Installing Sti Vf39 Turbo Mods: a Complete Step-by-step Guide

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Installing a VF39 turbo on your Subaru STI can significantly enhance performance and driving experience. This guide will provide a comprehensive step-by-step process to help you install the VF39 turbo mods effectively.

Tools and Materials Needed

  • Socket set
  • Wrench set
  • Torque wrench
  • Flathead and Phillips screwdrivers
  • Boost gauge
  • New turbo gaskets
  • Silicone hoses
  • Oil and coolant
  • Wastegate actuator

Preparation Steps

Before starting the installation, ensure you have all tools and materials ready. Follow these preparation steps:

  • Disconnect the battery.
  • Drain the engine oil and coolant.
  • Remove the intake and intercooler piping.
  • Take off the stock turbocharger.

Removing the Stock Turbocharger

To install the VF39 turbo, you first need to remove the stock turbocharger. Follow these steps:

  • Remove the heat shield covering the turbo.
  • Unbolt the downpipe from the turbo.
  • Disconnect the oil and coolant lines.
  • Unbolt the turbo from the exhaust manifold.
  • Carefully lift out the stock turbo.

Installing the VF39 Turbo

Now that the stock turbo is removed, you can install the VF39 turbo. Follow these steps:

  • Position the VF39 turbo onto the exhaust manifold.
  • Secure the turbo with the bolts, ensuring they are torqued to manufacturer specifications.
  • Reconnect the oil and coolant lines to the turbo.
  • Attach the downpipe to the VF39 turbo.
  • Install the new turbo gaskets to prevent leaks.

Connecting the Wastegate Actuator

After installing the turbo, you need to connect the wastegate actuator. Here’s how:

  • Attach the wastegate actuator to the VF39 turbo.
  • Ensure the actuator arm moves freely.
  • Check all connections for tightness.

Reinstalling the Intake and Intercooler Piping

With the turbo installed, it’s time to reinstall the intake and intercooler piping:

  • Reconnect the intake piping to the turbo.
  • Attach the intercooler to the intake piping.
  • Ensure all clamps are tight and secure.

Final Steps and Checks

After everything is installed, follow these final steps:

  • Reconnect the battery.
  • Refill the engine oil and coolant.
  • Start the engine and check for leaks.
  • Monitor boost levels with the boost gauge.

Tuning Your STI

After the installation, it’s crucial to tune your STI for optimal performance. Consider the following:

  • Visit a professional tuner for proper mapping.
  • Adjust fuel and ignition timing as needed.
  • Ensure the car runs smoothly with the new turbo setup.

Conclusion

Installing a VF39 turbo on your Subaru STI can greatly improve performance. By following this step-by-step guide, you can ensure a successful installation. Always remember to tune your vehicle for the best results.