The S30 chassis with a modern engine is a dream car enthusiasts share. Do you want to go with the SR20DET RB25DET or maybe the RB20DET for your build? If so you're in good company.
When you swap out the S30's original engine you are adding new power and reliability but you'll also face some challenges. Usually speaking you'll see gains in performance and some installation hurdles. They are just part of the process. Each engine has its own benefits and trade-offs depending on what you're after. The lightweight and rev-happy SR20DET, the powerful RB25DET and the ultra-reliable RB20DET all can give you something.
When you learn about the strengths and challenges of each engine it will help you make a good choice. Usually you just need to take into account your specific goals and what you're looking for in the end.
Let's get started!
Disclaimer: This article is authored by a member of the Skillard community and reflects their personal views, not necessarily those of Skillard. We welcome your feedback and corrections in the comments to help us continually improve this content.
The SR20DET Engine
The SR20DET engine is a popular choice for the S30 chassis - this engine which started in 1989 comes from the Nissan U12 Bluebird 2000SSS. Over the years it earned classic status in models like the Nissan Silvia series (S13 S14 and S15) and the 180SX. You can see why it has a legendary status can't you?
The design of the SR20DET is great. It has a 2.0-liter DOHC 16-valve setup with a turbocharger. When you depend on the model year you get Garrett T25G T28 or T28R turbochargers. Later models even come with Nissan's VTC (Variable Timing Control) system - this feature improves performance across different RPMs which is a big deal.
This engine delivers between 201 hp and 247 hp with torque figures ranging from 196 lb-ft to 207 lb-ft. When it comes to its lightweight aluminum construction that's some serious punch. The power-to-weight ratio makes it a fun option for driving enthusiasts. You'll find the power upgrade fun won't you?
For compatibility with the S30 chassis the SR20DET's compact size and lightweight nature fit snugly within the engine bay. Custom engine mounts, changing the cooling system, and modifying the wiring are a few tasks ahead - this project will need effort but is easy and rewarding. Think of it as a challenge that pays off in the end.
You can look up real-world examples to study successful swaps. They can be inspiring. Also challenges like fabricating mounts and adapters when you install a high-performance cooling system and upgrade the oil supply should be tackled. It will help you stay away from common dangers.
You could like the SR20DET over other engines because of its high power-to-weight ratio and good aftermarket support. Its small size makes it easier to fit into tighter engine bays. You can also upgrade to more advanced cylinder heads like the SR20VE and it gives even more flexibility to your build. The choice has benefits that can really help your project's success.
When compared to the stock S30 engine usually L24 L26 or L28 the SR20DET has better performance and efficiency plus modern design. Stock engines are reliable but bigger and heavier which results in less nimble handling. With the SR20DET you get newer engineering and power improvements. It will change your driving experience.
Some could think the SR20DET lacks reliability. From my experience with maintenance and upgrades, it can be a very strong and reliable engine. The resources and case studies out there show the durability and reliability of well-maintained SR20DETs. Even when pushed to high power outputs, this information can give you reassurance about your decision.
You'll need specific parts like custom or aftermarket engine mounts, an S13 or S14 transmission, and a custom-length driveshaft. A custom exhaust system, new fuel pump, and other custom fabrications are also necessary - this project isn't for the faint-hearted but if you're motivated the rewards are worth it. Are you up for this challenge?
The traits of the SR20DET make it a good option. The benefits it has can really add to your car's performance and driving enjoyment. Now let's talk about the attributes that set the RB25DET apart.
The RB25DET Engine
The RB25DET engine has some features that make it a great choice for your S30.
You're getting a 2.5-liter inline-six turbocharged engine with a dual overhead camshaft setup and it delivers reliable power and torque. It puts out up to 250 HP and 235 lb-ft of torque in its standard form. You can safely push it to 400 HP with the stock internals and hit 500 HP with the right modifications - this upgrade potential makes it a pretty strong option.
Now the extra weight could seem like a bit of an issue. The RB25DET is heavier than the SR20DET by around 80 kg. Even though it has lots of strength and durability, it could feel like a trade-off. Just to give an example, the engine's compression ratio and turbo along with Nissan's Variable Cam System give it wild durability and adaptability. Sure, the weight could slightly affect how your car works. But it's worth it if you're chasing more power. The engine's toughness makes up for the downside of the extra weight.
What's worth mentioning is the community support for the RB25DET is also a big plus. When you're thinking about this swap, the network of enthusiasts and resources available can really come in handy. Forums like NICOclub and dedicated websites can give you mod tips, troubleshoot advice, and firsthand swap stories. Lots of S30s have successfully run beefed-up RB25DETs, which shows just how feasible and fun this swap can be. You'll always be able to find some help and input throughout your entire project.
Did you know the NEO head features better lifters and a reworked camshaft? Even with all its strengths, the RB25DET can be a bit tricky and expensive to deal with. The cheaper and easier RB20DET could draw anyone working with a tighter budget. Lower maintenance costs make it a helpful choice for those going for an easier project.
