Table of Contents
The Subaru WRX is known for its performance and tuning potential. One of the most effective upgrades for enhancing engine performance is the installation of a fast intake manifold. This guide will provide a detailed, step-by-step process for installing a fast intake manifold on a Subaru WRX, as well as the expected performance results.
Tools and Materials Needed
- Fast intake manifold kit
- Socket set
- Torque wrench
- Screwdrivers (flathead and Phillips)
- Gasket scraper
- Cleaning supplies (rags, brake cleaner)
- Silicone sealant
- Vacuum hose cutter
- Safety glasses
Preparation
Before starting the installation, it is essential to prepare your workspace and gather all necessary tools and materials. Ensure that your Subaru WRX is parked on a flat surface and that the engine is cool to avoid burns.
Disconnect the Battery
For safety, disconnect the negative terminal of the battery. This will prevent any electrical shorts while working on the engine.
Remove Engine Covers
Remove any plastic engine covers or components obstructing access to the intake manifold. This may include the air intake duct and throttle body.
Removing the Stock Intake Manifold
With the engine exposed, it’s time to remove the stock intake manifold. Follow these steps carefully to avoid damaging any components.
Detach Throttle Body and Sensors
Carefully disconnect the throttle body and any sensors attached to the stock intake manifold. Label the connections if necessary to ensure proper reinstallation.
Unbolt the Intake Manifold
Using a socket set, unbolt the intake manifold from the engine block. Be sure to keep track of the bolts for reinstallation.
Remove the Old Gasket
Once the manifold is removed, use a gasket scraper to clean the surface of the engine block, ensuring no old gasket material remains. This is crucial for a proper seal with the new manifold.
Installing the Fast Intake Manifold
Now that the stock manifold is removed, it’s time to install the fast intake manifold. Follow these steps for a successful installation.
Prepare the New Manifold
Inspect the new fast intake manifold for any defects. Apply a thin layer of silicone sealant on the gasket surface to ensure a proper seal.
Position the New Manifold
Carefully position the new manifold onto the engine block, aligning it with the bolt holes. Ensure that all ports and connections are properly aligned.
Secure the Manifold
Using the original bolts, secure the manifold to the engine block. Use a torque wrench to tighten the bolts to the manufacturer’s specifications.
Reconnecting Components
With the new manifold in place, it’s time to reconnect all components that were detached during the removal process.
Reattach Throttle Body and Sensors
Reconnect the throttle body and any sensors, ensuring that all connections are secure and correctly positioned.
Replace Engine Covers
Reinstall any engine covers or components that were removed earlier, ensuring that everything is securely fastened.
Final Steps
Before starting the engine, double-check all connections and ensure that no tools or debris are left in the engine bay. Reconnect the battery’s negative terminal.
Performance Results
After the installation, it’s essential to evaluate the performance improvements. Many Subaru WRX owners report significant gains in horsepower and torque after installing a fast intake manifold. The following are common performance results:
- Increased horsepower by 15-25 HP
- Improved throttle response
- Enhanced engine efficiency
- Better airflow and reduced intake temperatures
Conclusion
Installing a fast intake manifold on a Subaru WRX can significantly enhance performance and driving experience. By following this step-by-step guide, you can successfully complete the installation and enjoy the benefits of improved horsepower and efficiency.