1JZ vs 2JZ: Which One is Better and Why?

Alright, so I’m sure you’ve seen the videos on YouTube of 1,000+ horsepower Toyota Supra’s. Maybe you’re planning on swapping to a JZ engine but don’t know which one to pick, maybe you just want to learn more about the JZ engine family.

Additional JZ family info on Wikipedia

Regardless of why you’re reading this, we’re going to dive into this topic in detail, and compare 1JZ vs 2JZ.

1JZ

As you may have guessed, the 1JZ came before the 2JZ, and it came in a few different forms. Regardless of the engine dressings, it was always a 2.5L inline-6, with a 86mm bore and a 71.5mm stroke. Were going to be talking about the 1JZ-GTE, which is the top of line twin turbo model of the 1JZ.

1JZ swapped AE86 drift car

1JZ AE86

The 1JZ came with parallel turbo’s, and later 1JZ’s came with VVT-i (Variable Valve Timing with Intelligence). The 1JZ came in a variety of vehicles: Toyota Chaser, Toyota Soarer, Toyota Supra MK III (Japan only), Toyota Verossa, and Toyota Crown.

The biggest difference between the 7MGTE and the 1JZ that replaced it is the strength. The 7MGTE was a great engine, but suffered from head bolt, head gasket, and various other issues with the cylinder head. The 1JZ is pretty similar to the 7MGTE, but with a cylinder head that actually stays on the engine.

2JZ

The 2JZ shares most of the components from the 1JZ, the biggest difference in in the displacement. The 2JZ retains the 86mm bore that the 1JZ has, but its stroke is increased from 71.5mm to 86mm. This makes the 2JZ a “square” engine, which means the bore and stoke are equal. This provides a better equal medium between low end torque and high end horsepower.

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2JZ

Unlike the 1JZ, the 2JZ-GTE came with a sequential turbo setup, meaning that the power band is much broader. A small turbo gives low rpm power and helps spin up the bigger turbo for high rpm power.

1JZ vs 2JZ: Stock vs. Stock

So now that you have a little bit of knowledge about these two engines, lets compare them stock vs. stock. Keep in mind, its nearly impossible to find completely stock, non tuned dyno graphs for either of these engines.

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After hours of searching through forums, I found the most stock dyno graphs possible. Both uses 91 octane, stock everything, and non-tuned.

1JZ vs 2JZ

So you’ve seen the numbers, the 2JZ makes about 30 horsepower and 20 lb-ft more than the 1JZ. This shouldn’t be to much of a surprise to you, considering the 2JZ has an extra .5 liters of displacement. Numbers only show so much, the important thing is how it’s making those numbers.

Notice how the 1JZ dyno graph shows the horsepower continually going up. Its a very linear gain throughout the power band. This is great for track use. The power is predictable when getting on and off of the throttle.

The 2JZ dyno graph the horsepower basically just goes up rapidly and then flattens out, but its not very linear. The power goes up early in the RPMs, flattens out, and then goes down in the high RPMs. This is great for street use, because power is available low in the RPMs, where the engine is most of the time.

1JZ vs 2JZ: Modified vs. Modified

I can’t give you dyno graphs comparing 1JZ and 2JZ when modified, because its impossible to find dyno graphs of each engine modified exactly the same. I can tell you that they respond to modifications nearly identically, the 2JZ of course will make a little bit more power and torque thanks to its extra displacement.

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How to engine responds greatly depends on the size of the turbo, but generally speaking a 2JZ making 500whp is going to respond better the throttle inputs than a 1JZ making similar power. This is once again a great attribute of the increased stroke of the 2JZ.

Parts are nearly identical in price as well, however when including the price of purchasing the engine itself, it’s cheaper to build a 1JZ. The most commons upgrades would be a single turbo setup. The factory turbos have issues when the boost is turned up at all.

