When is a 1.5-Way Super Lock LSD the right choice?

Choose the 1.5-Way Super Lock LSD when the car needs stability under braking and on corner entry but the driver still wants the car to turn in freely. It is the more common choice for road courses, where a 2-way can make the car push on entry into slow and medium corners.

What is the difference between 1.5-way and 2-way?

A 1.5-way differential locks fully under acceleration and partially on deceleration. A 2-way locks equally in both directions. The 2-way gives maximum stability when trail braking hard, while the 1.5-way balances that stability with easier rotation on corner entry, which many drivers find quicker over a lap.

Does it work with any final drive ratio in the quick change?

The differential sits independently of the quick-change gears, so changing ratios between sessions does not affect it. That is one reason a tunable clutch-type LSD pairs well with a quick change: gearing and locking can each be set for the circuit.

Can OS Giken tune it for a specific car?

Yes. OS Giken retunes Super Lock units in-house. Cone springs set initial torque, pressure ring springs set how quickly full lock arrives, and the pressure ring and iron cross set the ramp angles, so the differential can be matched to car weight, power and track.

How often does it need servicing?

On a race car the friction plates wear with use, and the right interval depends on power, track and how hard the car is driven. Inspect the unit with the regular rear end service, and OS Giken can rebuild it with new plates when needed.

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Description

OS Giken 1.5-Way Super Lock LSD for Winters Quick Change IRS 10in 35-Spline

OS Giken’s 1.5-Way Super Lock LSD for Winters Quick Change IRS 10in 35-Spline brings the Japanese clutch-type differential to one of the most common independent rear quick-change housings in American road racing and purpose-built race cars. A quick-change rear end lets a crew swap final drive ratios between sessions, and pairing it with a tunable plate-type LSD means the differential can be set for the circuit as precisely as the gearing. The 1.5-way action locks fully on throttle and partially on deceleration, which steadies the car on corner entry without the push of a 2-way. It suits sports racers, road-race specials and time attack builds running the Winters 10-inch IRS.

Choosing 1.5-Way or 2-Way

OS Giken offers this housing in two actions. The 1.5-way unit adds partial locking on deceleration for stability under braking while keeping turn-in free. The 2-way version locks equally on and off throttle, which suits drivers who want maximum stability and are used to trail-braking a tightly locked car.

Features

1.5-way action: full lock on throttle, partial on deceleration
Built for the Winters quick change 10-inch IRS
Sized for 35-spline axle shafts
Patented OS Giken pressure ring for progressive lock
Up to twice the friction plates of competing designs
Retunable by OS Giken for each circuit

Applications

Winters Quick Change IRS: 10-inch, 35-spline axles

Notes

This 1.5-Way Super Lock LSD fits the Winters quick change 10-inch IRS with 35-spline axles; a 2-way version is listed separately
Confirm the housing and spline count before ordering
Installation labor is not included

Frequently Asked Questions

When is a 1.5-Way Super Lock LSD the right choice? Choose the 1.5-Way Super Lock LSD when the car needs stability under braking and on corner entry but the driver still wants the car to turn in freely. It is the more common choice for road courses, where a 2-way can make the car push on entry into slow and medium corners.
What is the difference between 1.5-way and 2-way? A 1.5-way differential locks fully under acceleration and partially on deceleration. A 2-way locks equally in both directions. The 2-way gives maximum stability when trail braking hard, while the 1.5-way balances that stability with easier rotation on corner entry, which many drivers find quicker over a lap.
Does it work with any final drive ratio in the quick change? The differential sits independently of the quick-change gears, so changing ratios between sessions does not affect it. That is one reason a tunable clutch-type LSD pairs well with a quick change: gearing and locking can each be set for the circuit.
Can OS Giken tune it for a specific car? Yes. OS Giken retunes Super Lock units in-house. Cone springs set initial torque, pressure ring springs set how quickly full lock arrives, and the pressure ring and iron cross set the ramp angles, so the differential can be matched to car weight, power and track.
How often does it need servicing? On a race car the friction plates wear with use, and the right interval depends on power, track and how hard the car is driven. Inspect the unit with the regular rear end service, and OS Giken can rebuild it with new plates when needed.

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 1.5-Way Super Lock LSD for Winters Quick Change IRS 10in 35-Spline [WN435-HA15]

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OS Giken 1.5-Way Super Lock LSD for Winters Quick Change IRS 10in 35-Spline

Choosing 1.5-Way or 2-Way

Features

Applications

Notes

Frequently Asked Questions

About OS Giken

Reviews