Ameer Randolph
The Nissan VQ Engine is renowned for its performance, boasting 280 horsepower at 6,200 rpm and 270 pound-feet of torque at 4,800 rpm. With a focus on power and efficiency, the VQ Engine has become a popular choice for drivers seeking performance and practicality. The engine's potential for aftermarket upgrades has made it a favourite among enthusiasts, who can further enhance its output for track use. Upgrades to the fuel injectors, in particular, can improve the engine's performance and fuel efficiency. For instance, Z1 Kinetic Fuel Injectors by Nostrum are a drop-in replacement injector for the VQ35 engine, found in the Nissan 350Z and Infiniti G35, which can support power levels in excess of 800whp.
| Characteristics | Values |
|---|---|
| Engine type | VQ series engine |
| Horsepower | 280 horsepower at 6,200 rpm |
| Torque | 270 pound-feet of torque at 4,800 rpm |
| Fuel injector options | Z1 Kinetic Fuel Injectors by Nostrum, AUS Injection GTR plug & play fuel injectors, Z1 350Z/G35 1000cc Drop-In Fuel Injectors, Z1 370Z/G37 1000cc Drop-In Fuel Injectors |
| Fuel pump and injector recommendations | For E85 with VQ35DE or VQ37VHR platform: 255lph fuel pump and 650cc injectors; For Stage II nitrous or boosted builds up to 800whp: 340lph fuel pump with 1000cc injectors; For extreme builds over 800whp: 340lph fuel pump and 2200cc injectors |
| Fuel flow considerations | Fuel ethanol content, boost levels, turbo/supercharger size, air:fuel ratio, and fuel pressure |
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What You'll Learn
Injector spray patterns
There are several types of injector spray patterns, each designed for a specific type of system. The two-hole spray pattern, for example, directs the spray to either the back of a single intake valve or the back of a two-intake valve system. Some two-hole spray patterns create a "V" shape, which can be narrow or wide, and can be clocked at various angles. Other two-hole spray patterns have a bent spray that does not spray straight down.
The number of holes in the injector nozzle plate can vary, with some injectors having as few as four holes and others having up to 18 holes. The Green Denso injectors in the newer VQ35HR and HR-styled 09+ VQ35DE engines, for example, have a 12-hole spray pattern. This is the same number of holes as the Blue Denso injectors, but the Green Denso injectors have smaller holes, resulting in a slightly higher flow rate and better atomization.
When choosing an injector spray pattern, it is important to consider the specific requirements of your engine. Simply changing from one type of spray pattern to another may not necessarily improve performance. For example, installing a wide "V"-pattern injector that misses the intake valves may result in poorer performance compared to the stock injector.
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Fuel flow
Upgrading the fuel injectors is one way to enhance the VQ engine's performance. The fuel injectors play a crucial role in delivering the precise amount of fuel to the engine, ensuring optimal combustion and power output. When considering an upgrade, it's essential to prioritize proper fuel flow and choose injectors that are specifically designed for the VQ engine.
One option for fuel injector upgrades is the Z1 Kinetic Fuel Injectors by Nostrum. These injectors are designed as a drop-in replacement for the VQ35 and VQ37 engines found in Nissan and Infiniti vehicles. The patented nozzle design allows multiple jets of fuel to intersect, utilizing kinetic energy to achieve superior atomization. This results in shorter liquid lengths and prevents film accumulation on cylinder walls and pistons. With power levels exceeding 800whp, these injectors offer impressive performance capabilities.
Another option for fuel injector upgrades is the Replacement EAC 650cc Fuel Injectors, which are plug-and-play for the VQ engine. These injectors are direct replacements for the stock fuel injectors, offering a straightforward upgrade path. Additionally, the Z1 350Z / G35 1000cc Drop-In VQ Fuel Injectors are specifically engineered for the VQ series engine and are capable of supporting power levels above 700whp.
It's important to note that the required fuel flow rate depends on various factors, including fuel ethanol content, boost levels, supercharger or turbocharger size, air-to-fuel ratio, and fuel pressure. When upgrading fuel injectors, it is recommended to consider a return-style fuel system for optimal performance. Furthermore, ECU tuning, forced induction, aftermarket performance parts, and upgraded engine management systems can also enhance the VQ engine's overall performance and fuel efficiency.
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Return-style fuel system
The Nissan VQ engine is a family of V6 automobile petrol engines developed to replace the VG series. The VQ engine has been improved over the years, with advancements in power output and efficiency. The VQ35DE, for example, has been enhanced with variable exhaust timing, a higher rev limit, and a revised oil pump, resulting in increased output. The VQ35HR, a higher-power variant, addresses crankshaft issues and incorporates friction reduction techniques.
Upgrading to a return-style fuel system can further enhance the performance of the VQ engine. This type of fuel system is designed to maximize the effectiveness of the fuel pump and injectors, resulting in improved fuel flow and engine performance. The return-style fuel system achieves this by utilizing a "'return correction' modification kit, which enables the fuel pump to recover fuel from the left-hand side of the tank. This modification is essential for converting the fuel system to a return-style configuration while retaining the factory in-tank venturi system.
The benefits of a return-style fuel system are particularly notable in forced induction applications. For example, the Z1 Kinetic Fuel Injectors by Nostrum, designed for the VQ35 and VQ37 engines, can support power levels exceeding 800whp when paired with a return-style fuel system. This is achieved through superior atomization of the fuel, which is accomplished by allowing multiple jets of fuel to collide and utilizing kinetic energy. This results in shorter liquid lengths and prevents film accumulation on cylinder walls and pistons.
