Sti turbo

Types of STI Turbo

• Single turbo

  Single-turbochargers are the most common form of turbo technology found in many vehicles today. In a single-turbo system, one turbocharger is connected to the exhaust system of each engine cylinder. This enables the turbo to utilize the exhaust gases produced by the engine to spin a turbine and draw in additional airflow from the outside into the engine. The increased airflow from the single turbo boosts the power output and performance of the vehicle.

• Twin turbo

  Twin-turbo systems are often reserved for high-performance vehicles with powerful engines. In a twin-turbo setup, two turbochargers are connected to the exhaust system. This configuration allows for even greater utilization of the exhaust gases and enables more airflow into the engine, resulting in a significant boost to the power output compared to single-turbo systems. Some twin-turbo setups also feature variable geometry turbochargers, which further optimize the airflow and performance characteristics of the system.

• Variable-geometry turbocharger (VGT)

  Variable-geometry turbochargers (VGTs) are designed to improve the lag time commonly associated with traditional turbo systems. By adjusting the angle of the guide vanes in the turbine housing, VGTs can optimize the airflow through the turbocharger at different engine speeds. This results in a more efficient turbo that spools up quicker, reducing lag and providing a more linear power delivery. As a result, VGTs are often utilized in diesel engines to enhance responsiveness and overall performance.

• Electric turbo compresso

  Electrically powered turbos are an emerging technology aimed at further eliminating turbo lag. By using electricity, usually from a supercapacitor, to drive the compressor, these electric turbines can spin up to speed almost instantaneously. This allows the compressor to match the driver's throttle input more closely, providing boost on demand without any delay. While electric turbos are still relatively new to the automotive industry, they hold great promise for improving performance and efficiency in the future.

Specifications and maintenance of STI Turbo

• 1. Regular Oil Changes

  Maintaining proper engine oil levels and utilizing high-quality oil is essential for turbocharger health. Oil changes should occur per recommended intervals or more frequently if driving under stress. Fresh oil lubricates moving parts, dissipates heat, and minimizes deposits that could block oil passages.

• 2. Cool Down Periods

  After turbocharged engines have been subjected to heavy load or high-speed driving, allow them to idle for several minutes prior to shutdown. This cooling period lets the turbo spool gradually lower temperature and prevent oil coking that could damage bearings.

• 3. Intercooler Inspection

  Inspecting the intercooler for leaks or blockages is important to maintain its function of cooling intake air from the turbo. Even minor issues can cause temperature rises that reduce performance. The intercooler should be checked visually, and airflow tested periodically, especially in high-use applications.

• 4. Wastegate and BOV Check

  Wastegate operation is essential for regulating turbo boost levels. The wastegate actuator should be examined, along with vacuum lines, to ensure proper function. Likewise, a bov must work correctly to vent excess pressure and prevent compressor surge. Both components require periodic inspection and maintenance to avoid boost issues.

• 5. Intake and Exhaust Health

  Intake and exhaust systems are critical for airflow to and from the turbo. Air filters should be replaced regularly, while exhaust components like catalytic converters require inspection for blockages or damage. Restricted airflow can sap power and strain the turbocharger.

• 6. Turbo Flange Bolts

  Turbochargers are connected to the exhaust manifold and downpipe via flanges. The bolts on these flanges should be checked periodically and tightened if necessary. Loose fasteners can cause leaks that affect turbo function and may lead to more serious problems over time.

• 7. High-Quality Replacement Parts

  When repairs or replacements are needed, only use high-quality components designed for the specific turbo system should be used. OEM or reputable aftermarket parts help maintain reliability and performance. Avoid cheap knockoffs that may not meet standards and could cause failures.

• 8. Temperature Monitoring

  Some enthusiasts install gauges to monitor exhaust gas temperatures, turbo inlet temperatures, and other parameters in real-time. This provides advanced warning of potential issues like overheating. Tuning solutions can also be used to optimize turbo performance while staying within safe limits.

