The Nissan GT-R R35 is an engineering marvel, but unlocking its full potential requires a precise fuel delivery system. Stock fuel injectors become a bottleneck when targeting gains of 300 horsepower or more, especially with aggressive boost levels, E85 ethanol blends, or upgraded turbochargers. Choosing the right injectors is a critical decision that affects idle quality, atomization, and overall engine reliability. Below we break down the top five injector upgrades that can safely support 300+ hp increases, along with the supporting hardware and tuning considerations you need for a successful build.

Why Fuel Injector Upgrades Are Critical for 300+ HP Gains

The R35’s factory injectors are designed for the stock 480-530 hp output. As you push toward 800+ wheel horsepower, the fuel system must deliver significantly more volume without sacrificing spray pattern or linearity. Insufficient injector flow leads to lean air-fuel ratios, which can cause detonation and catastrophic engine failure. High-flow injectors also allow tuners to command shorter pulse widths at high load, improving response and reducing the risk of fuel dilution in the oil. For builds targeting 300+ additional horsepower, injectors in the 1000-1300cc/min range are the sweet spot, with some larger options available for extreme setups.

Top 5 Fuel Injector Upgrades

1. DeatschWerks DW300c (1000cc/min)

The DeatschWerks DW300c injectors have earned a loyal following among GT-R owners who want a direct-fit upgrade without modifying the fuel rail or harness. These injectors flow 1000cc/min at 43.5 psi base pressure and are fully compatible with E85, pump gas, and methanol blends. The DW300c uses a high-impedance design that works plug-and-play with the factory ECU after a simple scaling adjustment in the tune.

Atomization quality is excellent thanks to a four-hole disc injector nozzle, which helps maintain consistent air-fuel mixing even at high boost. Many tuners report that the DW300c set can support up to 850 wheel horsepower on E85 with sufficient fuel pump and line upgrades. DeatschWerks provides detailed flow data and matched sets for balanced performance across all six cylinders.

  • Flow rate: 1000cc/min at 43.5 psi
  • Fuel compatibility: E85, gasoline, methanol blends
  • Installation: Direct fit; includes adapters for OEM connectors
  • Impedance: High impedance (no resistor box needed)
  • Support level: Up to ~850 whp on E85

2. Injector Dynamics ID1300X (1300cc/min)

Injector Dynamics is the gold standard in high-performance fuel injection. The ID1300X injectors flow 1300cc/min and are designed for exceptional linearity across the entire operating range. This means the tuner can precisely control fueling from idle to full throttle without the non-linearities that plague lesser injectors. The ID1300X features a stainless steel construction and a proprietary diffuser plate that creates a stable, highly atomized spray pattern.

These injectors shine in high-boost, high-rpm applications common in big-turbo GT-R builds. They also handle E85 and race fuels without issues. The injectors are high-impedance and include adapters to fit the R35’s fuel rail. Because of their robust flow margin, the ID1300X is often the choice for owners targeting 900 whp or more. Injector Dynamics offers a comprehensive data file that simplifies tuning integration with popular ECUs like the Cobb Accessport or Syvecs.

  • Flow rate: 1300cc/min at 43.5 psi
  • Fuel compatibility: E85, pump gas, C16, methanol
  • Installation: Includes adapters; may require slight fuel rail modification on some early models
  • Linearity: Exceptional; tuned data file provided
  • Support level: 900+ whp on E85

3. Bosch EV14 1000cc (Motorsport Variant)

The Bosch EV14 1000cc injectors are an OEM-plus upgrade used extensively in professional motorsports. The EV14 series is known for its reliable operation, consistent flow, and resistance to clogging when running ethanol blends. Bosch uses a high-quality solenoid and valve design that delivers fast response times, which translates to precise fuel metering at high RPM and boost levels.

In the GT-R community, the Bosch EV14 1000cc is a popular budget-friendly alternative to more expensive brands, yet it doesn’t compromise on quality. These injectors are available as plug-and-play kits with proper adapters for the R35. They work well with pump gas and E85, supporting about 800-850 whp when paired with a suitable fuel system. Because of their widespread use, many tuners have experience calibrating them, reducing tuning time. Bosch Motorsport provides technical documentation for flow curves.

  • Flow rate: 1000cc/min at 43.5 psi
  • Fuel compatibility: Gasoline, E85, methanol
  • Installation: Requires adapters; direct fit in modified rail
  • Reliability: Proven in endurance racing
  • Support level: Up to ~800 whp on E85

4. Fuel Injector Clinic (FIC) 1200cc

Fuel Injector Clinic offers a 1200cc injector specifically engineered for high-boost forced induction applications. The FIC 1200cc uses a multi-disc diffuser plate that promotes fine atomization, essential for preventing knock on high-ethanol blends. The injectors are matched into sets within 1% flow tolerance, ensuring cylinder-to-cylinder consistency that is vital for smooth idle and maximum power.

