Product Overview
The Samsonas Motorsport Sequential Gearkit allows you to convert your Subaru Impreza STI (2002+) transmission into a full sequential dogbox while retaining the original gearbox housing1. Engineered for professional motorsport, this kit offers lightning-fast gear changes without the need for a completely new custom casing.
Key Features & Engineering
Sequential Conversion: Transforms the H-pattern shift mechanism into a pure sequential operation for faster acceleration.
High-Strength Construction: Gears are manufactured from the highest quality forged steel2.
Optimized Design: Features new type straight-cut gears with a special tooth profile to ensure minimum rolling resistance and maximum strength3.
Billet Internals: All selectors, shifting fingers, protections, and fork rods are made from billet steel for maximum reliability under race conditions4.
Sensor Included: The kit includes a high-grade Hall Effect Gear Position Sensor555555555.
Available Configurations (Variants)
You can choose between two main configurations depending on your racing regulations and preference:
5 Speed Sequential: Often preferred for Rally and Drag racing66.
6 Speed Sequential: Ideal for Circuit and Time Attack77.
Technical Ratios (Sample)
The kit offers specialized ratios for different disciplines. Below are examples for the 6-Speed configuration:
| Gear | Rally (6 Spd) | Circuit (6 Spd) | Drag (5 Spd) |
| 1st | 2.818 | 2.818 | 3.333 |
| 2nd | 2.000 | 2.000 | 2.384 |
| 3rd | 1.500 | 1.500 | 1.750 |
| 4th | 1.190 | 1.190 | 1.333 |
| 5th | 0.962 | 1.087 | 1.042 |
| 6th | 0.833 | 1.000 | N/A |
[Data Source: SUBARU STI 5-6 SPEED SEQ EU.pdf, Page 1 - Gearkit Ratios Table]8. |
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Applications
Rally & Rally Cross
Drag Racing
Time Attack
Circuit Racing
Hill Climb
Note: This package includes the gearkit and position sensor. It requires the OEM gearbox case for assembly. Professional assembly is highly recommended