Always remember that you will also need custom engine mounts, adapted wiring, upgraded cooling, a stronger transmission, and drivetrain if you're thinking about the swap. This project will need investment but you end up with performance gains that can change your S30 into either a track beast or a street-legal powerhouse.
The RB25DET stands out because it has a great combination of power and advanced technology. In my experience, an S30 with an RB25DET under the hood gives a fun driving experience. Not many setups can match its performance and modern features, which makes it a great option to remember.
That said, you could find the RB20DET fits your needs a little better. Let's talk about that one next.
The RB20DET Engine
The RB20DET for your S30 can be a popular choice. You should really think about the pros and cons before you make your decision.
When thinking about engines, the RB20DET has good performance with a displacement of 1998cc. It puts out 160 kW (214 bhp) at 6400 rpm and 263 Nm (194 ft-lbs) of torque at 3200 rpm. You'll probably see it as a decent power figure especially since it's sometimes cheaper than the RB25DET and SR20DET.
If you have a tighter budget, this engine gives you a cheaper way to help with your ride. That affordability can really play a part in your decision.
You'll also want to remember the RB20DET's weight and fitment. Its cast-iron block makes it noticeably heavier than the aluminum SR20DET. When you fit this into an S30 it could be a bit tricky because of its weight and size. But don't let that stop you. It's possible. Enthusiasts have done this swap successfully. While it can be more of a challenge the payoff could be a well-balanced strong vehicle if you're up for the extra effort and fabrication work.
Sometimes you could see the RB20DET feels a little lacking in torque in the lower rev range especially if you're used to engines that pull from lower RPMs. With some aftermarket tuning and a bigger turbocharger when you use something like the Garrett GT3071R you can solve that issue. I've seen RB20DET builds push setups to 400-450 bhp after those kinds of upgrades. So if you're after more power the potential is there.
One thing to think about is fuel consumption. The RB20DET averages around 21 mpg (11 liters per 100km). For some that could be a drawback. But if you're more focused on performance than commuting it's a trade-off you could manage. It's something you should factor into your decision.
Aftermarket support for the RB20DET is good. While it could not be quite as large as what you get with the SR20DET you'll still find a good community and lots of parts available. Maintenance is easy. With the right care this engine can be fairly reliable for street and track use. It gives you some peace of mind about long-term ownership.
When you take an S30 with an RB20DET out for a drive the engine's sound and tuning potential give the car some real character. When you hear that turbo spool up and feel the rush of power at peak RPMs it could be part of the experience that draws you in. Enthusiasts like this swap for the joy of pushing the RB20DET to its limits. It really adds to the desirability even if there are a few obstacles along the way.
So we've covered the basics. Now let's see which engine fits your needs best.
Which Engine is Best For Your S30?
The RB engines - especially the RB25DET - can cost quite a bit with the parts and labor involved. On the other hand the SR20DET usually works better if you have a tighter budget. Then you have future costs to think about too because the heavier and harder RB20DET and RB25DET could end up needing more expensive regular maintenance which will help you stay ahead of unpleasant surprises down the road.
Next you should think about power levels. Again, the RB25DET can give you more raw power but it's not as familiar to some. On the other hand the SR20DET and RB20DET can give you good stock performance. They can deliver around 205-220 HP. If you're someone who loves tuning the SR20DET and RB engines have tons of potential. I have seen enthusiasts tune their SR20DETs to deliver up to 600 PS with the right modifications. That kind of ability to push boundaries without needing to majorly change the internals is a big plus. More power usually means more fun behind the wheel!
Another thing to remember is installation costs. RB engines are heavier and longer which could affect the S30's balance and handling. The SR20DET is lighter and more compact. It keeps the chassis balanced and tends to fit in more. Plus you'll find that the bigger aftermarket support can make it easier to install and keep. You'll really like a smoother project experience with fewer issues.
Here's a short overview to think about:
- How much power are you really after?
- Is handling and balance a priority for you?
- Do you have a specific engine sound or driving experience in mind?
- What access do you have to tools and skilled labor?
Now imagine building an S30 drift car. The SR20DET has a lighter weight and better balance and is a comfortable choice for drift fans. But if you're dreaming of high-performance builds the RB25DET could sound interesting, as it has huge power potential plus there's the desirability of having a Skyline engine under the hood!
At the end of the day the goal is to choose what fits your vision. Always take some time to weigh your options. You should think through your goals, ask the experts, and dig into all those online resources at your fingertips. Then you'll be able to pick the engine that lines up with your ambitions.
Build Your Dream Car
What engine sound really gets your heart pumping?
Each choice here has its own rewards and challenges. Match your passion with the driving experience you want - what will make you proud to pop the hood and show off to your friends? The joy of showing off your work is a wonderful motivator!
Next, think about how much time and money you're willing to invest. A good project can balance ambition with practicality. Also, you should think about maintenance and future upgrades too! These little joys and frustrations shape your process. Are you someone who loves fine-tuning every detail for years, or do you like getting your car on the road sooner rather than later? Think about your long-term goals for your S30 - this planning will make your process and the finished car far more satisfying.
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