Subaru wrx sti engine upgrade guide: ej20 vs. ej25 – which is right for you?
What To Know
- If you are looking for a lightweight engine that produces a lot of power at high RPMs, then the EJ20 engine is a good choice.
- If you are looking for an engine that produces more torque at low RPMs and is more fuel-efficient, then the EJ25 engine is a good choice.
The Subaru WRX STI is a legendary performance car that has been around for decades. Over the years, it has been powered by a variety of different engines, but two of the most popular are the EJ20 and EJ25. Both of these engines are turbocharged flat-fours, but they have some key differences that make them unique. In this blog post, we will take a closer look at the EJ20 and EJ25 engines and compare them side-by-side.
The EJ20 Engine
The EJ20 engine is a 2.0-liter turbocharged flat-four engine that was first introduced in the Subaru Impreza WRX in 1992. It is a relatively small engine, but it is capable of producing a lot of power. The EJ20 engine is known for its high-revving nature and its impressive performance. It is also relatively lightweight, which makes it ideal for use in performance cars.
The EJ25 Engine
The EJ25 engine is a 2.5-liter turbocharged flat-four engine that was first introduced in the Subaru Impreza WRX STI in 2004. It is a larger engine than the EJ20, and it produces more power. The EJ25 engine is known for its low-end torque and its smooth power delivery. It is also more fuel-efficient than the EJ20 engine.
EJ20 vs EJ25: Which Engine is Right for You?
The EJ20 and EJ25 engines are both excellent engines, but they have some key differences that make them unique. The EJ20 engine is smaller and lighter, and it produces more power at high RPMs. The EJ25 engine is larger and heavier, but it produces more torque at low RPMs and it is more fuel-efficient.
Ultimately, the best engine for you will depend on your individual needs and preferences. If you are looking for a lightweight engine that produces a lot of power at high RPMs, then the EJ20 engine is a good choice. If you are looking for an engine that produces more torque at low RPMs and is more fuel-efficient, then the EJ25 engine is a good choice.
EJ20 vs EJ25: Key Differences
Here is a table that summarizes the key differences between the EJ20 and EJ25 engines:
| Feature | EJ20 | EJ25 |
| — | — | — |
| Displacement | 2.0 liters | 2.5 liters |
| Power | 227-305 horsepower | 265-305 horsepower |
| Torque | 217-290 lb-ft | 244-290 lb-ft |
| Weight | 400-450 pounds | 450-500 pounds |
| Fuel economy | 20-25 mpg | 22-28 mpg |
EJ20 vs EJ25: Reliability
Both the EJ20 and EJ25 engines are generally reliable, but they can have some common problems. The EJ20 engine is known for its head gasket problems, while the EJ25 engine is known for its ringland failure problems. However, these problems can be avoided by following proper maintenance procedures.
EJ20 vs EJ25: Modifications
Both the EJ20 and EJ25 engines are popular choices for modification. There are a variety of aftermarket parts available for both engines, which can help to improve their performance and reliability. Some of the most popular modifications include:
- Turbo upgrades
- Intercooler upgrades
- Exhaust upgrades
- Engine management upgrades
- Suspension upgrades
EJ20 vs EJ25: Conclusion
The EJ20 and EJ25 engines are both excellent engines with their own unique strengths and weaknesses. Ultimately, the best engine for you will depend on your individual needs and preferences. If you are looking for a lightweight engine that produces a lot of power at high RPMs, then the EJ20 engine is a good choice. If you are looking for an engine that produces more torque at low RPMs and is more fuel-efficient, then the EJ25 engine is a good choice.
Basics You Wanted To Know
Q: Which engine is more powerful, the EJ20 or the EJ25?
A: The EJ25 engine is more powerful than the EJ20 engine. It produces more horsepower and torque.
Q: Which engine is more fuel-efficient, the EJ20 or the EJ25?
A: The EJ25 engine is more fuel-efficient than the EJ20 engine. It gets better gas mileage.
Q: Which engine is more reliable, the EJ20 or the EJ25?
A: Both the EJ20 and EJ25 engines are generally reliable, but they can have some common problems. The EJ20 engine is known for its head gasket problems, while the EJ25 engine is known for its ringland failure problems. However, these problems can be avoided by following proper maintenance procedures.
