Does the Super Lock LSD for ZN6 fit the GR86?

OS Giken lists the Super Lock LSD for ZN6 and ZC6 cars, part number TY421-HA, for the first-generation FA20 models: the Scion FR-S, Toyota 86 and Subaru BRZ. The 2022-on GR86 and second-generation BRZ use the larger FA24 engine and are not listed, so confirm with Bulletproof Automotive before ordering for a newer car.

Why replace the factory Torsen?

The factory Torsen biases torque only while both rear tires carry load. In a tight corner the light FA20 coupe lifts weight off the inside rear, the Torsen stops biasing and torque is lost to wheelspin. A clutch-type LSD keeps transmitting torque through its friction plates, which is why autocross and drift drivers make the change.

Is it good for drifting?

Yes. A clutch-type differential locks both rear wheels under power, which makes slides easier to start and hold than with the factory torque-sensing unit. OS Giken also offers retuning of initial torque and lock timing if a driver wants a more aggressive setting for drift use.

Is it quiet enough for daily use?

Yes. OS Giken builds the Super Lock with a low preload that still reaches full lock progressively, and its Japanese catalogue describes it as one of the quietest LSDs in city driving. Clutch-type units can make some noise in tight parking turns, which is normal and usually mild with the correct oil.

What oil should be used?

Use a gear oil intended for clutch-type limited-slip differentials, because the friction plates depend on it for smooth engagement. OS Giken makes its own gear oils, and Bulletproof Automotive can advise on a suitable fluid when the differential is installed.

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Description

OS Giken Super Lock LSD for ZN6 Toyota 86 / Scion FR-S and ZC6 Subaru BRZ

OS Giken’s Super Lock LSD for ZN6 Toyota 86 / Scion FR-S and ZC6 Subaru BRZ swaps the factory Torsen for a clutch-type differential, the change that turns the FA20 coupe from a car that pushes a light inside wheel into one that drives hard off the apex. The factory unit biases torque well while both rear tires are loaded, but the 86 is driven on the limit of grip, and once the inside wheel unloads in a tight corner it lets torque escape. The Super Lock keeps both tires working through the OS Giken pressure ring. It is the upgrade for a car used at autocross, drift practice or club track days; a stock commuter does not need it.

Design and Performance

OS Giken threads the friction plates onto splines running through the side gears, so the case holds up to twice the plates of competing designs. That plate area means a gentle preload for street use and smooth progression to full lock on throttle. The case is machined from one billet, gears are raw-forged, and all parts are chemically heat treated.

Features

Clutch-type replacement for the factory Torsen unit
Patented OS Giken pressure ring for progressive lock
Up to twice the friction plates of rival designs
Street-friendly preload for a dual-purpose car
Billet case and raw-forged, heat-treated gears
Retunable for initial torque, lock timing and ramp angle

Applications

Scion FR-S: ZN6 | 2013-2016 | 2.0L FA20 flat-four
Subaru BRZ: ZC6 | 2013-2020 | 2.0L FA20 flat-four
Toyota 86: ZN6 | 2017-2020 | 2.0L FA20 flat-four

Notes

The Super Lock LSD for ZN6 and ZC6 cars is supplied as a complete differential unit; installation labor is not included
OS Giken lists this part for the first-generation FA20 cars; the 2022-on GR86 and BRZ are not listed
Plate-type differentials respond to oil choice; use a gear oil suited to clutch-type LSDs

Frequently Asked Questions

Does the Super Lock LSD for ZN6 fit the GR86? OS Giken lists the Super Lock LSD for ZN6 and ZC6 cars, part number TY421-HA, for the first-generation FA20 models: the Scion FR-S, Toyota 86 and Subaru BRZ. The 2022-on GR86 and second-generation BRZ use the larger FA24 engine and are not listed, so confirm with Bulletproof Automotive before ordering for a newer car.
Why replace the factory Torsen? The factory Torsen biases torque only while both rear tires carry load. In a tight corner the light FA20 coupe lifts weight off the inside rear, the Torsen stops biasing and torque is lost to wheelspin. A clutch-type LSD keeps transmitting torque through its friction plates, which is why autocross and drift drivers make the change.
Is it good for drifting? Yes. A clutch-type differential locks both rear wheels under power, which makes slides easier to start and hold than with the factory torque-sensing unit. OS Giken also offers retuning of initial torque and lock timing if a driver wants a more aggressive setting for drift use.
Is it quiet enough for daily use? Yes. OS Giken builds the Super Lock with a low preload that still reaches full lock progressively, and its Japanese catalogue describes it as one of the quietest LSDs in city driving. Clutch-type units can make some noise in tight parking turns, which is normal and usually mild with the correct oil.
What oil should be used? Use a gear oil intended for clutch-type limited-slip differentials, because the friction plates depend on it for smooth engagement. OS Giken makes its own gear oils, and Bulletproof Automotive can advise on a suitable fluid when the differential is installed.

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 ZN6 Toyota 86 / Scion FR-S and ZC6 Subaru BRZ [TY421-HA]

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OS Giken Super Lock LSD for ZN6 Toyota 86 / Scion FR-S and ZC6 Subaru BRZ

Design and Performance

Features

Applications

Notes

Frequently Asked Questions

About OS Giken

Reviews