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The Mitsubishi Eclipse equipped with the 4G63 engine is a popular choice among car enthusiasts. Known for its potential to be modified, many seek to achieve high horsepower figures while retaining the reliability of OEM components. In this article, we will explore various modifications that can help achieve 400 horsepower while comparing them to stock components.
Understanding the 4G63 Engine
The 4G63 engine is a 2.0L inline-four engine that has gained a reputation for its robust performance and tunability. It was used in various Mitsubishi models, including the Eclipse, Talon, and Galant. The engine features a DOHC design and has a turbocharged variant, which is the focus of many modifications.
Stock vs. Modified: Key Components
When comparing stock components to modified ones, it is essential to focus on key areas that impact performance. Below are the major components that are often upgraded:
- Turbocharger
- Fuel System
- Exhaust System
- Engine Management
- Intercooler
Turbocharger Upgrades
The stock turbocharger on the 4G63 can limit power output significantly. Upgrading to a larger turbo, such as a GT3071 or a 20G, can drastically improve airflow and boost levels. This change is crucial for reaching the 400 hp goal.
Fuel System Enhancements
To support higher horsepower, the fuel system must be upgraded. This includes:
- Upgraded fuel injectors (e.g., 650cc or larger)
- High-flow fuel pump
- Adjustable fuel pressure regulator
Exhaust System Modifications
A free-flowing exhaust system is vital for reducing back pressure and improving turbo efficiency. Consider the following upgrades:
- 3-inch downpipe
- High-performance cat-back exhaust
- Test pipe or high-flow catalytic converter
Engine Management Tuning
Proper tuning is essential to maximize the potential of any modifications. Upgrading to a standalone engine management system or a piggyback system allows for better control over fuel maps and ignition timing.
Upgrading the Intercooler
To support higher boost levels, an upgraded intercooler is recommended. A larger front-mount intercooler can significantly reduce intake temperatures, improving overall performance and reliability.
Reinforced OEM Components
While aftermarket parts are essential, reinforcing OEM components can enhance reliability. Key areas to focus on include:
- OEM pistons and rods
- Upgraded head gasket
- ARP head studs
Conclusion
Achieving 400 horsepower from a 4G63 Eclipse is possible with the right combination of modifications and reinforced OEM components. By upgrading the turbocharger, fuel system, exhaust, engine management, and intercooler, enthusiasts can unlock the engine’s full potential while maintaining reliability.