The Nissan 370Z Nismo is a remarkable sports car known for its performance and agility. However, for enthusiasts looking to enhance its power output, upgrading the fuel injectors can be a game changer. In this article, we will explore the best fuel injector upgrades for the Nissan 370Z Nismo, aiming to boost power from 350 to 400 horsepower. We’ll cover how injectors work, why they matter for your build, the top injector options available, supporting modifications, installation tips, and tuning essentials.

How Fuel Injectors Work and Why They Limit Power

Fuel injectors are electro-mechanical valves that meter and atomize fuel into the engine’s intake ports or combustion chambers. The stock injectors on the Nissan 370Z Nismo (typically 380cc or 440cc depending on year) are designed to support the factory 350 hp output. As you increase boost, add a larger throttle body, or install a free-flowing exhaust, the engine demands more fuel. When injectors reach their maximum duty cycle (usually around 80% to 90% for safety), fuel delivery becomes insufficient, leading to lean air-fuel ratios, detonation, and potential engine damage. Upgrading to higher-flow injectors ensures that the fuel system can keep up with increased airflow, allowing for a safe and significant horsepower gain.

Benefits of Upgrading Fuel Injectors

Upgrading the fuel injectors in your Nissan 370Z Nismo provides several key benefits:

  • Increased Fuel Flow Capacity: Higher flow injectors (measured in cc/min or lb/hr) deliver more fuel per unit time, directly supporting higher horsepower goals.
  • Enhanced Atomization: Modern aftermarket injectors often feature multi-hole designs that improve fuel atomization, leading to more complete combustion, better throttle response, and reduced emissions.
  • Greater Tuning Headroom: With larger injectors, your tuner has the flexibility to dial in the perfect air-fuel ratio across the entire RPM range, optimizing both power and reliability.
  • Consistency at High RPM: Stock injectors can become inconsistent when pushed near their limits. Upgraded injectors maintain stable flow at higher duty cycles, ensuring predictable performance during track sessions or aggressive driving.

Stock vs. Upgraded Injectors: What’s the Difference?

The stock Nissan 370Z Nismo injectors (part number 16600-JA00A or similar) are rated around 440cc/min. While adequate for the factory tune, they quickly become a bottleneck when aiming for 400+ hp. In contrast, common aftermarket upgrades like 600cc, 750cc, or 1000cc injectors provide ample headroom. For example, a 600cc injector can support approximately 400 hp on a naturally aspirated VQ37VHR engine when combined with other bolt-on mods, while a 1050cc injector can handle 500+ hp for forced induction builds. The key is matching injector size to your overall power target and fuel system capability.

Top Fuel Injector Upgrades for Nissan 370Z Nismo

Below are the most recommended injectors for reaching 350 to 400 hp reliably. Each option is tested, supported by the tuning community, and available through reputable retailers.

1. DeatschWerks 600cc Injectors (DW600)

The DeatschWerks 600cc injectors are a direct plug-and-play upgrade for the 370Z. They offer a 50% increase in flow over stock, making them ideal for naturally aspirated builds targeting 400 hp. DW injectors are flow-matched to within 1% and include new seals and spacers. They operate with the factory fuel rail and harness, simplifying installation. Many owners report solid idle quality and linear power delivery after a proper tune.

2. Injector Dynamics ID1050X

For those planning future forced induction or ethanol fuel, the Injector Dynamics ID1050X is a top-tier choice. These 1050cc injectors feature a unique “power pulse” design that improves transient response and spray pattern. They are compatible with E85 and can support over 500 hp. ID injectors are known for their exceptional low-speed drivability and precise fueling control. They require some modification to the fuel rail or adapter harness, but the performance gains are worth it.

3. Siemens Deka 60 lb/hr (630cc) Injectors

The Siemens Deka 60 lb/hr injectors (equivalent to ~630cc) are a budget-friendly option that still delivers excellent performance. They are widely used in LS swaps and have been adapted to the VQ platform with proper connectors. These injectors are drop-in compatible with many 370Z fuel rails and work well with standard tuning solutions like UpRev or ECUTek. They are a solid choice for the 350–400 hp range when paired with a matching fuel pump.

