D-MAX RACING SPEC 5-Speed Close-Ratio Transmission (SR20DET)
D-MAX RACING SPEC 5-Speed Close-Ratio Transmission (SR20DET)
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A close-ratio transmission set that includes a reinforced main shaft. The main shaft is a reinforced, sub-zero treated type. Close-ratio 1st–5th gears minimize RPM drop on upshifts, making it easier to stay in the power band.
A racing-spec gearbox developed with competition-level circuit driving in mind, after about two and a half years of development and testing. Real-world testing confirmed reduced loss between gear ratios, especially between 2nd and 3rd.
Test courses: Suzuka Twin Circuit / Meihan Sportsland / Bihoku Highland Circuit / Nikko Circuit / Setouchi Kaisan Circuit / Tokushima Kartland / Ebisu Circuit
Gear ratio
| Transmission | 1st | 2nd | 3rd | 4th | 5th |
|---|---|---|---|---|---|
| OEM | 3.321 | 1.902 | 1.308 | 1.000 | 0.759 |
| Racing Spec | 2.600 | 1.742 | 1.285 | 1.000 | 0.844 |
| Cross ratio | 〇 | 〇 | 〇 | - | 〇 |
Material
SAE4320
Fitment
| Transmission | 5M/T |
|---|---|
| Transmission case | S14 early model |
*Recommended for up to approx. 400 PS
*Recommended clutch: single-plate clutch
*Molded from: S14 early Silvia K's Turbo
*Replacement gear parts available
*For gear installation, refer to the Nissan OEM service manual.
