EJ25 vs FA20: Power, Reliability, and Myths

When comparing the Subaru EJ25 vs FA20 engines, the FA20 stands out as the more reliable option for daily driving and long-term ownership. Its modern design, including direct injection and improved thermal efficiency, ensures better dependability and fuel economy. On the other hand, the EJ25 delivers superior power and torque, making it a favorite among WRX enthusiasts seeking high-performance builds.

The EJ25’s robust aftermarket support allows for extensive tuning potential, but its history of head gasket issues raises concerns for reliability. Meanwhile, the FA20 benefits from Subaru’s commitment to dependability, as seen in models like the Forester and Outback, which consistently rank high in reliability studies. Ultimately, your choice between the Subaru EJ25 vs FA20 depends on whether you prioritize raw power or long-term peace of mind.

Key Takeaways

• The FA20 engine lasts longer and works better for daily use.

• The EJ25 has more power and strength, loved by car fans.

• Taking care of both engines is key to avoid problems.

• Knowing how the engines differ helps you pick the right one.

• Myths about these engines come from confusion; good care improves them.

Subaru EJ25 vs FA20: Performance Comparison

Power Output and Torque

When comparing the Subaru EJ25 and FA20 engines, their power output and torque reveal distinct characteristics. The EJ25 produces 170 horsepower and 170 lb-ft of torque, offering a balanced performance profile. In contrast, the FA20 delivers 197 horsepower and 151 lb-ft of torque, with the 2017-2020 FA20 variant pushing this further to 205 horsepower and 156 lb-ft of torque. This makes the FA20 a more powerful option, especially for those seeking a modern engine with enhanced efficiency.

The EJ25’s torque curve provides a robust low-end response, making it ideal for spirited driving and WRX builds. However, the FA20DIT-powered WRX benefits from a higher compression ratio and Toyota’s direct fuel injection system, which optimizes combustion and enhances performance. These advancements allow the FA20 to excel in high-rev scenarios, making it a favorite among enthusiasts who value precision and refinement.

Driving Experience and Tuning Potential

The driving experience of these engines reflects their design philosophies. The EJ25 offers a raw and engaging feel, with its robust torque delivery making it a joy for WRX enthusiasts. However, its older design can lead to reliability concerns, especially when improper aftermarket parts are used. Blown head gaskets and cracked pistons are common issues in poorly executed builds, which can detract from the overall experience.

On the other hand, the FA20DIT engine shines with its smooth power delivery and advanced engineering. Its wide and straight intake ports optimize cylinder filling, ensuring exceptional performance at high RPMs. This design, combined with its recognition as one of Ward’s AutoWorld’s 10 Best Engines in 2013, highlights its capability for both daily driving and track use. The FA20 also boasts significant tuning potential, thanks to its modern architecture and compatibility with a variety of aftermarket options.

For those prioritizing a reliable and efficient platform, the FA20DIT-powered WRX offers a compelling choice. However, if you’re aiming for a high-performance WRX build with extensive aftermarket support, the EJ25 remains a strong contender.

Subaru EJ25 vs FA20: Reliability Analysis

Common Issues with EJ25

The Subaru EJ25 engine has a reputation for delivering impressive power, but its reliability history raises concerns. Common issues include excessive oil consumption, head gasket failures, and oil starvation during high lateral G-forces. These problems have led to lawsuits and a perception of unreliability among some WRX owners.

Despite these challenges, proper maintenance can mitigate many of these problems. Regular oil changes, using high-quality lubricants, and installing an Air/Oil Separator can significantly reduce the risk of engine failure. Additionally, tuning the EJ25 carefully helps prevent ringland and bearing issues, which are often linked to poor maintenance rather than inherent design flaws.

Common Issues with FA20

The FA20 engine, known for its modern design and efficiency, has fewer widespread reliability concerns compared to the EJ25. However, it is not without its challenges. Some owners report carbon buildup on intake valves due to the direct injection system. This issue can affect performance over time if not addressed. Additionally, the FA20DIT variant in the WRX has been associated with occasional turbocharger failures, though these incidents are relatively rare.