4. RC Engineering 1000cc Injectors

For extreme builds, RC Engineering offers 1000cc injectors that can support well over 500 hp. Although overkill for a 400 hp goal, they provide maximum headroom for future upgrades. RC injectors are flow-matched and come with detailed calibration data. Be aware that 1000cc injectors can cause idle tuning challenges on a naturally aspirated engine, so they are best reserved for supercharged or turbocharged setups.

Supporting Modifications for Fuel Injector Upgrades

Installing larger injectors alone will not unlock full power. The following modifications are strongly recommended or required to safely achieve 400 hp:

  • High-Flow Fuel Pump: A larger fuel pump (e.g., Walbro 255 lph or DeatschWerks DW300) ensures adequate fuel pressure and volume at the rail. Without it, injectors may starve under heavy load.
  • Fuel Pressure Regulator: An adjustable regulator or upgraded factory regulator may be needed to maintain proper pressure, especially with high-flow pumps.
  • Cold Air Intake and Exhaust: To reach 400 hp, the engine needs to breathe freely. A true cold air intake (e.g., Stillen, Z1) and a full exhaust system (headers, test pipes, cat-back) are essential.
  • ECU Tuning: This is non-negotiable. Whether via UpRev, ECUTek, or a standalone ECU, a professional tune is required to calibrate injector flow rates, fuel maps, ignition timing, and throttle response. Self-tuned via a universal piggyback is not recommended.
  • Ethanol Sensing (Optional): If running E85, a flex fuel sensor and corresponding injector scaling will be necessary.

Installation Considerations and Tips

While some enthusiasts install injectors themselves, attention to detail is critical. Follow these guidelines:

  • Use New Seals and O-Rings: Always replace seal kits when swapping injectors. Old rubber can harden and leak, causing vacuum leaks or fire hazards.
  • Clean the Fuel Rail: Remove and flush the fuel rail to remove any debris. Particles can clog new injectors.
  • Check Injector Height: Some aftermarket injectors have different body heights. You may need spacers or modified bolts to ensure proper fitment.
  • Professional Installation Recommended: If you are not experienced with fuel system work, have a professional shop handle the swap. Improperly seated injectors can cause dangerous fuel leaks.
  • Test for Leaks: After installation, pressurize the system and check for leaks before starting the engine.

Expected Performance Gains and Dyno Results

With 600cc injectors, a performance tune, a cold air intake, and a full exhaust, a 370Z Nismo can achieve approximately 360–400 wheel horsepower (depending on dyno and drivetrain loss). Stock 350 crank hp usually translates to about 280–300 whp. A properly tuned 400 hp crank target often yields 320–340 whp. (Note: Horsepower numbers are approximate; actual results vary.) Many owners report gains of 40–70 whp over stock after a comprehensive bolt-on and injector upgrade.

Cost and Parts List Summary

Here is a rough parts budget for a 400 hp aspirated build:

  • Fuel injectors (DW600): ~$450–550
  • Fuel pump upgrade: $150–250
  • Professional tune (UpRev/ECUTek): $500–800
  • Cold air intake: $350–600
  • Full exhaust system: $1,000–1,800
  • Total approximate: $2,500–$4,000 (labor extra)

Forced induction builds raise the cost significantly but deliver much higher peak power.

External Resources and Further Reading

To dive deeper into injector specifications and real-world experiences, check out these trusted sources:

Conclusion

Upgrading the fuel injectors in your Nissan 370Z Nismo is a pivotal step toward achieving a reliable 400 hp. By selecting the correct injector size—such as DeatschWerks 600cc for a naturally aspirated build or ID1050X for future forced induction—and supporting the upgrade with a proper fuel pump, intake, exhaust, and professional tuning, you can transform your Nismo into a more potent and responsive machine. Always plan your modifications in a logical order, and invest in quality parts and tuning to protect your engine. With the right setup, your 370Z Nismo will reward you with an exhilarating driving experience that meets—and exceeds—your performance goals.