What ratios does the 5-Speed Close Ratio Gear Kit for S14 SR20DET use?

The 5-Speed Close Ratio Gear Kit for S14 SR20DET uses 2.596 for first, 1.765 for second, 1.250 for third and 0.833 for fifth, against the factory 3.321, 1.902, 1.308 and 0.759. Fourth stays at 1.000. Our team can help with any questions.

What is the difference from the three-speed kit?

The three-speed kit changes first to third only. This kit also changes fifth and adds an OS Giken input shaft, and OS Giken USA lists it with reinforced shafts. The two kits are not interchangeable. Our team can help with any questions.

Which gearbox does it fit?

It fits the FS5W71C five-speed behind the SR20DET in the S14 Silvia. OS Giken Japan modeled the kit on the final-specification S14 turbo gearbox, so our team will confirm your gearbox before the order is placed. Our team can help with any questions.

Are the gears noisy like a race gearbox?

No. OS Giken cuts these gears helically rather than straight-cut, which keeps operation quiet and smooth enough for street driving while staying reliable for racing. The shift feel stays close to the factory gearbox because the kit uses the factory casing.

How is the kit installed?

The gearbox is rebuilt with the OS Giken gears in place of the factory parts, following the factory service manual for the car. OS Giken describes its gear kits as competition parts, so have the work done by a shop experienced with this gearbox.

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Description

OS Giken 5-Speed Close Ratio Gear Kit for S14 SR20DET Nissan Silvia FS5W71C

OS Giken’s 5-Speed Close Ratio Gear Kit for S14 SR20DET gearboxes changes first, second, third and fifth in the FS5W71C five-speed and adds an OS Giken input shaft. The OS Giken ratios are 2.596, 1.765, 1.250 and 0.833 for fifth, against the factory 3.321, 1.902, 1.308 and 0.759, with fourth staying at 1.000. OS Giken USA lists this version with reinforced shafts, and OS Giken Japan built it from the final-specification S14 turbo gearbox. OS Giken USA says its close ratio gear kits are researched and designed for each engine’s intended racing application, with ratios chosen to keep the engine in its peak power band so the car keeps accelerating as efficiently as possible.

The Full Close Ratio Set

The 5-Speed Close Ratio Gear Kit for S14 SR20DET cars tightens the whole spread, including fifth, so the SR20DET stays nearer its peak power from first to top gear. Each gear is made from forged material and then hard shot peened for strength and durability, and the gears are helical-cut rather than straight-cut to keep operation quiet and smooth on the street while staying reliable for racing.

Features

Closer first, second, third and fifth gears for the FS5W71C
Includes an OS Giken input shaft; OS Giken USA lists reinforced shafts
Forged gears, hard shot peened for strength
Helical-cut for quiet, smooth operation
Ratios chosen to keep the engine in its power band

Specifications

1st gear: 2.596 (factory 3.321)
2nd gear: 1.765 (factory 1.902)
3rd gear: 1.250 (factory 1.308)
4th gear: factory 1.000
5th gear: 0.833 (factory 0.759)

Applications

Nissan Silvia: S14 | 1993-1998 | 2.0L SR20DET, FS5W71C five-speed

Notes

OS Giken Japan built this kit from the final-specification S14 turbo gearbox; our team will confirm your gearbox before the order is placed
OS Giken Japan notes that the three-speed and five-speed kits are not interchangeable and cannot be mixed with factory gears
OS Giken describes its gear kits as competition parts
Installation labor is not included

Frequently Asked Questions

What ratios does the 5-Speed Close Ratio Gear Kit for S14 SR20DET use? The 5-Speed Close Ratio Gear Kit for S14 SR20DET uses 2.596 for first, 1.765 for second, 1.250 for third and 0.833 for fifth, against the factory 3.321, 1.902, 1.308 and 0.759. Fourth stays at 1.000. Our team can help with any questions.
What is the difference from the three-speed kit? The three-speed kit changes first to third only. This kit also changes fifth and adds an OS Giken input shaft, and OS Giken USA lists it with reinforced shafts. The two kits are not interchangeable. Our team can help with any questions.
Which gearbox does it fit? It fits the FS5W71C five-speed behind the SR20DET in the S14 Silvia. OS Giken Japan modeled the kit on the final-specification S14 turbo gearbox, so our team will confirm your gearbox before the order is placed. Our team can help with any questions.
Are the gears noisy like a race gearbox? No. OS Giken cuts these gears helically rather than straight-cut, which keeps operation quiet and smooth enough for street driving while staying reliable for racing. The shift feel stays close to the factory gearbox because the kit uses the factory casing.
How is the kit installed? The gearbox is rebuilt with the OS Giken gears in place of the factory parts, following the factory service manual for the car. OS Giken describes its gear kits as competition parts, so have the work done by a shop experienced with this gearbox.

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 5-Speed Close Ratio Gear Kit for S14 SR20DET Nissan Silvia FS5W71C [NS052-GS]

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OS Giken 5-Speed Close Ratio Gear Kit for S14 SR20DET Nissan Silvia FS5W71C

The Full Close Ratio Set

Features

Specifications

Applications

Notes

Frequently Asked Questions

About OS Giken

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