Nissan 370Z: GReddy Twin Turbo Kit Install & Review

So, you're a Nissan 370Z enthusiast, huh? You love the sleek lines, the responsive handling, and that throaty VQ engine. But let's be honest, sometimes you crave more. More power, more thrill, more head-snapping acceleration. Well, my friends, the GReddy Twin Turbo Kit for the 370Z might just be your ticket to automotive nirvana. This isn't just a bolt-on upgrade; it's a complete transformation that turns your already potent Z into an absolute monster. We're talking serious horsepower gains, improved torque, and a driving experience that will leave you grinning from ear to ear. But before you go rushing out to buy one, let's dive deep into what this kit entails, what kind of performance you can expect, and what you need to consider before taking the plunge.

Why Go Twin Turbo on Your 370Z?

Before we get into the specifics of the GReddy kit, let's address the elephant in the room: why bother with a turbocharger at all? The VQ37VHR engine in the 370Z is already a capable performer, delivering around 332 horsepower in stock form (or 350 hp in the Nismo variant). However, for many enthusiasts, that's simply not enough. Naturally aspirated engines, like the VQ37, rely on drawing in air through the intake manifold using the vacuum created by the pistons. This limits the amount of air that can enter the cylinders, which in turn limits the amount of fuel that can be burned and, ultimately, the amount of power that can be produced. Turbochargers, on the other hand, force more air into the engine, allowing it to burn more fuel and generate significantly more power. A twin-turbo setup, like the GReddy kit, uses two smaller turbochargers instead of one large one. This offers several advantages, including reduced turbo lag (the delay between pressing the accelerator and the turbocharger spooling up) and improved throttle response. The result is a more linear and predictable power delivery, making the car easier to drive both on the street and on the track. Beyond the raw power gains, a turbocharger can also improve the overall driving experience by increasing torque across the entire rev range. This means you'll have more power available at lower RPMs, making the car feel more responsive and eager to accelerate in any gear. Overtaking becomes effortless, and climbing hills is a breeze. And let's not forget the sound! The unmistakable whistle of a turbocharger spooling up is a sound that any gearhead can appreciate, adding an extra layer of excitement to every drive.

The GReddy Twin Turbo Kit: What's Included?

The GReddy Twin Turbo Kit is a comprehensive package designed to provide everything you need to safely and reliably boost your 370Z. It's not just a couple of turbochargers thrown in a box; it's a meticulously engineered system that's been developed and tested to ensure optimal performance and durability. So, what exactly do you get for your money? At the heart of the kit are, of course, the two GReddy TD06SH-20G turbochargers. These are relatively small, quick-spooling turbos that are perfectly matched to the VQ37 engine. They provide a significant boost in power without sacrificing throttle response or creating excessive lag. The kit also includes a pair of cast iron exhaust manifolds that are designed to efficiently channel exhaust gases to the turbochargers. These manifolds are made from high-quality materials and are built to withstand the extreme temperatures and pressures generated by a turbocharged engine. To keep the intake air cool and dense, the GReddy kit features a large front-mounted intercooler. This intercooler is significantly larger than the stock intercooler and is designed to efficiently dissipate heat, preventing power-robbing heat soak. The kit also includes all the necessary piping, hoses, and clamps to connect the turbochargers, intercooler, and intake manifold. These components are made from high-quality materials and are designed to withstand the rigors of a turbocharged engine. Perhaps one of the most important components of the GReddy kit is the GReddy e-Manage Ultimate engine management system. This piggyback ECU allows you to fine-tune the engine's fuel and ignition maps to optimize performance and ensure safe operation. The e-Manage Ultimate is a sophisticated piece of hardware that requires professional tuning, but it's essential for getting the most out of the turbo kit.

Installation: A DIY Project or Professional Job?

Now, let's talk about installation. Can you install the GReddy Twin Turbo Kit yourself? The short answer is: it depends. If you're a highly experienced mechanic with a well-equipped garage and a thorough understanding of engine management systems, then it's possible to install the kit yourself. However, for most people, professional installation is highly recommended. This isn't a simple bolt-on upgrade like installing a cold air intake or an exhaust system. It's a complex and involved process that requires a significant amount of time, specialized tools, and technical expertise. The installation process involves removing the stock exhaust manifolds, installing the new turbo manifolds, mounting the turbochargers, installing the intercooler and piping, and wiring up the e-Manage Ultimate. Each of these steps requires careful attention to detail and can be challenging for even experienced mechanics. But the real challenge lies in tuning the e-Manage Ultimate. This requires a dyno and a skilled tuner who can properly calibrate the engine's fuel and ignition maps to optimize performance and ensure safe operation. Improper tuning can lead to serious engine damage, so it's not something to be taken lightly. Even if you're confident in your mechanical abilities, it's often worth the investment to have a professional shop install and tune the GReddy kit. They'll have the experience and expertise to do the job right, and they'll be able to provide you with peace of mind knowing that your engine is running safely and efficiently. Plus, a professional installation will typically come with a warranty, which can protect you in case of any problems down the road.

