The Nissan RB26DETT is a 2,568 cc, inline‑six twin-turbocharged petrol engine produced between 1989 and 2002. It features a cast iron block, aluminium heads, dual overhead camshafts (DOHC), and 24 valves, forming the legendary heart of the Skyline GT-R. Output was factory-rated at 206 kW (280 PS) due to the "Gentlemen's Agreement," though actual output and tuning potential are significantly higher, with torque figures around 353 Nm.
Fitted exclusively to the R32, R33, and R34 generations of the Skyline GT-R, the RB26DETT was engineered for motorsport-derived performance, durability, and precise throttle response. Emissions compliance for its era was managed through sequential multi-port fuel injection and catalytic converters, meeting Japanese pre-2000 emissions standards.
One documented service concern is premature failure of the ceramic turbine wheels in the original turbochargers, particularly under sustained high boost or aggressive tuning. This issue, referenced in Nissan Technical Service Bulletins for the R34 platform, led to the adoption of more durable steel turbine wheels in later production and aftermarket units.
Production years 1989–2002 meet Japanese pre-2000 emissions standards (MLIT Japan Type Approval data for relevant chassis codes).
The Nissan RB26DETT is a 2,568 cc inline‑six twin-turbocharged petrol engineered for the Skyline GT-R (1989-2002). It combines a robust cast iron block with a DOHC 24-valve head to deliver exceptional power potential and legendary durability. Designed for Japanese pre-2000 emissions compliance, it prioritises mechanical strength and tunability over ultimate refinement.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,568 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑6, DOHC, 24-valve | |
| Aspiration | Twin-Turbocharged | |
| Bore × stroke | 86.0 mm × 73.7 mm | |
| Power output | 206 kW (280 PS) [Gentlemen's Agreement] | |
| Torque | 353 Nm @ 4,400 rpm | |
| Fuel system | Sequential multi-port fuel injection (MPI) | |
| Emissions standard | Japanese Pre-2000 Standards | |
| Compression ratio | 8.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Twin T25-type (ceramic turbine, later steel) | |
| Timing system | Chain-driven DOHC | |
| Oil type | API SJ/SL or equivalent (SAE 10W-40) | |
| Dry weight | Approx. 260 kg |
The twin-turbo setup provides a broad, flat torque curve ideal for high-performance driving but demands meticulous maintenance. The original ceramic turbo wheels are fragile; upgrading to steel turbines is highly recommended for any tuned application. Regular oil changes with high-quality 10W-40 oil are critical for turbo and bearing longevity. The low compression ratio allows for significant boost increases on stock internals, making it a tuner's favorite. Always allow turbos to cool down after hard driving.
Oil Specs: Requires high-quality API SJ/SL specification oil for turbo protection (Nissan Owner's Manual R34). SAE 10W-40 is the typical recommendation for performance use.
Emissions: Meets Japanese domestic market pre-2000 emissions standards (MLIT Japan Type Approval). Not certified for Euro or US markets without modification.
Power Ratings: Factory-rated at 280 PS due to industry 'Gentlemen's Agreement'; actual dyno figures often exceed 320 PS (Nissan Group PT-2001, independent dyno data).
Nissan Technical Information System (TIS): Service Manuals SM-EC-89R32, SM-EC-95R33, SM-EC-99R34
Nissan Technical Bulletins: TB-95-008, TB-99-022
Japan Ministry of Land, Infrastructure, Transport and Tourism (MLIT) Type Approval Database
Nissan Group Performance Technical Reports (PT-2001)
The Nissan RB26DETT was used exclusively in Nissan's R32/R33/R34 Skyline GT-R platforms with longitudinal mounting. This engine received generational adaptations-revised turbochargers and intake manifolds in the R33 and R34-with minor running changes throughout its production life. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on a flat pad on the front of the cylinder block, near the timing cover (Nissan SM-EC-89R32). The RB26DETT is visually unmistakable by its inline-six configuration, twin cam covers, and the pair of turbochargers mounted on the exhaust manifolds on the right side. Critical differentiation from the RB25DET: RB26DETT has a 2.6L displacement (86mm bore) and twin turbos, while the RB25DET is a 2.5L single-turbo engine.
The RB26DETT's primary reliability risk is failure of the original ceramic turbocharger wheels, particularly in modified or poorly maintained engines. Nissan service data and tuner reports indicate this is a leading cause of major engine damage for tuned examples, while its robust bottom end ensures long service life with proper care. Oil system wear and ignition coil failure are secondary concerns.
Analysis derived from Nissan technical bulletins (1995-2002) and general workshop/tuner failure statistics. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about NISSAN RB26DETT.
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EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
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