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WRX STi EJ20G engines
The Subaru WRX STI EJ20G engines were produced between 1989 and 1998. The Subaru WRX STI EJ20G engines are used in some Subaru models like Legacy and Forester. The Subaru WRX STI EJ20G engines use a turbocharged double DOHC 4-cylinder horizontal opposed (boxer) 2.0-liter (1985 cc) engine. The Subaru WRX STI EJ20G engine has a compression ratio of 8.0:1. The Subaru WRX STI EJ20G engine has a liquid-cooled intercooler to reduce the charge air temperature. The Subaru WRX STI EJ20G engine can produce up to 130 kW (180 PS) at 6,000 rpm and 294 N·m (217 lb·ft) at 3,000 rpm.
WRX STi EJ25 engine
The Subaru WRX STI EJ25 engines were produced between 2004 and 2021. The Subaru WRX STI EJ25 engines are used in some models like WRX STi and WRX STi RA-R. The Subaru WRX STI EJ25 engines use a turbocharged double DOHC 4-cylinder horizontal opposed (boxer) 2.5-liter (2457 cc) engine. The Subaru WRX STI EJ25 engine has a compression ratio of 8.0:1 or 8.5:1. The Subaru WRX STI EJ25 engines also have a liquid-cooled intercooler to reduce the charge air temperature. The Subaru WRX STI EJ25 engine can produce up to 200 kW (272 PS) at 6,000 rpm and 392 N·m (289 lb·ft) at 3,000 rpm.
WRX STi FA20F engine
The Subaru WRX STI FA20F engines were produced between 2014 and 2019. The Subaru WRX STI FA20F engines are used in some models like WRX STi and WRX STi S207. The Subaru WRX STI FA20F engine is a turbocharged DOHC 4-cylinder boxer 2.0-liter (1998 cc) engine. The Subaru WRX STI FA20F engine has a compression ratio of 10.0:1 or 10.5:1. The Subaru WRX STI FA20F engine also has a liquid-cooled intercooler. The Subaru WRX STI FA20F engine can produce up to 221 kW (300 PS) at 6,000 rpm and 400 N·m (295 lb·ft) at 2,000 rpm.
WRX STi S4 engine
The Subaru WRX STI S4 engine was produced between 2015 and 2021. The Subaru WRX STI S4 engine is a turbocharged DOHC 4-cylinder boxer 2.0-liter (1998 cc) engine. The Subaru WRX STI S4 engine has a compression ratio of 10.0:1. The Subaru WRX STI S4 engine can produce up to 221 kW (300 PS) at 6,000 rpm and 400 N·m (295 lb·ft) at 2,000 rpm.
Regular Oil Changes
Engine oil lubricates and protects internal engine components. The oil should be replaced every 6,000 miles or as recommended in the owner's manual. Use the specified oil grade (typically 5W-30) to ensure proper engine function.
Coolant Flushes
Subaru WRX STI engines generate heat, especially when driving hard. The cooling system needs fresh coolant every 30,000 miles to prevent corrosion. This helps the car run at optimal temps, which protects the engine.
Air Filter Replacements
The air filter should be checked and changed every 15,000 miles or more often if driving in dusty conditions. A clean filter ensures the engine gets proper airflow, which maximizes power and fuel efficiency.
Spark Plug Changes
Premium WRX STI engines typically use iridium spark plugs. These should be inspected around 30,000 miles and replaced if worn. Healthy plugs provide a strong spark to fully burn fuel, maximizing performance.
Timing Belt/Water Pump Service
The timing belt should be changed per the mileage or age interval in the owner's manual (often 105,000 miles). The water pump is usually replaced at the same time. This prevents costly engine damage from belt failure.
Throttle Body Cleaning
The throttle body controls how much air enters the engine. It should be cleaned with a throttle body cleaner every 60,000 miles to remove any gunk. This helps maintain smooth acceleration and optimal air intake.
Rear Differential Fluid Changes
The rear differential fluid should be replaced every 30,000 to 60,000 miles (or as needed). New fluid lubricates d differential gears, ensuring reliable power transfer to the rear wheels. This is especially important for WRX STI models with rear diff centers.
