Price: $2,120.00
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OS Giken Nissan 240Z HR30 - GC10 Super Single Alum Dampened Single Plate Clutch
By: OS Giken | PN: NS081-AB8Our Price: $1,150.00
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OS Giken Toyota Supra JZA80 (6MT / 9 in) Super Lock LSD
By: OS Giken | PN: TY033-HAOur Price: $1,520.00
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OS Giken Toyota SUPRA 1JZGTE TR Series Dampened Twin Plate Clutch - Requires TY021-BF60M
By: OS Giken | PN: TY021-BF6Our Price: $1,720.00
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OS Giken Toyota SUPRA 2JZGTE R Series Triple Plate w/Floating Center Hub Clutch - Req. TY031-CH50M
By: OS Giken | PN: TY031-CH5Our Price: $2,120.00
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OS Giken Toyota JZA80 2JZGTE OS Flywheel Bolt Set (Set of 8)
By: OS Giken | PN: TY031-E000LOur Price: $70.00
About OS Giken

The TC16-MA2 twin cam head for Datsun L-series was designed in 1974 and successfully campaigned on the international rally and circuit racing scene; on the streets of Japan it ruled as king and was virtually untouchable. Producing 230+hp naturally aspirated (quite a feat for 4-cylinder engines in Japan during that time), a very limited number of units were produced to supply various Datsun race teams. The 6-cylinder version (TC24-B1) followed shortly thereafter, with a specific target of outperforming the fastest production car of the time, the Porsche 930 turbo. Featuring twin cams, pent-roof combustion chambers, and 24-valves., power output was in the 320+hp range (about double the power output of the OEM L28 motor).
With the amount of power the OS built motors were generating, no clutches available at the time were able to sufficiently transfer power down the driveline, so Mr. Okazaki took the initiative to analyze what was available and redesign something to improve performance and durability. The end result was the Racing Line of OS Giken clutches: smaller disk diameter, lighter assembly weight, increased durability/power capacity with decreased pedal pressure. OS clutches have since become a major part of the product lineup, with new improvements being developed and tested continually.
The next weak link for high performance applications proved to be the transmission, so once again OS set out to improve on components already available in the market. OS gear kits are designed to optimize the gear ratios for sports/race driving, but with the knowledge and experience garnered from years of manufacturing, power capacity also increased immensely, furthering OS' reputation for producing extremely durable components.
As time passed and technology progressed, the need for a better limited-slip differential presented itself and once again OS set out on a mission to "build a better mousetrap". The clutch-type LSD's popular at the time served their purpose, but were commonly known to require regular maintenance/service, performed inconsistently, were noisy, and not comfortable for normal street driving. Just as he had done with engine, clutch, and gear development, Mr. Okazaki came up with a completely new design with the purpose of eliminating all the shortfalls of parts available at the time. The end result of his efforts resulted in the Lock Timing Control System and Spline-Through Side Gear designs, which were patented and implemented into the all-new Superlock LSD, a revolution in limited-slip technology that could offer all the benefits of a limited-slip differential without the shortfalls inherent with other products offered from competitors.
From Mr. Okazaki's humble beginnings tinkering with motorcycle parts at home, OS Giken has evolved and grown over the years, building and cementing a reputation as one of the best racing drivetrain parts manufacturers in the world. Officially founded in 1973, the company headquarters and factory are located in Okayama, Japan. All OS Giken parts are 100% manufactured and assembled in Japan, under very strict quality-control guidelines. Production and design capabilities for engine and drivetrain components are OS Giken's specialty, but the company has the ability to design and build just about anything mechanical. As the design, construction, and usage of the automobile evolves, OS Giken looks forward to the challenges presented to find room for improvement!