What cars used the RB26DETT?

The RB26DETT was exclusively fitted to the Nissan Skyline GT-R in R32 (BNR32), R33 (BCNR33), and R34 (BNR34) forms. No other production vehicle received this engine.

What is the RB26DETT's actual power output?

Nissan officially rated the engine at 280 PS, consistent with the informal JDM ceiling at the time. Multiple independent dyno tests of factory-spec R34 engines showed 330–335 hp at the crank, suggesting the factory detuned the published figure.

How much power can the RB26DETT make reliably?

On the stock iron block with supporting modifications, 500–550 whp is widely achieved. Above that, forged internals (rods and pistons) are recommended. Single-turbo builds regularly reach 600–800 whp on built engines.

What is the difference between R32, R33, and R34 RB26DETTs?

The R34 version received revised inlet manifold geometry and slightly higher-flowing turbocharger housings compared to the R32 and R33 units. The N1 variant (used in motorsport) included a dry-sump option and stronger block casting. At stock tune, the differences in road-use power delivery are modest; all three share the same bottom end architecture.

Nissan · Inline-6 · Twin-turbocharged (Garrett T25/T28 ceramic ball-bearing)

RB26DETT

The RB26DETT is a 2.6-litre DOHC twin-turbocharged inline-six produced by Nissan from 1989 specifically for the Skyline GT-R. It was engineered to meet Group A homologation requirements and was never offered in any other production car. The engine uses two ceramic Garrett ball-bearing turbos (T28 housings on a twin-scroll manifold), a dry-sump oil system option on racing variants, and individual throttle bodies on the intake manifold. Like its contemporaries, it was officially rated at the 280 PS JDM ceiling, though dyno measurements of factory engines consistently read above 300 hp at the crank.

Engine specifications

Displacement	2.6L (2,568cc)
Configuration	Inline-6
Aspiration	Twin-turbocharged (Garrett T25/T28 ceramic ball-bearing)
Valvetrain	DOHC 24-valve
Fuel system	Multi-point fuel injection (individual throttle bodies)
Power (JDM)	280 PS (206 kW) @ 6,800 rpm (official, self-imposed ceiling)
Torque (JDM)	353 N·m (260 lb-ft) @ 4,400 rpm
Redline	8,000 rpm
Notes	Production engines measured at 330 hp+ crank on multiple independent dynamometers at factory tune.

Variants

RB26DETT (R32 BNR32, 1989–1994): Original spec; cast iron block, twin T25 turbos, 280 PS JDM.
RB26DETT N1 (R33 ECR33): Motorsport-homologated N1 variant with stronger block casting, dry-sump lubrication.
RB26DETT (R34 BNR34, 1999–2002): Revised inlet tract, higher-flowing turbos, same 280 PS ceiling with improved mid-range torque.

Vehicles using the RB26DETT

Nissan Skyline GT-R R32 (BNR32)
Nissan Skyline GT-R R33 (BCNR33)
Nissan Skyline GT-R R34 (BNR34)

Common issues

Fuel cut at high boost (stock ECU)

Cause: OEM ECU fuel cut triggers above 0.9 bar; limits safe tuning range on stock management.

Remedy: Fuel cut defender or ECU replace/tune (PowerFC, Nistune).

Turbo ceramic impeller failure

Cause: Stock ceramic turbine wheels are brittle; foreign object ingestion or surge causes fracture.

Remedy: Replace with forged turbine variants or upgrade to larger aftermarket turbos.

Oil surge in hard cornering (track use)

Cause: OEM wet sump design prone to oil starvation in high-g corners.

Remedy: Oil accumulator (RB Motorsport or similar) or dry-sump conversion for sustained track use.

Intake manifold cracking

Cause: Cast intake manifold fatigues from heat cycling over time.

Remedy: Replacement with aftermarket billet or cast aluminum unit.

Tuning ceiling

~500–550 whp on stock bottom end with single-turbo conversion and appropriate supporting modifications. The iron block and forged crank are well-regarded for durability at moderate power levels.

Stage 1 (boost + fuel) 380–430 whp

Boost controller, Z32 MAF, fuel cut defender, 740cc injectors, ECU tune (Nistune or Power FC).

Stage 2 (larger turbos) 480–540 whp

Trust or HKS twin-turbo upgrade, top-feed fuel rail, 1,000cc injectors, Sard or Walbro high-flow pump.

Stage 3 (single-turbo) 600–800 whp

Precision 6766 or equivalent, custom manifold, forged pistons and rods (Tomei or Brian Crower), standalone ECU.

Common modifications

NISMO or HKS fuel rail and injector upgrade
Z32 300ZX MAF adapter (removes fuel cut at high boost)
Trust or HKS twin-turbo upgrade kit
PowerFC or Nistune ECU management
Tomei or GReddy exhaust manifold
Single-turbo conversion (widely documented)
Billet oil cap and extended oil drain to prevent surge

Frequently asked questions

What cars used the RB26DETT?: The RB26DETT was exclusively fitted to the Nissan Skyline GT-R in R32 (BNR32), R33 (BCNR33), and R34 (BNR34) forms. No other production vehicle received this engine.
What is the RB26DETT's actual power output?: Nissan officially rated the engine at 280 PS, consistent with the informal JDM ceiling at the time. Multiple independent dyno tests of factory-spec R34 engines showed 330–335 hp at the crank, suggesting the factory detuned the published figure.
How much power can the RB26DETT make reliably?: On the stock iron block with supporting modifications, 500–550 whp is widely achieved. Above that, forged internals (rods and pistons) are recommended. Single-turbo builds regularly reach 600–800 whp on built engines.
What is the difference between R32, R33, and R34 RB26DETTs?: The R34 version received revised inlet manifold geometry and slightly higher-flowing turbocharger housings compared to the R32 and R33 units. The N1 variant (used in motorsport) included a dry-sump option and stronger block casting. At stock tune, the differences in road-use power delivery are modest; all three share the same bottom end architecture.

Sources

Nissan RB26DETT Engine Technical Service Manual (BNR32, 1989)
JAMA Group A homologation data, BNR32 (1988)
Nissan Skyline GT-R R34 press materials (1999)

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