When you're talking about Japanese legends, the RB26 and the 2JZ always seem to pop up in the conversation. Ever since Fast & Furious came out in 2001, the Skyline GTR and MK4 Supra have become internet sensations, and so have their motors. There are countless videos on the internet of both engines making well over 1,000 horsepower.
But the question always seems to come up; which one is king of Japan? Well, lets dive in and compare RB26 vs 2JZ, and find out who's really king.
The RB series of engines is a family on inline-6's, ranging from 2.0L to 3.0L. All of which came in different engines dressings, some naturally aspirated, some single turbocharged, some twin turbocharged. However, were talking about the RB26DETT which was the top of the line engine, equipped in the Skyline GTR.
The RB26 came with an 86mm bore, and a 73.7mm stroke, and advanced features such as ITB (Individual Throttle Bodies). It came with parallel T28 ceramic turbochargers limited to 14 PSI of boost.
Much like RB series, the JZ series of engines was a family of inline-6's. Ranging for 2.5L to 3.0L, some naturally aspirated, some twin turbocharged. However, we are going to be talking about the 2JZ-GTE which is the top of line JZ engine that came in twin-turbo model MK4 Supra's.
Just like the RB26, the 2JZ has an 86mm bore, but steps up the stroke from 73.7mm to 86mm. This is where the extra .4L of displacement comes from. Unlike the RB26, the 2JZ came with sequential turbo's, meaning it has a much broader power band.
Stock vs Stock
Okay, so know that you have a little bit of knowledge on each of these engines, lets take a look at some dyne graphs, and compare them stock vs. stock.
Alright, so you've seen the numbers. The make pretty much the same amount of power, however the 2JZ makes about 30 lb-ft of torque more. This isn't to surprising considering it has an extra .4L of displacement, all of which is extra stroke. But, numbers only tell part of the story.
RB26: The RB26 has a very linear power curve, it just slowly gains throughout the power band. It never really peaks or jumps around. This is great because its easy to predict how much power you will get when you pick up the throttle at any given RPM.
2JZ: The 2JZ makes its peak power 1,000 RPM sooner than the RB26, and also makes more torque at an earlier RPM. This is mostly due to its sequential turbos, and extra stroke. The power comes on very early, and flattens out, its not until peak RPM's that it starts to lose power.
Its not really a secret that the 2JZ can hold up to crazy amounts of power on stock internals. Unfortunately, Nissan didn't build the RB26 as strongly as Toyota built the 2JZ.
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RB26: The RB26 stock internals can hold up to about 550-650 horsepower. The stock block can hold up to 1,000+ horsepower. Doing some simple math that will tell you that the RB26 can hold up to 211-250 hp/liter. This is quite an amazing feat for a stock engine.
2JZ: The 2JZ stock internals can hold up 800 horsepower. The stock block can also hold 1,000+ horsepower. Once again doing some math, the 2JZ can hold up to around 266 hp/liter.
So, both of these engines can hold incredible amounts of power, however the 2JZ can hold up to quite a bit more on completely stock engine internals.
If you're building a car, and something on the engine breaks, you're going to need the new part. I think this is what really makes the 2JZ better than the RB26.
RB26: The RB26 never came in any car in the USA, what does this mean? It means that finding parts for it isn't a simple as going to an auto parts store.
Further more, just finding the engine by itself is a hassle, most of the times you'll have to import it from Japan.
2JZ: The 2JZ on the other hand, came in a host of different cars in the USA. This means that finding parts is as easy as going to an auto parts store or a junkyard.
Which One is Better?
So, to answer the question "RB26 vs 2JZ?". Well, I think thats its pretty clear which is the better engine. The 2JZ can hold up to more power, make more power, source parts very easily, and is cheaper to buy and build.
Also read: 1JZ vs 2JZ: Which One is Better?
Now, that said the RB26 is an absolutely amazing engine, but its just not economically feasible to build an RB26 just to hold similar power levels as the 2JZ.
The 2JZ came in a host of cars sold in the US and can be found pretty easily, and if something breaks a store like Autozone is likely to have the part.
The RB26 on the other hand, never came in any car in the US, meaning that it has to be imported, and so do any parts that you might need for it.
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