How to Choose Subarus Turbocharger

When looking for the right turbocharger, it's important to consider the needs of Subaru turbo models. Ensure the turbocharger can withstand the demands of turbocharged engines.

• Warranty:

  Subaru turbochargers are not cheap. As a result, buyers should look for a warranty period that offers protection in case of an untimely failure. A warranty could save car owners a lot of money.

• Professional Installation:

  Buying a turbocharger with the intention of installing it without professional help? Think again. It's important to consider whether the turbocharger can be installed without professional help. Finding out the answers to these questions before purchasing is essential. Installing a turbocharger can be very complex and requires a lot of knowledge.

• Cost:

  When purchasing a turbocharger for a Subaru, the cost is an important factor. Determine how much will fit into the budget and find a turbocharger that offers the best performance for the price. Remember to factor in the cost of professional installation if needed.

How to DIY and Replace STI Turbos

Subaru turbo kits can be replaced with proper mechanical knowledge and skills. Here is a step-by-step guide on how to replace the Subaru turbo.

• Preparation

  Prepare by disconnecting the negative cable from the battery. Also, assemble all the necessary tools for the job, including a socket set, wrenches, and torque wrench. Once the battery is disconnected, the electrical system will be safe from short circuits, and the mechanic will be free to handle all the electrical components.

• Remove the old turbo

  Start by draining the engine oil and coolant. Next, remove the intake and exhaust manifold connections to access the turbo. Then, disconnect the wastegate actuator and blow off valves to get a better reach of the turbo. After that, remove the oil feed and return lines. The oil lines are connected to the engine and the turbo. They transfer oil to lubricate the turbo and allow for proper oil drainage back to the engine. Use a wrench to disconnect the oil lines and allow for easy removal of the oil lines. Once all the lines are disconnected, remove the bolts holding the turbo to the exhaust manifold and carefully lift the turbo out of the engine bay. Be careful not to damage the gasket or the mating surfaces.

• Install the new turbo

  Start by carefully placing the new turbo onto the exhaust manifold and securing it with bolts. Make sure the gaskets are in the right place to prevent leaks. Then, reconnect the oil feed and return lines. After that, reattach the wastegate actuator and blow-off valve. Once done, connect the intake and exhaust manifold connections.

• Final steps

  Refill the engine oil and coolant. Double-check all the connections and ensure there are no leaks. After that, start the engine and let it idle for a few minutes. Then, take the car for a test drive and ensure everything is working as it should. The process is complete.

Q&A

Q1: How can one know if a car has a turbo?

A1: There are a few ways to tell if a car is turbocharged. One of the easiest ways to tell is by looking at the exhaust pipes. If the car is turbocharged, it will have dual exhaust pipes. Another way to tell if a car has a turbo is by opening the hood and looking at the engine. If the car has a turbo, there will be a tube going from the engine to the exhaust called the ""twin-scroll turbo."" There will also be a turbo badge somewhere on the engine.

Q2: What does an STI turbo do?

A2: An STI turbo forces more air into the engine, allowing it to burn more fuel and produce more power. The turbo spins a turbine that is driven by the exhaust gases leaving the engine. As the turbine spins, it forces air into the engine through a compressor.

Q3: How long does an STI turbo last?

A3: With proper maintenance and care, an OEM turbo can last up to 100,000 miles. The lifespan of a turbo can be affected by several factors, such as driving habits, engine oil changes, and the quality of engine oil used.

Q4: Can users upgrade to a larger turbo?

A4: Yes, it's possible to upgrade to a larger turbo. A larger turbo can provide more power but may require additional modifications to the exhaust and intake systems. The STI OEM turbo can also be replaced with a Garrett turbo, BorgWarner turbo, or Blouch turbo.

Q5: Can a turbo be fitted to a non-STI Subaru Impreza?

A5: Yes, it's possible to install a turbo on a non-STI Subaru Impreza. Several aftermarket kits are available to add a turbocharger to naturally aspirated (NA) engines. However, it's best to consult with a professional mechanic before attempting the modification.