Unleash Your 370Z: The VQ37VHR Power Upgrade

The Nissan 370Z, with its potent VQ37VHR engine, is a performance car that practically begs for more power. While the factory-tuned 3.7-litre V6 already offers a respectable 300-332 bhp depending on the model year and transmission, many enthusiasts crave that extra surge of adrenaline that only significant horsepower gains can provide. The question on many minds is: can you modify a 370Z engine to achieve substantially more power? The answer is a resounding yes, and it centres around the renowned VQ37VHR engine's inherent capabilities and the availability of high-quality performance parts.

The VQ37VHR: A Foundation for Power

The VQ37VHR (Variable Valve Event and Lift) engine is a marvel of modern engineering. Its advanced VVEL system allows for precise control over valve timing and lift, optimising both performance and fuel efficiency. This sophisticated engine architecture provides a robust foundation for significant power upgrades. Whether you're aiming for a modest increase to overcome the 300hp mark or aspiring to a formidable 800hp, the VQ37VHR can be tailored to meet your demands.

From Stock 300HP to High-Performance 800HP: The Rebuild Kit Solution

For those looking to push the boundaries of their 370Z or its Infiniti G37 sibling, a comprehensive engine rebuild kit is often the most effective and reliable route. Such kits are designed to replace critical internal components with stronger, more durable parts capable of handling increased boost pressures and combustion forces. A prime example is a standard rebuild kit specifically curated for the VQ37VHR engine. This kit is engineered to elevate your vehicle's performance from its stock 300 horsepower all the way up to an exhilarating 800 horsepower.

Key Components of a Performance Rebuild Kit

A high-quality performance rebuild kit is not just a collection of parts; it's a carefully selected suite of components designed to work in synergy. For the VQ37VHR, a typical performance-oriented kit will include:

• Wiseco Forged Pistons: Stock pistons are often cast and are the weakest link when significantly increasing horsepower. Forged pistons, like those from Wiseco, are manufactured from a single block of aluminium that is heated and hammered into shape. This process creates a denser, stronger, and more resilient piston that can withstand higher temperatures and pressures associated with forced induction (turbocharging or supercharging) and increased boost levels. They are crucial for preventing piston failure under extreme stress.
• Eagle Forged Performance Rods: Connecting rods are responsible for transferring the power from the pistons to the crankshaft. Like pistons, stock connecting rods can be a point of failure in a high-performance engine. Eagle Forged Performance Rods are engineered from high-strength steel alloys and are typically H-beam or I-beam in design, offering superior rigidity and durability compared to their cast counterparts. These rods are essential for handling the increased G-forces and reciprocating mass in a high-output engine.

The Importance of Customisation and Lead Times

While off-the-shelf kits offer a fantastic starting point, achieving specific power goals, especially at the higher end of the spectrum (like 800hp), often requires customisation. This might involve specific compression ratios tailored to your chosen fuel or forced induction setup, different bore sizes, or bespoke piston ring configurations. It's important to note that custom components, such as custom Wiseco pistons, will have a production lead time. As indicated, custom pistons can typically take 4-6 weeks to produce. This lead time is a testament to the precision engineering and manufacturing involved in creating parts that perfectly match your engine's unique requirements.

What is Required to Reach 800HP?

Achieving an 800hp target with a VQ37VHR is a significant undertaking that goes beyond just internal engine components. While forged internals are the bedrock, several other crucial modifications are necessary:

