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The RX-7 has long been celebrated for its lightweight design and agile handling, making it a favorite among car enthusiasts. However, when it comes to performance upgrades, particularly with an LS swap, the fuel system plays a crucial role in ensuring that the engine runs efficiently and effectively. In this article, we will explore the importance of fuel system upgrades when aiming for a 600 horsepower output in an RX-7 LS swap.
Understanding the Basics of Fuel Systems
The fuel system in any vehicle is responsible for delivering the right amount of fuel to the engine for combustion. In a high-performance application like a 600 HP RX-7 LS swap, the stock fuel system is often inadequate. Upgrading the fuel system involves several key components:
- Fuel Pump
- Fuel Injectors
- Fuel Lines
- Fuel Pressure Regulator
- Fuel Filter
Fuel Pump Upgrades
The fuel pump is the heart of the fuel system. For a 600 HP LS engine, a high-flow fuel pump is essential. Stock pumps typically cannot provide the necessary volume and pressure. Consider the following options:
- In-Tank Fuel Pumps: These are quieter and often easier to install.
- External Fuel Pumps: These can provide higher flow rates but may require more complex plumbing.
Choosing the Right Fuel Pump
When selecting a fuel pump, consider the horsepower goals and the type of fuel being used. For E85 or high-octane gasoline, a pump rated for at least 255 LPH (liters per hour) is recommended. Brands like Aeromotive and Walbro offer reliable options for high-performance applications.
Fuel Injector Considerations
Fuel injectors are responsible for atomizing fuel and delivering it to the combustion chamber. For a 600 HP setup, larger injectors are necessary to ensure adequate fuel delivery. Stock injectors typically range from 550cc to 750cc, while high-performance setups may require:
- 1000cc Injectors: Suitable for moderate boost applications.
- 1200cc or Higher: Ideal for high boost and high horsepower applications.
Injector Sizing and Compatibility
When choosing injectors, it’s important to match them with the engine management system. Ensure that the injectors can handle the fuel pressure and flow requirements of the LS engine. Brands like Bosch and Injector Dynamics are popular choices among performance enthusiasts.
Upgrading Fuel Lines
In a high-performance fuel system, the diameter and material of the fuel lines are critical. Upgrading from stock lines to larger diameter lines can help reduce fuel pressure drops and ensure that the engine receives a consistent fuel supply. Consider the following:
- Material: Use stainless steel or AN (Army-Navy) fittings for durability.
- Diameter: 6AN or larger is often recommended for high horsepower applications.
Fuel Pressure Regulators
A fuel pressure regulator maintains the correct fuel pressure for the injectors. In a boosted application, a rising rate regulator may be necessary. This ensures that as boost increases, fuel pressure also rises to maintain the correct air-fuel ratio. Consider these key points:
- Adjustability: An adjustable regulator allows for fine-tuning of fuel pressure.
- Return vs. Returnless: Choose based on your fuel system design.
Fuel Filters
Keeping the fuel clean is essential for engine health. Upgrading to a high-flow fuel filter can prevent debris from clogging injectors and causing performance issues. Key considerations include:
- Micron Rating: A filter with a lower micron rating will catch more contaminants.
- Flow Rate: Ensure the filter can handle the flow requirements of your fuel pump.
Common Mistakes to Avoid
When upgrading the fuel system for a 600 HP RX-7 LS swap, there are several common mistakes to avoid:
- Underestimating Fuel Needs: Always calculate the fuel requirements based on horsepower and fuel type.
- Neglecting Fuel Quality: Use high-quality fuel and consider fuel additives for performance.
- Ignoring Compatibility: Ensure all components are compatible with each other and the engine management system.
Conclusion
Upgrading the fuel system is a vital step in supporting a 600 HP RX-7 LS swap. By investing in quality components and ensuring compatibility, you can maximize performance and reliability. Proper fuel delivery will not only enhance engine performance but also contribute to the longevity of the engine. With the right upgrades, your RX-7 can achieve incredible power and performance on the road or track.