The Nissan RB26DETT is a 2.6L straight-6 four-stroke engine best known for being the power plant for Nissan’s premier sports car the Skyline. The “D” indicates a double overhead cam, the “E” stands for electronically fuel-injected, and the “TT” means the engine has twin turbochargers.
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Originally, the R32 Skyline GT-R was planned to have a 2.4L RB24DET (single turbo) in order to compete in the 4000cc class of Group A. But when Nismo engineers added the AWD system to the R32 Skyline it made the car heavy and less competitive. At that point, Nissan made the decision to add twin turbochargers to the now 2.6L engine and compete in the 4500cc class. The resulting engine would be known as the RB26DETT that is popular today.
The first 2.6L RB26DETT engine featured in the Nissan R32 Skyline produced around 276HP (206 kW) @ 6800 rpm and 260 ft lbs (353 N·m) @ 4400 rpm. The last series of the RB26DETT present in the R34 Skyline produced 280 PS (206 kW) @ 6800 rpm but increased torque to 289 ft·lb (392 N·m) @ 4400 rpm.
Aftermarket performance companies like HKS and Tomei sell parts like variable cams and pulleys for the RB26 that increase its tuning and performance potential. With extreme modification, the RB26 engine is capable of horsepower in excess of 1 megawatt or 1,340 horsepower.
The RB26DETT engine can be found in the following cars:
- Nissan Skyline GT-R R32
- Nissan Skyline GT-R R33
- Nissan Skyline GT-R R34
- Nissan Stagea 260RS
- Tommy Kaira ZZ II