To maintain the FA20’s reliability, you should prioritize regular maintenance. Cleaning the intake system periodically and ensuring proper oil changes can prevent carbon buildup. The FA20’s advanced engineering makes it less prone to catastrophic failures, but neglecting maintenance can still lead to costly repairs.

Maintenance and Longevity

Both engines require diligent maintenance to achieve their full potential. The EJ25 demands more attention due to its older design and known issues. Regular inspections for head gasket leaks and oil consumption are essential. Installing aftermarket solutions like an Air/Oil Separator can also extend its lifespan.

The FA20, with its modern architecture, offers better longevity for daily driving. Its direct injection system improves efficiency, but you must address carbon buildup proactively. Routine maintenance, including oil changes and intake cleaning, ensures the engine remains reliable over time.

When comparing the Subaru EJ25 vs FA20, the FA20 emerges as the more reliable choice for long-term ownership. However, if you’re willing to invest in meticulous maintenance, the EJ25 can still deliver exceptional performance and durability.

Subaru WRX Engines: Debunking Myths

EJ25 Myths

The Subaru EJ25 engine has faced its fair share of myths, many of which stem from misunderstandings or exaggerated claims. One common misconception is that EJ engines are inherently prone to ringland failure. This belief often circulates in aftermarket communities, where improper modifications and neglectful maintenance lead to engine issues. In reality, regular oil changes and avoiding poorly designed aftermarket parts can significantly reduce the risk of such failures. Maintaining a stock engine or using high-quality components ensures reliability.

Another myth suggests that the EJ25’s semi-closed deck block design is weak and unsuitable for high-performance builds. However, expert analyses reveal that this claim lacks merit. The semi-closed deck design provides sufficient structural integrity for most WRX builds, especially when paired with proper tuning. Many enthusiasts continue to rely on the EJ25 for their WRX STis, demonstrating its capability and durability when maintained correctly.

• The EJ257, a variant of the EJ25, has proven reliable with proper care, despite early issues in older models.

• The engine’s popularity among WRX enthusiasts highlights its ongoing relevance in the performance community.

FA20 Myths

The FA20 engine, particularly the FA20DIT variant, has also been the subject of myths. Some believe that its direct injection system leads to inevitable carbon buildup and engine failure. While carbon deposits can occur, Subaru engineers addressed this by combining port fuel injection with direct injection. This dual system minimizes valve deposits and enhances reliability, especially with regular maintenance.

Another myth claims that the FA20 lacks the power potential of older engines like the EJ25. This perception ignores the FA20’s advanced design, which achieves 200 flywheel horsepower at 7,000 RPM. Its higher static compression ratio of 12.5:1 improves thermal efficiency, making it a strong contender for both daily driving and performance builds.

The FA20DIT-powered WRX showcases Subaru’s engineering advancements, proving that modern engines can deliver both power and efficiency. Proper tuning and maintenance allow the FA20 to exceed expectations, debunking the narrative of frequent failures.

These myths often arise from misinformation or improper use of the engine. By understanding the facts and prioritizing maintenance, you can unlock the full potential of either the EJ25 or FA20, depending on your goals.

Choosing between the Subaru EJ25 and FA20 engines depends on your priorities. If you value raw power and extensive tuning potential, the EJ25 offers a thrilling platform for WRX builds. However, its reliability history demands diligent maintenance and careful modifications. On the other hand, the FA20 provides a modern, efficient design that excels in daily driving and long-term ownership. Its advanced engineering ensures smoother performance and fewer common issues.

You should evaluate your goals—whether it’s spirited driving, track days, or dependable commuting. Consulting a Subaru expert can help you make an informed decision tailored to your needs. Both engines have their strengths, but understanding their unique characteristics will guide you toward the right choice.