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The Mitsubishi Eclipse with a 4G63 engine has become a favorite among car enthusiasts for its potential to achieve impressive horsepower figures. This guide will take you through the steps necessary to upgrade your stock 4G63 engine to reach 500 horsepower, including custom tuning.
Understanding the 4G63 Engine
The 4G63 engine is a turbocharged inline-four engine that has been used in various Mitsubishi models, including the Eclipse. It is known for its robust design and tunability. Before starting the upgrade process, it’s essential to understand the engine’s components and how they contribute to performance.
- Engine block: The foundation of your engine.
- Pistons: Critical for compression and power generation.
- Turbocharger: Increases air intake for more power.
- Fuel injectors: Provide the necessary fuel for combustion.
- ECU: Controls engine parameters and tuning.
Initial Preparations
Before starting the upgrade, ensure that your vehicle is in good condition. Perform a thorough inspection and maintenance check. This includes:
- Change the oil and filter.
- Inspect the cooling system.
- Check the condition of belts and hoses.
- Ensure the fuel system is functioning properly.
Step 1: Upgrading the Turbocharger
The first major upgrade is to replace the stock turbocharger with a larger, more efficient unit. A turbo with a larger compressor wheel will allow more air into the engine, which is essential for increasing horsepower.
- Choose a turbocharger rated for at least 500 horsepower.
- Consider a ball-bearing turbo for quicker spool times.
- Upgrade the turbo manifold if necessary.
Step 2: Fuel System Upgrades
With increased airflow from the new turbo, you will need to upgrade the fuel system to ensure adequate fuel delivery.
- Install larger fuel injectors (1000cc or more).
- Upgrade the fuel pump to support higher flow rates.
- Consider a fuel pressure regulator to maintain optimal pressure.
Step 3: Engine Internals
To handle the increased power, upgrading the engine internals is crucial. Stock components may not withstand the stress of 500 horsepower.
- Replace stock pistons with forged pistons for better durability.
- Upgrade connecting rods to handle higher power output.
- Consider a performance crankshaft if necessary.
Step 4: Exhaust System Upgrade
A high-flow exhaust system will help reduce back pressure and improve overall engine efficiency.
- Install a larger diameter downpipe.
- Upgrade to a high-performance cat-back exhaust system.
- Consider a test pipe or high-flow catalytic converter.
Step 5: Engine Management and Tuning
After all mechanical upgrades, custom tuning is essential to optimize performance. A proper tune ensures that the engine runs efficiently and safely at higher power levels.
- Install a standalone engine management system or a piggyback ECU.
- Use a wideband O2 sensor for accurate air-fuel ratio readings.
- Consult a professional tuner experienced with the 4G63 engine.
Step 6: Testing and Fine-Tuning
Once the tuning is complete, it’s crucial to test the vehicle under various conditions. Monitor performance and make adjustments as necessary to ensure reliability and power.
- Perform dyno testing to verify horsepower and torque numbers.
- Check for any leaks or issues in the upgraded components.
- Make adjustments to the tune based on test results.
Conclusion
Upgrading a 4G63 engine to 500 horsepower is an exciting project that requires careful planning and execution. By following these steps and ensuring each component is upgraded appropriately, you can achieve impressive performance while maintaining reliability. Always remember to prioritize safety and seek professional assistance when necessary.