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The Mitsubishi Lancer Evolution IX (Evo 9) is a beloved performance car, known for its rally heritage and impressive tuning potential. For enthusiasts looking to push the boundaries of their Evo 9’s performance, achieving safe tuning for over 400 horsepower is a common goal. One of the most effective ways to support this power increase is by upgrading the fuel system, specifically through the installation of a Walbro fuel pump and larger fuel injectors.
Why Upgrade Your Fuel System?
When tuning for high horsepower, the stock fuel system often becomes a limiting factor. The Evo 9’s factory fuel pump and injectors may not provide sufficient fuel flow to support increased power levels. Upgrading to a high-performance Walbro fuel pump and larger injectors ensures that your engine receives the necessary fuel for optimal performance and reliability.
Choosing the Right Components
Before diving into the installation process, it’s essential to select the right components for your Evo 9. Here are some recommended choices:
- Walbro 255 LPH Fuel Pump: This pump is a popular choice among Evo enthusiasts for its reliability and performance.
- Larger Fuel Injectors: Consider 850cc or 1000cc injectors to meet the fuel demands of your tuned setup.
Installation Process
Installing a Walbro fuel pump and larger injectors in your Evo 9 can be accomplished with some mechanical knowledge and the right tools. Here’s a step-by-step guide to help you through the process:
Tools and Materials Needed
- Walbro 255 LPH fuel pump
- Larger fuel injectors (850cc or 1000cc)
- Fuel line clamps
- Socket set
- Screwdrivers
- Torque wrench
- Safety glasses
- Fuel line removal tool
Step 1: Preparing the Vehicle
Begin by ensuring your vehicle is parked on a level surface and the engine is cool. Disconnect the negative battery terminal to prevent any electrical issues during the installation.
Step 2: Removing the Fuel Pump
Access the fuel pump by removing the rear seat and the fuel pump cover. Disconnect the fuel lines and electrical connectors from the pump. Carefully remove the fuel pump assembly from the tank.
Step 3: Installing the Walbro Fuel Pump
Replace the stock pump with the Walbro 255 LPH pump. Ensure all seals are properly fitted, and reassemble the fuel pump assembly. Reinstall it into the fuel tank, reconnecting the fuel lines and electrical connectors securely.
Step 4: Replacing the Fuel Injectors
Next, remove the intake manifold to access the fuel rail. Disconnect the fuel lines from the rail, and then remove the rail itself. Carefully remove the stock injectors from the rail and replace them with the larger injectors. Reinstall the rail and reconnect all lines.
Step 5: Final Checks
Before starting the engine, double-check all connections for leaks. Reconnect the battery and start the engine. Monitor for any fuel leaks and ensure the vehicle runs smoothly.
Tuning for Performance
After upgrading your fuel system, it’s crucial to have your vehicle tuned by a professional. Proper tuning will ensure that your Evo 9 runs efficiently and safely at the increased horsepower levels. A performance tune will optimize fuel maps, ignition timing, and other parameters to maximize power while maintaining engine safety.
Conclusion
Upgrading to a Walbro fuel pump and larger fuel injectors is a vital step in achieving safe 400+ horsepower tuning for your Evo 9. With the right components and careful installation, you can significantly enhance your vehicle’s performance and reliability. Always remember to follow up with proper tuning to unlock the full potential of your upgraded fuel system.