Upgrading Fuel Systems for 700+ Hp 2jz Swap 240sx

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The Nissan 240SX has long been a favorite among car enthusiasts, especially when it comes to engine swaps. One of the most popular swaps is the Toyota 2JZ, known for its incredible power potential. However, achieving 700+ horsepower requires significant upgrades, particularly to the fuel system. This article will guide you through the essential components and considerations for upgrading the fuel system in your 2JZ-swapped 240SX.

Understanding Fuel Requirements

Before diving into specific upgrades, it’s crucial to understand the fuel requirements for a 700+ hp setup. The 2JZ engine, especially in its turbocharged form, demands a reliable and efficient fuel system to deliver the necessary fuel volume and pressure. Here are the primary factors to consider:

  • Fuel Flow Rate: The fuel system must be capable of delivering enough fuel to support 700+ hp, typically around 1,000 cc/min.
  • Fuel Pressure: Maintaining proper fuel pressure is essential for optimal performance and engine safety.
  • Fuel Quality: High-octane fuel is recommended to prevent knock and maximize performance.

Upgrading Fuel Pumps

The fuel pump is the heart of your fuel system. For a 700+ hp 2JZ setup, you’ll need a high-performance fuel pump that can supply sufficient fuel volume at the required pressure. Here are some popular options:

  • Walbro 450: A popular choice among tuners, this pump can support up to 700 hp with the right setup.
  • AEM 320: Known for its reliability and performance, this pump is rated for 320 liters per hour.
  • Radium Engineering Dual Pump System: For those looking for redundancy and extra capacity, this system allows for two pumps to work in tandem.

Choosing the Right Fuel Injectors

Fuel injectors play a critical role in delivering the right amount of fuel to the engine. For a 700+ hp build, you’ll need larger injectors to ensure adequate fuel flow. Consider the following options:

  • Injector Dynamics 1000cc: These injectors are widely used in high-performance applications and provide excellent flow and atomization.
  • DeatschWerks 1200cc: Another great option, these injectors are capable of supporting high horsepower while maintaining good driveability.
  • Siemens Deka 1600cc: For extreme builds, these injectors offer high flow rates and reliability.

Fuel Pressure Regulators

A fuel pressure regulator is essential for maintaining consistent fuel pressure, which is crucial for performance and safety. When upgrading your fuel system, consider the following:

  • Aeromotive Adjustable Regulator: This regulator allows you to fine-tune your fuel pressure, making it a versatile choice for tuners.
  • Fuel Lab Regulator: Known for its precision and durability, this regulator can handle high pressures and flows.
  • Holley EFI Regulator: A reliable option that offers good performance and ease of use.

Fuel Lines and Fittings

Upgrading your fuel lines and fittings is crucial to ensure that your fuel system can handle the increased flow and pressure. Consider using the following materials and sizes:

  • AN Lines: Using AN (Army-Navy) lines can provide a secure and leak-free connection, ideal for high-performance applications.
  • Size: Generally, 6AN lines are sufficient for most 700+ hp setups, but 8AN may be necessary for extreme builds.
  • Quality Fittings: Invest in high-quality fittings to prevent leaks and ensure reliability.

Fuel Tank Modifications

Depending on your specific setup, you may need to modify or replace the fuel tank to accommodate your upgraded fuel system. Here are some considerations:

  • Fuel Cell: Installing a fuel cell can provide increased capacity and better fuel delivery in performance situations.
  • Fuel Pump Access: Consider modifying the tank for easier access to the fuel pump for future maintenance.
  • Strainer Replacement: Ensure that the fuel strainer is adequate for your new pump to prevent clogging.

Conclusion

Upgrading the fuel system for a 700+ hp 2JZ swap in a Nissan 240SX is a critical step in achieving your performance goals. By carefully selecting the right components, from pumps to injectors, and ensuring proper installation, you can create a reliable and efficient fuel system that supports your high-performance aspirations. Remember to always consult with a professional tuner to optimize your setup for the best results.