Datsun 240z Fuel Injection Conversion: from Carbs to Efi for 30 Hp Gain

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The Datsun 240Z is a classic sports car that has captured the hearts of many enthusiasts. One of the most popular modifications for this vehicle is the conversion from carburetors to electronic fuel injection (EFI). This upgrade not only modernizes the fuel delivery system but can also result in a significant power increase. In this article, we will explore the benefits of converting to EFI, the steps involved in the conversion, and the potential performance gains.

Benefits of EFI Over Carburetors

Switching from carburetors to EFI offers several advantages that can enhance the performance and drivability of the Datsun 240Z.

  • Improved Fuel Efficiency: EFI systems provide more precise fuel delivery, which can lead to better fuel economy.
  • Increased Power: Many enthusiasts report gains of up to 30 horsepower after converting to EFI.
  • Better Throttle Response: EFI systems offer quicker and more responsive throttle input.
  • Cold Start Performance: EFI eliminates the need for choke adjustments, improving cold start reliability.
  • Reduced Emissions: EFI systems can help lower harmful emissions compared to carbureted setups.

Steps for EFI Conversion

Converting a Datsun 240Z from carburetors to EFI involves several key steps. Below, we outline the process to help guide you through the conversion.

  • 1. Choose an EFI System: There are various aftermarket EFI systems available. Popular options include MegaSquirt, Holley Sniper, and Datsun-specific kits.
  • 2. Gather Necessary Components: In addition to the EFI kit, you will need a fuel pump, fuel lines, injectors, an intake manifold, and an ECU.
  • 3. Remove Existing Carburetors: Carefully detach the carburetors and any associated components from the engine.
  • 4. Install the EFI Intake Manifold: Replace the carburetor manifold with the EFI manifold, ensuring a secure fit.
  • 5. Install Fuel System: Install the fuel pump and run new fuel lines from the tank to the engine bay.
  • 6. Install Injectors: Place the fuel injectors in the intake manifold according to the EFI system’s specifications.
  • 7. Connect the ECU: Wire the ECU and connect it to the injectors, fuel pump, and other sensors as required.
  • 8. Tune the System: Use a tuning tool or software to calibrate the EFI system for optimal performance.
  • 9. Test and Adjust: Start the engine and monitor for any issues, making adjustments as necessary.

Performance Gains and Expectations

Many Datsun 240Z owners experience notable performance improvements after completing the EFI conversion. The increase in horsepower can be attributed to several factors:

  • Better Air-Fuel Mixture: EFI systems optimize the air-fuel mixture based on real-time data, resulting in more efficient combustion.
  • Consistent Performance: Unlike carburetors, EFI maintains performance across a range of conditions, including temperature and altitude changes.
  • Higher RPM Capability: EFI systems can support higher RPM ranges, allowing for greater power output.

Conclusion

Converting the Datsun 240Z from carburetors to EFI is a worthwhile investment for those seeking improved performance and drivability. With benefits like increased horsepower, better fuel efficiency, and enhanced throttle response, this modification can breathe new life into a classic car. Whether you are a seasoned mechanic or a DIY enthusiast, the EFI conversion process can be a rewarding project that enhances your driving experience.