Does the Super Lock LSD for AP1 also fit the AP2?

Yes. OS Giken USA lists the Super Lock LSD for AP1 and AP2 cars, part number HA091-HA, for both generations of the S2000. The F20C AP1 and the F22C1 AP2 share the same rear differential layout, so one unit serves either car.

Why replace the factory Torsen in an S2000?

The S2000 exits slow corners in a low gear with little weight on the inside rear. A torque-sensing Torsen stops biasing torque once that wheel unloads, and the result is wheelspin. A clutch-type differential keeps transmitting torque through its plates, so the car drives out of the corner instead.

Is it good for drifting?

Yes. A clutch-type rear differential locks both wheels under power, which makes it easier to start and hold a slide than with the factory unit. OS Giken can retune initial torque and lock timing for a more aggressive drift setting.

Will it be noisy on the street?

OS Giken sets the Super Lock with a low preload that still reaches full lock progressively, and its Japanese catalogue describes the design as one of the quietest LSDs in town. Some plate engagement may be felt in very tight parking turns, which is normal for a clutch-type unit.

What maintenance does it need?

Change the differential oil more often than with the factory unit, using a gear oil intended for clutch-type LSDs, because the plates depend on it. When the plates eventually wear, OS Giken rebuilds and retunes Super Lock units in-house. That keeps the S2000 driving the same way for years.

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Description

OS Giken Super Lock LSD for AP1 / AP2 Honda S2000

OS Giken’s Super Lock LSD for AP1 / AP2 Honda S2000 replaces the factory Torsen with a clutch-type differential, the change that cures the S2000’s habit of spinning its inside rear tire out of slow corners. The F20C and F22C1 make their power above 6,000 rpm, so the car exits tight bends in a low gear with a lot of torque at the wheels and very little weight on the inside rear, which is where a torque-sensing unit gives up. OS Giken’s patented pressure ring keeps both tires driving instead. It is the upgrade for an S2000 used at autocross, time attack or drift practice.

Design and Performance

The friction plates sit on splines that pass through the side gears, which lets the case hold up to twice the plates of competing designs. That gives the unit enough clamping area to run a light preload on the road and still build smoothly to full lock under power. Gears are raw-forged and all parts are chemically heat treated in a billet-machined case.

Features

Clutch-type replacement for the factory Torsen
Patented pressure ring for progressive, predictable lock-up
Through-side-gear plate splines for up to twice the plate count
Light preload for a car still driven on the street
Raw-forged gears and a billet case
Retunable by OS Giken for initial torque and lock timing

Applications

Honda S2000: AP1 | 2000-2003 | 2.0L F20C
Honda S2000: AP2 | 2004-2009 | 2.2L F22C1

Notes

The Super Lock LSD for AP1 and AP2 cars is supplied as a complete differential unit; installation labor is not included
Use a gear oil intended for clutch-type limited-slip differentials

Frequently Asked Questions

Does the Super Lock LSD for AP1 also fit the AP2? Yes. OS Giken USA lists the Super Lock LSD for AP1 and AP2 cars, part number HA091-HA, for both generations of the S2000. The F20C AP1 and the F22C1 AP2 share the same rear differential layout, so one unit serves either car.
Why replace the factory Torsen in an S2000? The S2000 exits slow corners in a low gear with little weight on the inside rear. A torque-sensing Torsen stops biasing torque once that wheel unloads, and the result is wheelspin. A clutch-type differential keeps transmitting torque through its plates, so the car drives out of the corner instead.
Is it good for drifting? Yes. A clutch-type rear differential locks both wheels under power, which makes it easier to start and hold a slide than with the factory unit. OS Giken can retune initial torque and lock timing for a more aggressive drift setting.
Will it be noisy on the street? OS Giken sets the Super Lock with a low preload that still reaches full lock progressively, and its Japanese catalogue describes the design as one of the quietest LSDs in town. Some plate engagement may be felt in very tight parking turns, which is normal for a clutch-type unit.
What maintenance does it need? Change the differential oil more often than with the factory unit, using a gear oil intended for clutch-type LSDs, because the plates depend on it. When the plates eventually wear, OS Giken rebuilds and retunes Super Lock units in-house. That keeps the S2000 driving the same way for years.

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

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

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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OS Giken Super Lock LSD for AP1 / AP2 Honda S2000 [HA091-HA]

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OS Giken Super Lock LSD for AP1 / AP2 Honda S2000

Design and Performance

Features

Applications

Notes

Frequently Asked Questions

About OS Giken

Reviews