RB25DET
RB25DET 2.5L Turbocharged Inline-6
2498ccInline-6, DOHC, Turbocharged
The RB25DET is the single-turbo 2.5-liter variant of Nissan's legendary RB inline-six family. Used in the R33 and R34 Skyline GTS-T models, it shares the same iron block architecture as the RB26DETT but with a single turbocharger and slightly smaller displacement. The RB25 is a popular swap choice for S-chassis and R-chassis drift builds due to its strong torque, robust bottom end, and excellent aftermarket support.
Nissan Skyline R33 GTS-T (1993–1998)Nissan Skyline R34 GT-T (1998–2002)Nissan Stagea C34 (1996–2001)
Always verify torque specifications with your specific year/model OEM service manual before assembly. Values shown are reference specifications and may vary by model year, revision, or regional market.
1Cylinder Head
11 specifications · 6 locked
| Component | Value | Unit | Notes |
|---|---|---|---|
| 1Cylinder Head Bolts — Step 1 | 21 | lb-ft | Torque in sequence from center outward, cold engine |
| 2Cylinder Head Bolts — Step 2 | 72 | lb-ft | Torque in sequence |
| 3Cylinder Head Bolts — Step 3 (Loosen) | Loosen | ° | Fully loosen all bolts to 0 Nm |
| 4Cylinder Head Bolts — Step 4 | 18–25 | lb-ft | Re-torque in sequence |
| 5Cylinder Head Bolts — Step 5 | 69–76 | lb-ft | Final torque OR +85–95° angle turn |
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2Short Block
9 specifications · 4 locked
| Component | Value | Unit | Notes |
|---|---|---|---|
| Main Bearing Cap Bolts | 34–38 | lb-ft | Torque in 2–3 steps from center outward |
| 1Connecting Rod Bolts — Step 1 | 11–12 | lb-ft | Initial torque |
| 2Connecting Rod Bolts — Step 2 (Angle) | +60–65° | ° | Angle turn; oil bolt threads before assembly |
| Flywheel Bolts (M/T) | 105–112 | lb-ft | Apply thread locker; torque in cross pattern |
| Crank Pulley Bolt | 123–131 | lb-ft | Use flywheel lock tool |
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3Accessories & Turbo
7 specifications · 2 locked
| Component | Value | Unit | Notes |
|---|---|---|---|
| Turbo Inlet Nut | 32–40 | lb-ft | Use anti-seize on exhaust side |
| Turbo Outlet Bolt/Nut | 18–21 | lb-ft | |
| Water Pump Bolts (M6) | 5–6 | lb-ft | |
| Water Pump Bolts (M8) | 12–15 | lb-ft | |
| Belt Tensioner Mounting Nut | 32–43 | lb-ft | |
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