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The Mitsubishi Eclipse has long been a favorite among car enthusiasts, especially the first-generation models. Known for their lightweight design and turbocharged engines, these vehicles offer a great platform for tuning. In this article, we will explore how we achieved an impressive 280 horsepower from a 1G Eclipse while keeping the stock block intact.
Understanding the 1G Eclipse
The first-generation Eclipse, produced from 1990 to 1994, was built on the DSM platform. It featured a 2.0L inline-four engine, which was turbocharged in the GSX and GS models. This engine, known as the 4G63, is renowned for its tuning potential, making it a popular choice for performance enthusiasts.
Setting the Stage for Tuning
Before diving into the tuning process, we needed to ensure that our stock block was in excellent condition. This involved several key steps:
- Complete engine inspection
- Compression test to check cylinder health
- Replacement of worn gaskets and seals
- Upgrading the fuel system for better flow
Upgrading Components
To achieve our goal of 280 horsepower, we needed to upgrade several components while maintaining the stock block. Here’s what we focused on:
- Turbocharger: We replaced the factory turbo with a larger unit that could provide more airflow.
- Intercooler: An upgraded front-mount intercooler helped reduce intake temperatures.
- Exhaust System: A high-flow exhaust system improved turbo response and overall performance.
- Fuel Injectors: Upgraded injectors ensured we had enough fuel to support the increased horsepower.
Tuning the Engine
With the upgrades in place, it was time to tune the engine. We utilized a standalone engine management system to gain full control over the fuel and ignition maps. This allowed for precise adjustments that maximized performance. Key tuning considerations included:
- Air-fuel ratio optimization
- Boost control settings
- Ignition timing adjustments
- Monitoring engine parameters during test runs
Testing and Results
After completing the tuning process, we took the 1G Eclipse to the dyno for testing. We were thrilled to see the results:
- Peak Horsepower: 280 hp at 6,500 RPM
- Peak Torque: 300 lb-ft at 4,500 RPM
- Boost Pressure: 20 PSI
Conclusion
Achieving 280 horsepower from a stock block 1G Eclipse is no small feat, but with the right upgrades and tuning, it is possible. This project highlights the potential of the 4G63 engine and the satisfaction that comes from pushing the limits of a classic vehicle.
For enthusiasts looking to replicate this success, remember that careful planning and execution are key. With dedication and the right parts, your 1G Eclipse can also reach impressive performance levels while maintaining its stock block.