Performance Gains: How Much More Power?

Alright, let's get to the good stuff: how much more power can you expect from the GReddy Twin Turbo Kit? The answer, as with most modifications, depends on several factors, including the boost level, the quality of the tune, and the overall health of your engine. However, in general, you can expect to see a significant increase in both horsepower and torque. On a stock 370Z, the GReddy kit typically produces around 450-500 horsepower at the wheels, running at a relatively conservative boost level of around 7-8 psi. That's a gain of around 120-170 horsepower over stock! And with a more aggressive tune and higher boost levels, it's possible to extract even more power from the kit. However, it's important to remember that pushing the engine too hard can lead to premature wear and tear, or even engine failure. So, it's always best to err on the side of caution and work with a reputable tuner who can help you find the sweet spot between performance and reliability. The torque gains are equally impressive. The GReddy kit can significantly increase torque across the entire rev range, making the car feel much more responsive and powerful. This is especially noticeable at lower RPMs, where the stock engine can sometimes feel a bit sluggish. With the turbo kit installed, you'll have instant power on tap, making overtaking and accelerating a breeze. But the performance gains aren't just about numbers. The GReddy kit also transforms the overall driving experience. The car feels much more eager and responsive, and the acceleration is simply breathtaking. The sound of the turbochargers spooling up adds an extra layer of excitement to every drive, making you feel like you're behind the wheel of a true performance machine.

Potential Drawbacks: What to Consider

No modification is without its potential drawbacks, and the GReddy Twin Turbo Kit is no exception. Before you commit to installing this kit, it's important to be aware of the potential downsides. One of the biggest concerns is the cost. The GReddy kit is not cheap, and the installation and tuning can add significantly to the overall expense. You'll need to factor in the cost of the kit itself, as well as the cost of installation, tuning, and any supporting modifications that may be required. Another potential drawback is the increased complexity of the engine. Adding a turbocharger adds a significant number of components to the engine, which can increase the risk of mechanical problems. It's important to properly maintain the turbo kit and address any issues promptly to prevent more serious damage. Increased heat is another concern. Turbochargers generate a lot of heat, which can put extra strain on the engine's cooling system. You may need to upgrade your radiator, oil cooler, and other cooling components to ensure that the engine stays within safe operating temperatures. Finally, it's important to consider the impact on the car's reliability. While the GReddy kit is designed to be reliable, it's still a significant modification that can potentially shorten the lifespan of the engine. It's important to drive responsibly and avoid pushing the engine too hard, especially when it's cold. Overall, the GReddy Twin Turbo Kit is a fantastic upgrade for the 370Z, but it's important to weigh the potential benefits against the potential drawbacks before making a decision. If you're prepared to invest the time and money required to install and maintain the kit properly, you'll be rewarded with a truly incredible driving experience.

Alternatives to the GReddy Kit

While the GReddy Twin Turbo Kit is a popular choice for 370Z enthusiasts, it's not the only option available. There are several other turbocharger and supercharger kits on the market that offer similar performance gains. One alternative is the Stillen Supercharger Kit. Superchargers are similar to turbochargers in that they force more air into the engine, but they're driven by the engine's crankshaft rather than exhaust gases. Superchargers typically provide more immediate throttle response than turbochargers, but they may not be as efficient at higher RPMs. Another option is the Turbosmart Twin Turbo Kit. This kit uses high-quality Turbosmart turbochargers and offers similar performance to the GReddy kit. However, it may require more custom fabrication and tuning to get it running properly. If you're looking for a more budget-friendly option, you might consider a single turbo kit. Single turbo kits are typically less expensive than twin-turbo kits, but they may not offer the same level of performance or throttle response. Ultimately, the best option for you will depend on your budget, your performance goals, and your mechanical abilities. It's important to do your research and compare the different options before making a decision.

Conclusion: Is the GReddy Twin Turbo Kit Right for You?

So, is the GReddy Twin Turbo Kit right for you and your Nissan 370Z? If you're craving serious power gains, improved throttle response, and a truly exhilarating driving experience, then the answer is likely yes. The GReddy kit is a well-engineered and comprehensive package that can transform your Z into a beast on the street or the track. However, it's important to remember that this is a significant modification that requires a significant investment of time and money. You'll need to be prepared to pay for the kit itself, as well as the installation, tuning, and any supporting modifications that may be required. You'll also need to be prepared to properly maintain the turbo kit and address any issues promptly to prevent more serious damage. If you're willing to accept these responsibilities, then the GReddy Twin Turbo Kit can be an incredibly rewarding upgrade that will take your 370Z to the next level. Just imagine the look on people's faces as you blast past them with the unmistakable sound of turbochargers whistling in your wake. It's an experience that any true gearhead can appreciate. So, go ahead, unleash the beast! Just be sure to do your research, work with a reputable shop, and drive responsibly. Happy boosting!