Description
The OS-FR5 and OS-FR7 Sequential Transmissions are specifically designed for use in JDM sport-compact and roadster vehicles.
The “FR” of OS-FR series name designates the front-engine, rear-wheel-drive vehicle specific application for this transmission series. OS-FR series Sequential Transmissions are designed with tear-drop shaped transmission housing and top-mounted gear selector to allow ease of fitment in limited transmission tunnel space often found in compact FR vehicles. A few examples of vehicles suited for the OS-FR series transmission are Mazda MX-5 (NA/NB), Mazda RX7 (FD), or Honda S2000.
OS-FR5
The OS-FR5 is a 5-speed iteration of OS-FR series Sequential Transmission that is designed to handle high torque and power output, while remaining within the spatial constraints of compact FR vehicles. Developed through vigorous testing, the dog-ring and gear design of FR5 allows relatively low shifting efforts for its torque capacity. Manufactured with carefully selected raw-forged materials, the OS-FR5 can handle up to 575 ft/lbs of torque.
OS-FR7
The OS-FR7 is Japan’s very first 7-speed sequential transmission. Contrary to common designs where there is a direct-drive gear within the transmission, the FR7 does not have a direct-drive gear due to a unique drop-gear design. The drop-gear design minimizes shifting effort and allows quick and precise shifting. Along with the ease of shifting, the spread of 7 gears in FR7 allows the vehicle to easily stay in power band regardless of the engine characteristics. Manufactured with carefully selected raw-forged materials, the OS-FR7 can handle up to 430 ft/lbs of torque.
FR5 & FR7 Gear Ratios
| | 1st | 2nd | 3rd | 4th | 5th | 6th | 7th |
| Standard FR-5 | 2.573 | 1.830 | 1.431 | 1.195 | 1.000 | | |
| Standard FR-7 | 2.713 | 1.882 | 1.575 | 1.318 | 1.098 | 0.941 | 0.822 |
- 26 spline input shaft
- Recommended to pair with Tilton 60-1200 hydraulic release bearing or similar
- Customization / modification of drive shaft, shifter lever, shifter linkage, and transmission mounts may be required depending on use
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