2020 Nissan 370z Nismo Engine

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2020 Nissan 370z Nismo Engine

Alright, let's dive deep into the heart of the 2020 Nissan 370Z Nismo: its engine. We're talking about the VQ37VHR, a powerplant that’s earned a reputation for its responsiveness, reliability, and modding potential. While fundamentally similar to the VQ37VHR found in other 370Z models and even some Infiniti applications, the Nismo variant receives specific tweaks to bump up performance, giving it that extra edge. This article is designed to give you, the experienced DIYer, a solid understanding of what makes this engine tick, what sets it apart, and what you need to know if you're planning any modifications.

VQ37VHR: The Foundation

The VQ37VHR is a 3.7-liter (3696cc) naturally aspirated V6 engine. The "VQ" designation refers to Nissan's VQ engine family, known for their smooth operation and relatively lightweight construction. Let's break down what the acronym "VHR" represents:

  • V: Indicates a V-type engine configuration.
  • Q: Denotes the VQ engine family.
  • 37: Represents the engine's displacement of 3.7 liters.
  • V: This is crucial; it signifies Variable Valve Event and Lift (VVEL).
  • H: Indicates high output.
  • R: Denotes a revised design, specifically referencing improved responsiveness and reduced friction compared to earlier VQ engines.

Key Features of the VQ37VHR:

Before we get into the Nismo-specific enhancements, let's cover the core technologies that define the VQ37VHR:

  • Aluminum Alloy Block and Heads: This construction minimizes weight, contributing to improved handling and fuel efficiency.
  • Forged Steel Crankshaft: Forged crankshafts are stronger and more durable than cast crankshafts, capable of handling higher engine speeds and power outputs. They're crucial for the engine's longevity and ability to withstand modifications.
  • Aluminum Alloy Pistons: Lightweight pistons help reduce reciprocating mass, allowing the engine to rev more freely.
  • Variable Valve Event and Lift (VVEL): This is perhaps the most significant technology in the VQ37VHR. VVEL allows for continuous adjustment of valve lift and duration on the intake valves. Unlike traditional variable valve timing (VVT) systems that only adjust valve timing, VVEL also controls how far the valves open, optimizing airflow for different engine speeds and loads. This results in improved fuel economy, reduced emissions, and enhanced performance across the rev range. Think of it as having an infinitely variable camshaft.
  • Continuously Variable Valve Timing Control System (CVTCS): While VVEL handles intake valve lift and duration, CVTCS independently controls the timing of both intake and exhaust valves. This dual system provides even greater control over valve timing, further optimizing performance and efficiency.
  • Iridium-Tipped Spark Plugs: These plugs offer increased durability and improved ignition performance compared to traditional spark plugs.
  • Equal Length Exhaust Manifolds: Designed to ensure exhaust gases from each cylinder travel the same distance before converging, promoting smoother exhaust flow and improved power output.

Nismo-Specific Enhancements

The 2020 Nissan 370Z Nismo's VQ37VHR isn't just a standard VQ37VHR. It receives specific upgrades to extract even more power. These include:

ECU Tuning

The most significant difference lies in the ECU (Engine Control Unit) tuning. Nismo engineers recalibrate the ECU to optimize fuel delivery, ignition timing, and VVEL/CVTCS settings. This aggressive tuning is what unlocks the additional horsepower and torque. It is also responsible for the enhanced throttle response, making the car feel more eager and connected to the driver. Expect a more aggressive fuel map and a higher rev limit compared to the base 370Z.

H-Pipe Exhaust System

The Nismo features a unique H-pipe exhaust system, which replaces the standard Y-pipe found in the base 370Z. An H-pipe connects the two exhaust banks, allowing exhaust pulses to equalize. This reduces backpressure and improves exhaust scavenging, resulting in a slight power increase and a throatier exhaust note. The H-pipe design helps to balance the exhaust flow between the two cylinder banks, minimizing turbulence and promoting a smoother flow of exhaust gases. This smoother flow is key to improving the engine's breathing and overall efficiency.

Important Note: While the H-pipe contributes to the overall performance gains, it's often the first modification many owners consider upgrading. Aftermarket exhaust systems, especially those with larger diameter piping and improved resonator designs, can yield further performance improvements.

