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Special Parts
Our extensive racing experience matched with our technical manufacturing knowledge, has led to the development of a wide assortment of custom and limited parts to meet the rigorous demands of the ambitious racing world. Throughout the years, these parts have become highly sought after, so we now include them in our product line-up


For Nissan RB26DETT we have designed this sequential transmission to specifically fit the engine characteristics of Nissan’s RB26DETT engine to allow it to perform to its maximum potential. To withstand the incredible punishment a race tuned RB26DETT is capable of delivering to the drivetrain, we engineered and manufactured a reinforced transmission case made from high-quality forged materials. By optimizing gear size and settings, we have increased the gear axis distance to 88mm, resulting in a 6-speed sequential transmission capable of withstanding up to 1500 horsepower. In addition, our unique dog link mechanism enables accurate shift changes, as well as provides a positive shift feel. Each unit is hand made and thoroughly examined to our exacting standards prior to shipment to ensure the highest quality.

The OS88 is comprised of synchro-less helical cut gears and is the perfect complement for a tuned RB26DETT motor. It can be ordered with 4 different sets of gear ratios to suit almost any engine power profile and racing purpose. We also offer an assortment of optional parts to provide the ultimate solution for the serious racer.

Gear ratios:
Standard: 1st 2.609 / 2nd 1.934 / 3rd 1.521 / 4th 1.210 / 5th 1.00 / 6th 0.852
Option ratio 1: 1st 2.609 / 2nd 1.934 / 3rd 1.521 / 4th 1.210 / 5th 1.00 / 6th 0.785
Option ratio 2: 1st 2.890 / 2nd 1.981 / 3rd 1.468 / 4th 1.174 / 5th 1.00 / 6th 0.757
Option ratio 3: 1st 2.516 / 2nd 1.865 / 3rd 1.468 / 4th 1.174 / 5th 1.00 / 6th 0.822




























Optional Parts:
Release Bearing Set
Adjustable Fork Kit
OS88 Exclusive Transmission Crossmember (allows extra 40mm of road clearance)
Center Alignment Tool
Direct Shift Lever Kit
Heavyweight Shift Knob
Included in the RB30 kit:
– 1 cylinder block
– 1 billet crankshaft
– 6 billet-forged connecting rods
– 7 crankshaft main bearings
– 6 connecting rod bearings
– 6 forged aluminum pistons
– 1.3mm metal gasket (1.2mm, 1.4mm and 1.5mm gaskets available)
– 1 timing belt
– 1 belt tensioner kit
– 14 custom made reinforced crank cap stud bolts and nuts
– 3 M6 bolts

RB30 OS-E2996 and RB315 OS-E3138
By utilizing our engineering knowledge and proven manufacturing capabilities, our world-famous OS Giken RB30 engine begins as a brand new Nissan RB26DETT N1 block, which is then stroked and bored to achieve 2996cc of displacement. For competition use only, we also offer a higher performing OS-RB315 engine. With the supporting modifications and proper tuning, this motor is capable of reliably outputting over 1400hp!