Does the R4C Clutch for JZA70 need anything else to fit?

Yes. The R4C Clutch for JZA70 is a push-type clutch and the JZA70 Supra R154 five-speed uses a pull-type release from the factory, so it is installed with the OS Giken Movement Alteration Kit for JZA70 R4C (TY021-DH50M). Turn 14 lists that kit as required, and the two go in together.

How much power will it hold?

OS Giken USA rates the R4C at about 1,400 lb-ft of torque, and OS Giken Japan places the R series in its 700 PS class. That is the top of the OS Giken clutch range, built for competition engines. Our team can help with any questions.

It is the OS Giken model code. R is the cover series, 4 is the number of discs and C is the 215mm disc size. There is no D in the code; the R series uses the OS Giken floating dampened center hub instead, built to withstand transmission shock. Our team can help with any questions.

Is it usable on the street?

It is a race clutch. Engagement is firm and abrupt, and it passes more noise and driveline shock than a street clutch. It can be driven on the road, but most owners fit it to cars used mainly at events or the track.

Can it be rebuilt when it wears?

Yes. OS Giken sells Overhaul Kit A (TY021-DH50A), with new discs, center plates, pressure plate and cover bolts, and Overhaul Kit B (TY021-DH50B), which adds a new cover. Ask our team for either kit when the R4C Clutch for JZA70 needs service.

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Description

OS Giken R4C Clutch for JZA70 Toyota Supra 1JZ-GTE, Quad Plate

OS Giken’s R4C Clutch for JZA70 Supra models is the quad plate clutch from OS Giken’s R series, the highest capacity range OS Giken builds. Four 215mm discs sit in an R series cover with floating center hub construction, and OS Giken USA rates the clutch at up to about 1,400 lb-ft, with the heat capacity that comes with four discs. OS Giken USA says the R4C is found in its own competition drift and drag cars, and it is made for 1JZ-GTE builds at that level.

Built for Competition Use

The R4C Clutch for JZA70 cars is a race clutch first. OS Giken USA describes the R series as made for race cars, and the R4C as the clutch used in OS Giken competition drift and drag vehicles. Engagement is firm and it passes more noise and driveline shock than a street clutch, so it suits cars used mainly at events.

How It Is Listed

OS Giken USA and Turn 14 list the R4C for the JZA70 Supra 1JZ-GTE. OS Giken Japan lists the triple plate R3C for the 1JZ-GTE and does not show the R4C in its Toyota table, so our team will confirm details with OS Giken before the order is placed.

Features

Four 215mm clutch discs
R series cover with floating center hub construction
Rated by OS Giken USA at about 1,400 lb-ft
Push-type design, installed with the Movement Alteration Kit for JZA70 R4C
Rebuildable with OS Giken overhaul kits

Applications

Toyota Supra: JZA70 | 1990-1993 | 2.5L 1JZ-GTE twin turbo, R154 five-speed

Notes

This R4C Clutch for JZA70 installation requires the OS Giken Movement Alteration Kit for JZA70 R4C, sold separately
OS Giken rebuild parts for this clutch are Overhaul Kit A (TY021-DH50A) and Overhaul Kit B (TY021-DH50B)
Installation labor is not included

Frequently Asked Questions

Does the R4C Clutch for JZA70 need anything else to fit? Yes. The R4C Clutch for JZA70 is a push-type clutch and the JZA70 Supra R154 five-speed uses a pull-type release from the factory, so it is installed with the OS Giken Movement Alteration Kit for JZA70 R4C (TY021-DH50M). Turn 14 lists that kit as required, and the two go in together.
How much power will it hold? OS Giken USA rates the R4C at about 1,400 lb-ft of torque, and OS Giken Japan places the R series in its 700 PS class. That is the top of the OS Giken clutch range, built for competition engines. Our team can help with any questions.
What does R4C mean? It is the OS Giken model code. R is the cover series, 4 is the number of discs and C is the 215mm disc size. There is no D in the code; the R series uses the OS Giken floating dampened center hub instead, built to withstand transmission shock. Our team can help with any questions.
Is it usable on the street? It is a race clutch. Engagement is firm and abrupt, and it passes more noise and driveline shock than a street clutch. It can be driven on the road, but most owners fit it to cars used mainly at events or the track.
Can it be rebuilt when it wears? Yes. OS Giken sells Overhaul Kit A (TY021-DH50A), with new discs, center plates, pressure plate and cover bolts, and Overhaul Kit B (TY021-DH50B), which adds a new cover. Ask our team for either kit when the R4C Clutch for JZA70 needs service.

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.

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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 R4C Clutch for JZA70 Toyota Supra 1JZ-GTE, Quad Plate [TY021-DH5]

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OS Giken R4C Clutch for JZA70 Toyota Supra 1JZ-GTE, Quad Plate

Built for Competition Use

How It Is Listed

Features

Applications

Notes

Frequently Asked Questions

About OS Giken

Reviews