Exhaust Manifold Design

While the fundamental design remains similar, the exhaust manifolds in the Nismo variant might receive subtle tweaks to optimize exhaust flow. These could involve minor adjustments to the internal diameter or runner length. Information on this is limited and the change is not significant.

Performance Figures

The Nismo tweaks result in a peak output of 350 horsepower at 7,400 rpm and 276 lb-ft of torque at 5,200 rpm. While these figures represent a modest increase over the standard 370Z (332 hp and 270 lb-ft), the Nismo's power delivery feels more immediate and responsive, especially in the mid-range.

Maintenance and Reliability

The VQ37VHR is generally considered a reliable engine, but like any high-performance engine, it requires proper maintenance. Here are a few key considerations:

  • Oil Changes: Regular oil changes with high-quality synthetic oil are crucial. Follow Nissan's recommended oil change intervals, or even shorten them if you frequently drive the car hard. The VQ37VHR is sensitive to oil quality, and using a high-performance synthetic oil will help protect the engine's internal components.
  • Coolant Flush: Regularly flush the cooling system to prevent corrosion and ensure proper cooling. Overheating can be catastrophic, especially in a high-performance engine like the VQ37VHR.
  • Spark Plugs: Replace spark plugs according to the manufacturer's recommendations. Worn spark plugs can lead to misfires and reduced performance.
  • Air Filter: A clean air filter is essential for optimal engine performance. Replace the air filter regularly to ensure unrestricted airflow.
  • Monitor Oil Consumption: The VQ37VHR, particularly in older models, has been known to exhibit some oil consumption. Regularly check the oil level and top it off as needed. Excessive oil consumption can be a sign of underlying issues, such as worn piston rings or valve seals.
  • Check for Leaks: Regularly inspect the engine for any signs of oil or coolant leaks. Addressing leaks promptly can prevent more serious problems down the road.

Modifications and Upgrades

The VQ37VHR is a popular platform for modifications. Here are some common upgrades and considerations:

  • Intake Systems: Aftermarket intake systems can improve airflow and potentially increase horsepower. However, be sure to choose a reputable brand and consider the potential for increased noise levels. A cold air intake (CAI) relocates the air filter to a cooler location, potentially improving performance.
  • Exhaust Systems: Upgrading the exhaust system can further reduce backpressure and improve exhaust flow. Cat-back exhaust systems are a popular choice, replacing the exhaust system from the catalytic converters back. Full exhaust systems, including headers, can provide even greater performance gains, but may require ECU tuning.
  • ECU Tuning: A custom ECU tune can optimize engine performance for specific modifications. A skilled tuner can adjust fuel delivery, ignition timing, and VVEL/CVTCS settings to maximize power output. Companies like UpRev and EcuTek offer popular tuning solutions for the VQ37VHR.
  • Forced Induction: Supercharger and turbocharger kits are available for the VQ37VHR, offering significant horsepower gains. However, forced induction requires extensive modifications, including upgraded fuel injectors, fuel pump, and potentially strengthened internal components.
  • Lightweight Pulley Kits: Replacing the factory pulleys with lightweight pulleys can reduce parasitic drag on the engine, freeing up a few horsepower.
  • Throttle Body Spacers: These spacers claim to improve airflow and increase horsepower, but their effectiveness is debated. Some users report noticeable improvements, while others see little to no gains.
  • Ported and Polished Cylinder Heads: Porting and polishing the cylinder heads can improve airflow and increase horsepower. This is a more advanced modification that requires specialized tools and expertise.

Important Considerations Before Modifying: Always research thoroughly before making any modifications. Ensure that the modifications are compatible with your vehicle and driving style. Consider the potential impact on reliability and emissions. And, most importantly, consult with a qualified mechanic or tuner before making any major changes.

Conclusion

The 2020 Nissan 370Z Nismo's VQ37VHR engine is a well-engineered and capable powerplant. Its VVEL technology, combined with Nismo-specific tuning and exhaust enhancements, delivers a responsive and engaging driving experience. With proper maintenance and careful modifications, this engine can provide years of reliable performance and driving enjoyment. By understanding the intricacies of the VQ37VHR, you'll be better equipped to maintain, modify, and appreciate the performance of your 370Z Nismo.

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