These injectors are high-impedance and include a plug-and-play adapter harness for the R35. They support a wide range of fuels, including E85, C16, and even full methanol injection setups. On a properly supported GT-R, the FIC 1200cc can handle up to 900 whp. Tuners appreciate the linear response and the detailed data sheet provided by FIC. For owners who want peace of mind, the company offers a limited lifetime warranty on the injectors. Fuel Injector Clinic is a trusted source for high-quality injectors in the import performance world.

  • Flow rate: 1200cc/min at 43.5 psi
  • Fuel compatibility: E85, race gas, methanol
  • Installation: Plug-and-play with included adapters
  • Flow matching: Within 1% across all injectors
  • Support level: Up to 900 whp

5. Nismo 600cc (Direct OEM Upgrade)

The Nismo 600cc injectors are a mild upgrade over the stock injectors, offering a 50% flow increase. They are a direct OEM replacement and require no modifications to the fuel rail, harness, or ECU scaling beyond a simple injector flow compensation. While they won’t support 300+ hp gains alone, they are often used as part of a Stage 2 or Stage 3 Nismo upgrade package that includes turbos and intercoolers.

For owners who plan to stay in the 700-750 whp range and prefer a factory-grade solution, the Nismo injectors are a solid choice. They are designed for pump gas but can handle E85 with proper supporting fuel system modifications. Nismo injectors come with the same reliability as OEM parts, and they are frequently used by owners who want a straightforward, low-hassle upgrade. Nismo offers complete performance packages that include these injectors.

  • Flow rate: 600cc/min at 43.5 psi
  • Fuel compatibility: Pump gasoline (E85 with supporting mods)
  • Installation: Direct OEM fit; no adapters needed
  • Reliability: Factory-grade durability
  • Support level: ~200-250 hp gain in Nismo package context

Supporting Modifications for 300+ HP Gains

Injectors alone cannot deliver 300+ extra horsepower. You must upgrade the entire fuel delivery system to maintain proper pressure and volume. Here are the critical supporting modifications:

High-Flow Fuel Pump

The factory fuel pump maxes out around 550-600 whp. For 300+ hp gains, you need a dual-pump or brushless pump setup. Options include the DeatschWerks DW400 or the Torqbyte PMU for brushless control. Ensure the pump can supply enough volume at the target boost pressure, especially if using E85 which requires approximately 30% more flow.

Fuel Pressure Regulator and Lines

A fuel pressure regulator (e.g., Radium, AEM) allows you to maintain a consistent base pressure. Upgraded fuel lines (e.g., -8AN feed, -6AN return) reduce restriction. Many high-horsepower GT-Rs use a return-style fuel system to keep pressure stable under high demand.

ECU Tuning

After installing larger injectors, a professional tune is mandatory. The ECU must be recalibrated for the new injector scaling and voltage offsets. Popular platforms include Cobb Accessport, EcuTek, or standalone systems like Syvecs or MoTeC. Without proper tuning, you risk drivability issues and engine damage.

Intercooler and Turbo Upgrades

To truly achieve 300+ hp gains, you will likely need upgraded turbos (e.g., GT28RS, GTX3582R, or larger) and a high-flow intercooler. The stock turbos are capable of about 600 whp. Larger injectors support these turbos by providing the necessary fuel flow.

Installation Considerations

Fuel injector replacement on the R35 is a moderate DIY job for experienced mechanics, but professional installation is recommended if you lack experience with high-pressure fuel systems. Key steps include:

  • Relieving fuel pressure and disconnecting the battery.
  • Removing the intake manifold to access the fuel rail (requires gasket replacement).
  • Carefully swapping injectors and using new o-rings and seals.
  • Reinstalling the fuel rail and torqueing bolts to spec to avoid fuel leaks.
  • Performing a leak test before starting the engine.

Improper installation can cause fuel leaks, which are fire hazards. Always check injector flow data and ensure the ECU calibration matches the new hardware.

Conclusion

Selecting the right fuel injectors is one of the most impactful decisions for a Nissan GT-R R35 build targeting 300+ horsepower gains. The DeatschWerks DW300c and Bosch EV14 1000cc offer excellent value and proven performance for 800-850 whp goals, while the Injector Dynamics ID1300X and FIC 1200cc provide the headroom and linearity necessary for 900+ whp setups. The Nismo 600cc remains a solid choice for factory-based stage upgrades. Whichever injectors you choose, pair them with a comprehensive fuel system upgrade and professional tuning to ensure reliability and full power potential. Consult with a reputable GT-R specialist to match injector flow to your specific turbos and fuel choice.