1JZ vs 2JZ: Engine Strength

Contrary to what most people believe and spread around the internet, the 1JZ and the 2JZ are pretty much equally as strong. Their connecting rods are identical other than the length since the 2JZ has a longer stroke. The crank and pistons are pretty much equally as strong as well.

Also read: RB26 vs 2JZ: Which One is Better and Why?

The reason most people think that the 2JZ is stronger is because it can hold up to higher power levels. But, they fail to account for the extra displacement. A general rule of them is that the 1JZ stock bottom end is good for about 650-700 horsepower, and the stock 2JZ bottom end is good for about 800 horsepower. You would think that the 2JZ would be stronger then right? Wrong

Quad Turbo 2JZ

The stock 1JZ bottom end is good for 650-700, which is 260 – 280 hp/liter (650hp/2.5liter=260hp/liter). The stock 2JZ bottom end in good for around 800, which is 266hp/liter.

Both of these engine’s bottom ends have been pushed way past the numbers I’ve just quoted. But, the 1JZ and 2JZ can reliably push 266hp/liter on their bottom end. When I say reliably, I mean beating the crap out of the engine, for long periods of time, and it not failing.

Both are some of the strongest factory engines to ever come in a production automobile. Very few engines in the world can hold up to 1,000 horsepower or more.

1JZ vs 2JZ: Cool Factor

I feel obligated to bring up the “cool” factor, because I did the same in our RB26 vs 2JZ debate. Being cool and unique is something that can be underrated in the automotive world. In the example of RB26 vs 2JZ, the RB was cooler due to its rarity and arguably better exhaust sound. But, what about the 1JZ and the 2JZ?

Rarity is arguably the biggest part of the cool factor. For example, I love the Chevy LS for its performance, but it’s not that unique or cool anymore. In regards to rarity, the 1JZ is more rare here in the US. This is because we never actually got it in any of our cars.

Sound is also something fairly important to how cool these engines are. After all if it sounds like crap (cough Hondas cough), then it’s not all that cool. In the case of the 1JZ and the 2JZ, they sound extremely similar. This is probably due to them being mostly the same. However, the 1JZs slightly higher redline seems to give it a bit more of a high pitched scream. Both engines sound awesome but I have to give this one to the 1JZ.

What Do the Experts Have to Say?

Well quite frankly, we are not extremely knowledgable experts on the 1JZ vs 2JZ debate. So we went to the experts at Titan Motorsports and asked them which one is better, 1JZ or 2JZ? Heres what they had to say:

“We really don’t deal with the 1JZ, and there isn’t much of a debate that the 2JZ is superior in nearly every way from our standpoint.

A. We don’t take stock vs. stock into account because no one is going to leave our shop with a stock engine.

B. There’s no replacement for displacement.

C. I’ve yet to see an application where the 1JZ was superior in any way, which is 99% of the reason we never have them in our shop, although we do offer parts for those who have these engines. (Mainly early lexus and MKIII supra owners who did JDM swaps because of the ease of installation and expense over doing a similar swap with a 2JZ).

Given the choice between a 1JZ and a 2JZ with dollars not being a factor, I’ve never heard of anyone choosing the 1JZ over a 2JZ

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Keep in mind, Titan Motorsports holds the world record for the fastest “import”, which is a Supra with a 2JZ.

What do Drifter have to Say?

Most high level drifters run either a V8 engine, or a JZ engine. So, I went to my friend Sean Ohlinger, who is a local drifter in Phoenix. He is also apart of a small, local car club called Within Minimum Spec. I asked him “Which do you prefer, 1JZ or 2JZ?” Heres what he had to say:

“I personally prefer the 1JZ over the 2JZ, the 1JZ is way better for drifting on a budget. But, the 2JZ is way better if you’re willing to pay for it. The problem is, 1JZs are a little harder to find since we never got them in the states. There’s is really no logical reason that the 1JZ is better, other than price. Thats why so many people swap them into their car, because they’re so much cheaper.”

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Sean’s 1JZ Swapped AE86 Drift Car

Which One is Better?

