How to Install Restrictor Pill Subaru WRX

If you own a Subaru WRX and are looking to increase its horsepower and torque, installing a restrictor pill might be just the upgrade you need. A restrictor pill is a small, brass plug that restricts the flow of air to the turbocharger, increasing the turbo’s efficiency and allowing it to produce more boost. In this article, we’ll walk you through the process of installing a restrictor pill in your Subaru WRX, step-by-step.

Key Takeaways

  • Installing a restrictor pill can increase the horsepower and torque of your Subaru WRX.
  • A restrictor pill restricts the flow of air to the turbocharger, increasing efficiency and allowing the turbo to produce more boost.
  • You should only install a restrictor pill if you have upgraded your turbocharger or modified your engine in some way.

What You’ll Need

  • A restrictor pill kit (available online or at your local auto parts store)
  • A socket wrench set
  • A jack and jack stands (or a lift)
  • Safety glasses
  • Gloves
  • A flathead screwdriver

Step-by-Step Guide

Step 1: Prepare Your Vehicle

Before you begin, make sure your vehicle is on a level surface and that the engine is cool. Put on your safety glasses and gloves to protect your eyes and hands.

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Step 2: Locate the Restrictor Pill

The restrictor pill is located in the banjo bolt that connects the oil supply line to the turbocharger. You will need to remove the banjo bolt in order to access the restrictor pill.

Step 3: Remove the Banjo Bolt

Use a socket wrench set to remove the banjo bolt. Make sure to place a drain pan underneath the bolt to catch any oil that may leak out.

Step 4: Remove the Restrictor Pill

Using a flathead screwdriver, carefully remove the restrictor pill from the banjo bolt. Be gentle, as the pill is fragile and can break if mishandled.

Step 5: Install the New Restrictor Pill

Take the new restrictor pill from your restrictor pill kit and insert it into the banjo bolt. Make sure it is securely in place.

Step 6: Reinstall the Banjo Bolt

Carefully reinstall the banjo bolt and tighten it using your socket wrench set. Make sure to use the correct torque setting for your vehicle.

Step 7: Start Your Engine

Start your engine and let it run for a few minutes to ensure everything is working properly. Check for any leaks or unusual sounds.

Step 8: Enjoy Your Upgraded Turbocharger

Congratulations, you have successfully installed a restrictor pill in your Subaru WRX. Enjoy the increased horsepower and torque that your upgraded turbocharger will provide.

FAQs

Q: Can I install a restrictor pill on a stock Subaru WRX?

A: No, you should only install a restrictor pill if you have upgraded your turbocharger or modified your engine in some way.

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Q: How often should I check my restrictor pill?

A: You should check your restrictor pill every time you perform routine maintenance on your vehicle, such as an oil change.

Q: How do I know if my restrictor pill is working properly?

A: If your turbocharger is producing more boost and you are experiencing an increase in horsepower and torque, your restrictor pill is working properly.

Conclusion

Installing a restrictor pill in your Subaru WRX can be a great way to increase the horsepower and torque of your vehicle. Just make sure to follow the steps outlined in this article carefully, and only install a restrictor pill if you have upgraded your turbocharger or modified your engine in some way. With the right tools and a little bit of patience, you can easily install a restrictor pill in your Subaru WRX and enjoy the benefits of an upgraded turbocharger.

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Davis Bellew

As a Subaru owner and enthusiast, Davis has a deep understanding of the needs and concerns of Subaru drivers. He specializes in writing informative and engaging content about Subaru maintenance and repair, and his articles are always well-researched and easy to understand. When he's not writing, he enjoys hiking and photography.

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