There are several factors that need to be considered when choosing a WRX STI engine. In most cases, it comes down to what the buyers want. Below are some of the factors to consider:
Power output:
The primary factor to consider when choosing a WRX STI engine is the power output. Different engines produce different horsepower and torque outputs. Buyers should choose an engine whose power output meets their needs. If they want more power, they should be ready to upgrade other components in the vehicle.
Emissions regulations:
Emission regulations are another important factor to consider when choosing a car engine. Different countries have set regulations that limit the amount of emissions a car can produce. Before buying an engine, make sure to check the emission standards in the area.
Fuel efficiency:
Fuel efficiency is another important factor to consider when choosing a WRX STI engine. Some engines are designed with fuel efficiency in mind. They use technologies like turbocharging to squeeze more power without using more fuel.
Engine size:
The engine size is also an important factor to consider when choosing a WRX STI engine. The smaller engines provide better fuel efficiency, while the larger engines provide more power.
Cost:
The cost of the engine is the last thing to consider when choosing a WRX STI engine. Before buying an engine, make sure it fits within the budget. Remember that the more powerful and efficient an engine is, the more it will cost.
Subaru WRX owners intending to replace the engine should have a solid understanding of car engines and repair. Replacing a car engine is a complicated task that requires expert knowledge. Here is a basic guide for replacing a WRX STI engine.
Select a suitable new engine:
Subaru WRX car owners should select an engine that is compatible with their car's make and model. An engine with similar specifications to the original one provides a smooth transition. It also eliminates numerous adjustments that may be difficult to implement. Car owners can choose between a remanufactured, refurbished, or new engine. Each of these options is affordable and sustainable in its own way.
Collect the necessary tools:
Mechanics and car owners replacing the engine should have various tools at their disposal. These tools include an engine hoist, jack stands, and basic hand tools. It's also important to have a good understanding of electrical systems in cars. This knowledge will come in handy when reconnecting wires and sensors. Some of the other important tools include a torque wrench and a multimeter for testing.
Prepare the vehicle:
Once the car owner has selected a suitable new engine and collected the necessary tools, it's time to prepare the vehicle. Preparing the vehicle entails draining all the fluids and removing several components to access the engine easily. These components include the exhaust system, intake system, and cooling system. Disconnecting the battery is also important for safety purposes.
Remove the old engine:
After preparing the vehicle, the next step is removing the old engine. Old engine removal involves using an engine hoist to lift the engine out of the car. Afterwards, the car owner or mechanic should disconnect all the remaining wires, hoses, and lines. They should also remove the intake, exhaust, and cooling systems. It's essential to follow the manufacturer's instructions during this process to avoid damaging the vehicle.
Install the new engine:
Installing the new engine is basically the opposite of removing it. First, the mechanic or car owner should lower the new engine onto the vehicle using an engine hoist. Then, they should reconnect all the previously disconnected wires, hoses, and lines. Reinstalling the intake, exhaust, and cooling systems is also important. Car owners should adhere to the manufacturer's torque specifications when tightening bolts and fittings.
Final preparations:
Once the new engine is installed, it's important to refill all the fluids that were drained earlier. These fluids include oil, coolant, and transmission fluid. Before starting the engine, car owners should double-check all the connections and ensure there are no leaks. They should also follow the manufacturer's guidelines during every step of the process. This ensures the engine runs smoothly and efficiently after replacement.
Q1: How can I make my WRX STI engine sound better?
A1: To enhance the engine sound, consider upgrading to a performance exhaust system. While ensuring that any modifications comply with local noise regulations, intake system upgrades can also change the engine note.
Q2: What should I do if my engine runs hot?
A2: If the engine is running hot, immediately stop using it and allow it to cool. Check the cooling system, including the coolant level, for leaks, and ensure the thermostat and radiator are functioning properly.
Q3: What is the best oil to use for the WRX STI engine?
A3: Stick to the recommended oil by the manufacturer. This is usually a high-quality synthetic oil with the recommended viscosity rating. This will ensure optimal engine performance and durability.
Q4: How often should I replace the spark plugs?
A4: Depending on the type and condition, a standard replacement interval is every 30,000 to 60,000 miles. Always inspect them regularly for wear or damage.
Q5: What modifications can increase engine performance?
A5: Consider upgrading the air intake system, intercooler, and exhaust system or adding a performance tune to increase engine performance. Ensure that all modifications are compatible and safely installed.
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