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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.
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 580NM
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
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