RB25 vs RB26: Difference and Comparison

While RB26 is a much more powerful version- owing to the numerous electrical, mechanical, and technical improvements incorporated into this version. The 2.6 L RB26 engine operates at an enhanced power capacity of 280 PS at 6,800 rpm and a torque of 353 N.m at 4000 rpm.

Key Takeaways

  1. RB25 and RB26 are two engine models produced by Nissan for use in their Skyline GT-R cars.
  2. RB25 is a 2.5-litre, six-cylinder engine with a single turbocharger, producing around 300 horsepower; RB26 is a 2.6-litre, six-cylinder engine with twin turbochargers, producing around 330 horsepower.
  3. RB25 was used in earlier Skyline models, while RB26 was used in later generations, including the iconic R32, R33, and R34 GT-Rs.

RB25 vs RB26

The RB25 engine is a 2.5-liter inline-six-cylinder engine; it has a dual overhead camshaft (DOHC) configuration and is available in both naturally aspirated and turbocharged versions. The RB26 engine is a 2.6-liter inline-six-cylinder engine; it also has a DOHC configuration and is turbocharged.

RB25 vs RB26 2

Comparison Table

Parameters of ComparisonRB25RB26
Power CapacityRB25 engines operate at a power capacity of 182-203 PS at 6000 rpm and a torque of 255 N.m at 4000 rpm.RB26 engines operate at a power capacity of 280 PS at 6,800 rpm and a torque of 353 N.m at 4000 rpm.
Engine Capacity2.5 L engine capacity with a stroke of 71.7 mm.2.6 L engine capacity and a stroke of 73.7 mm.
LiftersHydraulic lifters.Solid lifters.
Throttle BodiesSingle throttle body.Six throttle body.
Turbo PowerNon-turbo (initial version)Twin turbo-powered engine.
CostLower than RB26 engines.Higher than RB25 engines.

What is RB25?

RB25 engines were introduced by Nissan in 1993 as a part of its coveted RB series, specifically for the Nissan Skyline GTST R33. The RB25 engine was an improvement over its RB20DET predecessor.  

This new range featured 2.5 L, 2498cc engines and witnessed several improvements rolled out in the subsequent years.

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Thus, the new model improved the power capacity of its predecessor at a lower rpm.

The update for the RB25 engine was launched in 1995 when Nissan announced the release of series 2 RB25DET engines in this range. The update featured an advanced turbocharger and electric system.

Finally, in 1998 the RB25DET NEO was introduced with further revisions specifically for Nissan Skyline R34.

rb25

What is RB26?

The RB26 engines were in wide circulation from 1998-2002. The RB26DETT line featured 2.6 L inline-six engines.

The RB26 DETT engine is often entitled as the king of engines in the Nissan RB engine range. Implementing T-25 ceramic turbochargers, the engine has a twin-turbo system.

The highest recorded power level post-production was 280 PS at 6,800 rpm and a torque of 353 N.m at 4000 rpm.

Recently Nissan announced its decision to resume production of the RB26 engines.

rb26

Main Differences Between RB25 and RB26

  1. The main difference between RB25 and RB26 is in terms of the power capacity of each engine version. The former has a capacity of 182-203 PS at 6000 rpm and a torque of 255 N.m at 4000 rpm. While the latter operates at a capacity of 280 PS at 6,800 rpm and a torque of 353 N.m at 4000 rpm.
  2. The former version boosts a 2.5L engine capacity with a stroke of 71.7 mm. The latter is empowered by a 2.6 L engine capacity and a stroke of 73.7 mm. This makes the RB26 version more powerful than the RB25 model.
References
  1. https://www.sae.org/gsdownload/?prodCd=860106
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