• Forced Induction: To reach 800hp, you will almost certainly need a robust forced induction system. This could be a twin-turbocharger setup or a high-output supercharger. The size and efficiency of the turbos or supercharger, along with the supporting plumbing, intercooling, and wastegate control, are critical.
• Fueling System: More air requires more fuel. This means upgrading to high-flow fuel injectors, a more capable fuel pump (or multiple pumps), and potentially a higher-capacity fuel rail and regulator system to ensure consistent fuel delivery under high demand.
• Engine Management (ECU Tuning): The factory ECU is not designed to manage the fuel and ignition timing requirements of an 800hp engine. A custom ECU tune, often achieved through standalone engine management systems or reprogramming the factory ECU, is absolutely essential. This allows for precise control of air-fuel ratios, ignition timing, boost levels, and other parameters to maximise power safely.
• Cooling System: More power generates more heat. An upgraded radiator, oil cooler, and potentially a more efficient intercooler are vital to keep engine temperatures within safe operating limits and prevent detonation.
• Exhaust System: A less restrictive exhaust system, including larger diameter piping and high-flow catalytic converters (or cat delete pipes, where legal), is necessary to allow the engine to expel exhaust gases efficiently, especially when dealing with the increased volume from forced induction.
• Drivetrain Upgrades: Transmitting 800hp reliably will likely require upgrades to the clutch, transmission, driveshaft, and differential to handle the increased torque and power without failure.

Can a G37 Engine Fit a 370Z?

This is a common question among enthusiasts due to the shared VQ37VHR engine platform. In most cases, yes, a VQ37VHR engine from a G37 (Infiniti Q40, Q60, or Q70) can be fitted into a 370Z, and vice versa. Both vehicles utilise the same fundamental engine block, cylinder heads, and VVEL system. However, there are often differences in the intake manifold, exhaust manifolds, sensors, engine mounts, and accessories (like the alternator and power steering pump). These differences mean that while the core engine is compatible, some component swapping or modification might be necessary to ensure a seamless integration. It's always advisable to compare specific part numbers and consult with a specialist familiar with both platforms.

Frequently Asked Questions

Q1: What is the stock horsepower of a 370Z?

The stock horsepower for a Nissan 370Z typically ranges from 300 bhp to 332 bhp, depending on the specific model year and whether it's equipped with a manual or automatic transmission. Early models generally produced around 300-306 bhp, while later models saw an increase to 328-332 bhp.

Q2: How much does it cost to build a 370Z for 800hp?

Building a 370Z to reliably produce 800hp is a significant investment. The cost can vary widely depending on the quality of parts chosen, whether you do the labour yourself or pay a professional, and the specific supporting modifications required. A rough estimate would place the cost anywhere from £15,000 to £30,000+ (or $20,000 to $40,000+ USD), encompassing the engine internals, forced induction, fueling, tuning, cooling, exhaust, and drivetrain upgrades.

Q3: Are Wiseco pistons good for high-performance VQ37VHR engines?

Yes, Wiseco forged pistons are widely regarded as an excellent choice for high-performance VQ37VHR engines. Their forged construction provides the strength and durability needed to withstand the increased cylinder pressures and temperatures associated with significant power upgrades, particularly when used with forced induction.

Q4: How long does it take to install an engine rebuild kit?

The time it takes to install an engine rebuild kit can vary greatly depending on the mechanic's experience, the complexity of the build, and whether any unforeseen issues arise during the engine disassembly and reassembly process. For a professional shop, a full engine rebuild with a performance kit could take anywhere from a few days to a couple of weeks. If you are including custom parts with longer lead times, the overall project duration will naturally be extended.

Q5: What are the benefits of forged rods and pistons?

The primary benefits of forged rods and pistons are their significantly increased strength, durability, and resistance to failure under high stress. Forged components are less prone to bending, cracking, or breaking compared to cast components, making them essential for engines producing substantially more power than stock, especially those employing forced induction or high-octane race fuels.

Conclusion

Modifying a 370Z engine to unlock its full potential, whether aiming for a moderate power increase or a formidable 800hp, is an achievable goal. The VQ37VHR is a capable powerplant, and with the right components, such as Wiseco forged pistons and Eagle forged performance rods, combined with meticulous planning and supporting modifications, you can transform your Z car into a truly exceptional performance machine. Remember that achieving higher power levels requires a holistic approach, addressing all aspects of the engine and drivetrain to ensure reliability and longevity.