OS Giken OS-88 6-speed sequential Gearbox for Nissan Skyline R32 R33 R34 GTR RB26 - Option 1 Ratio

The best gear ratio that maximizes the engine characteristics!
Outstanding strength and high quality for 1500 horsepower!
The best gear ratio is set to maximize the engine characteristics of the RB26.
In order to ensure outstanding strength and high quality, carefully selected raw materials are forged and manufactured with materials with increased strength.
By setting the optimum tooth width and expanding the distance between the gear shafts to 88mm, we have achieved a significant increase in strength.
Adopting a unique dog ring structure, it realizes a reliable shift change and moderate shift touch.
Each part of the product is carefully assembled, and
only missions that have passed our strict internal standards are shipped.

Applications:

Nissan Skyline R32 GTR 
Nissan Skyline R33 GTR
Nissan Skyline R34 GTR

Attention: BNR32/BCNR33/BNR34 OS-88 R3C or R4C (26 teeth reinforced spline type center hub) is required for OS-88. 
 
　　      　　 R3C/R4C installation for BNR34 requires 6 x NISSAN genuine part flywheel bolt (12315-04U00).
                 If you have OS clutch R3C or R4C for RB26 (26 teeth reinforced spline type), you can use it for OS-88.　
                 If you have OS clutch R3C or R4C for RB26 (Nissan spline type), you need to replace their center hub for OS-88 center hub.
 
(*SE1) Attention: OS-88 clutch requires OS-88 release sleeve assy.            

Q: Is there a Installation guide? 

Yes, please see the installation guide here!

Q: What is the OS Giken OS-88 6-Speed Sequential Gearbox?

A: The OS Giken OS-88 6-Speed Sequential Gearbox is a transmission system specifically designed for the Nissan Skyline R32, R33, and R34 GTR models with the RB26 engine. It offers exceptional strength, high quality, and a carefully selected gear ratio to maximize the engine's performance.

Q: What is the best gear ratio for maximizing engine characteristics?

A: The OS Giken OS-88 gearbox offers three different gear ratio options, each tailored to optimize the RB26 engine's characteristics. These options are:

Option 1: 1st gear - 2.609, 2nd gear - 1.934, 3rd gear - 1.521, 4th gear - 1.210, 5th gear - 1.000, 6th gear - 0.785.
Option 2: 1st gear - 2.890, 2nd gear - 1.981, 3rd gear - 1.468, 4th gear - 1.174, 5th gear - 1.000, 6th gear - 0.757.
Option 3: 1st gear - 2.516, 2nd gear - 1.865, 3rd gear - 1.468, 4th gear - 1.174, 5th gear - 1.000, 6th gear - 0.822.

Q: What makes the OS Giken OS-88 gearbox strong and high quality?

A: The OS Giken OS-88 gearbox is manufactured using carefully selected raw materials that are forged and processed to increase their strength. By setting the optimum tooth width and expanding the distance between the gear shafts to 88mm, the gearbox achieves a significant increase in strength. It is built to handle up to 1500 horsepower, ensuring outstanding durability and reliability.

Q: How does the OS Giken OS-88 gearbox ensure smooth shifting?

A: The OS Giken OS-88 gearbox features a unique dog ring structure that enables reliable and precise gear shifts. This design allows for a moderate shift touch, ensuring a smooth and seamless transition between gears.

Q: How are the OS Giken OS-88 gearboxes manufactured and tested?

A: Each OS Giken OS-88 gearbox is carefully assembled with attention to detail. Only gearboxes that meet the strict internal standards of OS Giken are shipped to customers. This rigorous manufacturing and testing process ensures that each gearbox meets the high-quality standards set by OS Giken.

Q: Do I use the original transfer box? 

A: Yes this is intended to be used with your original transfer box. Some bolts may need to be cut down in, length, see the installation guide for more details.

We have this same setup in the D2 Motorworks R32 GTR, This famous big spec R32 GTR race car In Japan, this car was built by D2 Motorworks (http://www.d2motorworks.com/) about 9 years ago and featuring a 2.8 Step 2 Stroker kit, 6 speed Os Giken OS88 Sequential gearbox and more. having won several race series including HKS Hiper round 2 at Okayama international circuit.

Founder Masaharu Okazaki founded the Okazaki Speed ​​Technology Research Institute. In the early 1970s, while tuning motorcycles and automobiles on the market, his lifework, high rpm, high output, gathered the best of his own theory and technology. Succeeded in developing the original engine TC16-MA1. However, because of its high output, the off-the-shelf clutch, transmission, and differential gear that transmits power to the final drive wheels make noise. In order to transmit the maximum output of the engine to the end, his extraordinary passion that "if it breaks, make something that won't break" and the belief that "you won't know until you try" continue to today's OS Giken. It has been inherited and transformed into products.