What makes a TCD different from a Super Lock LSD?

TCD uses the Super Lock mechanism, but the friction discs carry oil holes and channels that keep them wet. That lets the unit switch between open and locked smoothly and quietly, so it suits a road car while still giving the traction of a plate-type LSD.

Are the factory side bearings reused?

OS Giken Japan states that the ring-gear-side bearing on these PDK units is hard to remove, so it is replaced with an OS Giken side bearing. OS Giken USA titles the part as reusing the OEM bearings, so our team will confirm with OS Giken what is supplied.

Does it fit a 991 911 with PDK?

Turn 14 lists the 2016 and 2017 991 Carrera for this part, but OS Giken Japan does not name the 911. Contact our team before ordering for a 911 so we can check with OS Giken which unit, if any, fits the car.

Can the cam angle be changed?

Yes. OS Giken can set the cam angle of a TCD unit, which changes how strongly it locks under power and on deceleration. Tell our team how the car is used and we can pass the request to OS Giken when ordering.

What oil should be used?

Use a gear oil suited to clutch-type limited-slip differentials, and change it more often than with an open differential, especially after track use. Fresh oil keeps the friction plates working consistently, reduces chatter during slow turns and helps the unit last longer between rebuilds.

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Description

OS Giken TCD LSD for PDK Boxster and Cayman 987, 981 and 718

OS Giken’s TCD LSD for PDK Boxster and Cayman models is the Type-I unit OS Giken Japan lists for the seven-speed PDK in the mid-engine Porsches without a factory limited-slip differential: the 987 Boxster and Cayman S, the 981 Boxster and Cayman, and the 718 Boxster and Cayman. TCD is OS Giken’s comfort-oriented mechanical LSD built on the Super Lock mechanism, with oil holes and channels in the friction discs that keep them wet so the unit locks smoothly and quietly. With PDK shifts arriving in milliseconds, it keeps both rear tires driving out of corners instead of letting the inside wheel spin.

Side Bearings on PDK Cars

OS Giken Japan states that the ring-gear-side bearing on these PDK units is hard to remove, so it is replaced with an OS Giken side bearing. OS Giken USA titles this part as reusing the OEM side bearings and lists an 85.7 mm bearing-to-bearing measurement; this listing follows OS Giken Japan.

Features

TCD discs with oil holes and channels for smooth, quiet lock
Built on the OS Giken Super Lock pressure ring mechanism
Plate-type traction with mild engagement for street use
Cam angle can be set by OS Giken to suit the car
Type-I unit for seven-speed PDK cars without a factory LSD

Applications

Porsche Boxster and Cayman S (987): Seven-speed PDK
Porsche Boxster and Cayman (981): Seven-speed PDK, no factory LSD
Porsche 718 Boxster and Cayman: Seven-speed PDK, no factory LSD

Notes

This TCD LSD for PDK Boxster and Cayman models is for cars without a factory LSD; cars with one take the factory-LSD PDK unit
The ring-gear-side bearing is replaced with an OS Giken side bearing, per OS Giken Japan
Turn 14 lists 2016-2017 991 911 fitment, which OS Giken Japan does not; contact our team before ordering for a 911
OS Giken Japan lists Tiptronic cars, PTV Plus cars and cars with a factory LSD (other than PDK) as not compatible
Installation labor is not included

Frequently Asked Questions

Which cars does the TCD LSD for PDK Boxster fit? OS Giken Japan lists the TCD LSD for PDK Boxster and Cayman models for the seven-speed PDK in the 987 Boxster and Cayman S, the 981 Boxster and Cayman, and the 718 Boxster and Cayman, on cars without a factory LSD. Confirm your options before ordering.
What makes a TCD different from a Super Lock LSD? TCD uses the Super Lock mechanism, but the friction discs carry oil holes and channels that keep them wet. That lets the unit switch between open and locked smoothly and quietly, so it suits a road car while still giving the traction of a plate-type LSD.
Are the factory side bearings reused? OS Giken Japan states that the ring-gear-side bearing on these PDK units is hard to remove, so it is replaced with an OS Giken side bearing. OS Giken USA titles the part as reusing the OEM bearings, so our team will confirm with OS Giken what is supplied.
Does it fit a 991 911 with PDK? Turn 14 lists the 2016 and 2017 991 Carrera for this part, but OS Giken Japan does not name the 911. Contact our team before ordering for a 911 so we can check with OS Giken which unit, if any, fits the car.
Can the cam angle be changed? Yes. OS Giken can set the cam angle of a TCD unit, which changes how strongly it locks under power and on deceleration. Tell our team how the car is used and we can pass the request to OS Giken when ordering.
What oil should be used? Use a gear oil suited to clutch-type limited-slip differentials, and change it more often than with an open differential, especially after track use. Fresh oil keeps the friction plates working consistently, reduces chatter during slow turns and helps the unit last longer between rebuilds.

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 TCD LSD for PDK Boxster and Cayman 987, 981 and 718 [PR152-HC]

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OS Giken TCD LSD for PDK Boxster and Cayman 987, 981 and 718

Side Bearings on PDK Cars

Features

Applications

Notes

Frequently Asked Questions

About OS Giken

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