The 1JZ is better for slightly drifting, and especially when on a budget. The shorter stroke means it loves to hang out at high RPM’s, but lacks low end power due to a short stoke, and smaller displacement. It takes a fairly long time to spool up the turbo(s) because of its short stroke.

The 2JZ is better for street use. The larger displacement, and longer stroke really help out in the low RPMs. But the longer stroke limits its reliability when at high RPMs for extended periods of time. But, the longer stroke means it can spool up the turbo(s) much faster, making it way better for street use.

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So, to answer the question 1JZ vs 2JZ which one is better? Since most of us build street cars, I would say the 2JZ is the better engine. But, if you’re on a tight budget than you’ll have to settle with the 1JZ.

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RB26 vs 2JZ: Which One is Better and Why?

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.

Nissan RB26

The RB series is a family of inline-6 engines, 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.

RB26vs2JZ1

Additional RB information on Wikipedia

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.

All of this produced an impressive 280 bhp and 293 lb-ft. Although many Nissan enthusiasts claim that the RB26 made closer to 327 bhp. Many stock dyno runs have proved this to be true. Nissan underrated the RB26 to meet Japan’s “gentleman agreement”.

Toyota 2JZ

Much like RB series, the JZ series is a family of inline-6 engines. 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 2JZ engine that came in twin-turbo model MK4 Supra.

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RB26vs2JZ2

Additional JZ information on Wikipedia

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 a sequential turbo setup, meaning it has a much broader power band.

All of this produced an advertised 280 horsepower and 320 lb-ft of torque. Just like the RB26, it had to conform to the “gentleman agreement”. Stock dyno testing shows that the 2JZ-GTE actually makes closer to 320 horsepower.

RB26 vs 2JZ: Stock vs Stock

Okay, so now that you have a little bit of knowledge on each of these engines, lets take a look at some dyno graphs and compare them stock vs. stock.

RB26

  • Horsepower: 282whp @ 6,800 RPM
  • Torque: 250wtq @ 4,900 RPM

RB vs 2JZ

2JZ

  • Horsepower: 288whp @ 5,800 RPM
  • Torque: 280wtq @ 4,700 RPM

1JZ vs 2JZ

Alright, so you’ve seen the numbers. They 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.

The linear power gain of the RB26 is great for track use, since the power will be predictable when on and off of the throttle. The early power of the 2JZ is great for street use, since you’ll typically be in the lower RPMs.

RB26 vs 2JZ: Engine Strength

It’s 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. The engine blocks are nearly equal in terms of strength.

RB26 vs 2JZ: Parts Availability

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. Since it hasn’t picked up as large of a cult following in the US, the aftermarket isn’t nearly as strong.
Further more, just finding the RB26 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. The large cult following means that the aftermarket is massive and very helpful.

RB26 vs 2JZ: Cool Factor

Let’s be real here, being a bit of a hipster in the JDM community is fairly normal. Everyone is trying to push the envelope from the hellaflush community, to the racing community. In the eyes of a JDM enthusiast, which one is cooler? The RB26 or the 2JZ?

RB26: The RB26 is pretty rare to see in the US. There are quite a few reasons for this but regardless seeing an RB in person is always pretty cool. Furthermore the RB26 is arguably better sounding. It seems a little higher pitched but somehow more angry. It’s a little hard to explain but if you’re a JDM person you may know what I’m talking about.

2JZ: Seeing the 2JZ is far more common is the US. Go to any drift event and you’re bound to find more 2JZ swapped cars than RB26 swapped cars. In that sense that 2JZ has almost got a little bit boring.
The 2JZ’s sound is undeniably iconic, however it has also gotten a little bit stale. This is probably due to the insane amount of MK4 Supra videos on YouTube.

Which One is Better?

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. However, the RB26 is arguably the cooler of the two, mostly due to it’s rarity in the US.

RELATED: 1JZ vs 2JZ: Which One is Actually Better?

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.

RB26vs2JZ3

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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