When considering an upgrade to a return-style fuel system, it is important to ensure compatibility with the specific VQ engine variant. For example, the Radium Fuel Rail Kit is compatible with the VQ35DE, VQ35HR, and VQ37VHR engines, while also offering flexibility in plumbing configurations, including a return system. Additionally, it is recommended to refer to the detailed specifications of the fuel injectors, as factors such as fuel ethanol content, boost levels, and fuel pressure can influence the required flow rate and overall performance.
In summary, upgrading to a return-style fuel system can significantly enhance the performance of the VQ engine by maximizing fuel pump efficiency and improving fuel flow. This modification is particularly beneficial for forced induction applications, as demonstrated by the power levels achieved by the Z1 Kinetic Fuel Injectors in conjunction with a return-style fuel system. When upgrading, it is crucial to consider the specific VQ engine variant and consult with experts to ensure compatibility and optimal performance.
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Injector nozzle design
The fuel injector nozzle is an important component of the fuel delivery system, and its design plays a critical role in the overall performance of the engine. The nozzle's design directly influences the spray pattern, droplet size, and flow rate of the fuel, all of which impact combustion efficiency, power output, and emissions.
When it comes to the VQ engine, Nissan's renowned powerplant, the injector nozzle design becomes even more crucial. The VQ engine, known for its impressive performance and balance between power and efficiency, has a strong following among enthusiasts due to its potential for aftermarket upgrades. Upgrading the fuel injectors can unlock even greater performance, but it's important to understand the intricacies of injector nozzle design to make an informed decision.
The Z1 Kinetic Fuel Injectors by Nostrum, designed as a drop-in replacement for the VQ35 and VQ37 engines, showcase innovative nozzle technology. Their patented nozzle design enables multiple jets of fuel to collide, harnessing kinetic energy to achieve superior atomization. This collision of fuel jets results in shorter liquid lengths, preventing the accumulation of fuel film on cylinder walls and piston surfaces. This optimized atomization enhances combustion by creating a more uniform mixture of fuel and air, leading to a cleaner burn and improved engine performance.
Additionally, the spray pattern of the injector nozzle has been meticulously engineered using advanced CFD (Computational Fluid Dynamics) technology. By analyzing the intake manifold design, piston profile, and cylinder head geometry, the spray pattern is optimized for the VQ engine's combustion chamber. This ensures that the fuel is precisely directed to the intake valves, promoting a more efficient and complete burn, which translates to better cold starts, smoother idle quality, and enhanced mid-range performance.
When considering an upgrade for the VQ engine, it's important to prioritize injector nozzles that offer superior atomization, precise spray patterns, and compatibility with the engine's fuel flow requirements. The right injector nozzle design can unlock the full potential of the VQ engine, maximizing power output while maintaining the efficiency and reliability that Nissan's VQ engine is renowned for.
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Power output
The Nissan VQ engine is known for its power and efficiency, with 280 horsepower at 6,200 rpm and 270 pound-feet of torque at 4,800 rpm. The engine has a reputation for reliability and is a popular choice for drivers seeking a blend of performance and practicality. Upgrading the fuel injectors can further enhance the power output of the VQ engine.
Upgrading to high-performance fuel injectors can increase the power output of the VQ engine by delivering more fuel to the engine. The additional fuel can be combusted, resulting in increased horsepower. The specific horsepower increase will depend on the size and power output of the engine, with larger engines typically requiring a more substantial percentage increase to achieve the same horsepower gain as a smaller engine. For example, a 1.8L engine with 220 horsepower might see a 10-20% increase, while a 3.0L engine with 300 horsepower would need a larger percentage increase to achieve the same gain.
It is important to note that simply installing larger fuel injectors will not automatically increase power. Other modifications, such as upgrading the fuel pump, increasing the size of the fuel lines, and installing a bigger throttle body, are necessary to ensure the engine can handle the additional fuel and avoid potential problems. Additionally, the air-to-fuel ratio must be maintained for optimal performance, as too much or too little fuel can hinder the engine's power output.
The Z1 370Z / G37 1000cc Drop-In VQ Fuel Injectors are a popular choice for the VQ engine, capable of supporting power levels exceeding 700whp. These injectors are engineered to provide proper fuel flow and utilize kinetic energy to produce superior atomization, resulting in a cleaner burn and improved cold starts, idle quality, and mid-range performance. Another option is the Nostrum Kinetic Fuel Injectors, which are designed for the VQ37 engine and can support power levels above 800whp with a return-style fuel system.
To maximize the power output of the VQ engine, it is recommended to consider additional upgrades such as superchargers or turbochargers, aftermarket performance parts (cams, headers, fuel system enhancements), and upgraded engine management systems for more precise control over tuning parameters. Dyno tuning sessions can also help fine-tune the power delivery and torque curve to achieve optimal performance.
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Frequently asked questions
Fuel injectors deliver fuel to the engine using a fuel pressure regulator. Performance injectors can help your engine perform at maximum capacity and boost fuel economy by delivering more fuel to the combustion chamber.
Z1 Kinetic Fuel Injectors by Nostrum are a drop-in replacement injector for the VQ35 engine found in the Nissan 350Z and Infiniti G35. They are engineered to provide your engine with proper fuel flow and can support power levels in excess of 800whp with a return-style fuel system.
You should know how much NOS you want to add to your car before purchasing performance fuel injectors. You can use a fuel injector calculator to help you figure out the exact fuel injectors you need for your vehicle. You will also need to match your fuel injector to the type of fuel your car uses.
You will need to reprogram the ECU (engine control unit) so that it operates according to your new specifications rather than stock specifications. You may also need to upgrade your fuel pump and add an adjustable fuel pressure regulator.
