engine-modifications
How to Increase Nissan 370z Horsepower with Forced Induction
Table of Contents
The Nissan 370Z, powered by the VQ37VHR engine, has long been a favorite among driving enthusiasts for its sharp handling, distinctive styling, and naturally aspirated V6 performance. However, even with its 332 horsepower from the factory, many owners find themselves craving more. The most impactful way to unlock the 370Z's potential is through forced induction—either a turbocharger or a supercharger. This article provides an authoritative, in-depth guide to increasing horsepower on your 370Z, covering system selection, supporting modifications, installation, and real-world expectations. Whether you are chasing 400 whp for a street machine or building a track monster, understanding these fundamentals is key to a successful build.
Understanding Forced Induction Fundamentals
Forced induction works by increasing the density of the air entering the engine, allowing more fuel to be burned per cycle. This directly translates to greater power output. The two primary methods—turbocharging and supercharging—achieve this in fundamentally different ways, each with distinct advantages and trade-offs for the 370Z platform.
Turbochargers: Exhaust-Driven Power
Turbochargers use the energy from exhaust gases to spin a turbine wheel, which in turn compresses intake air. Because they are driven by waste energy, turbos can be very efficient, but they introduce a degree of lag—the delay between pressing the throttle and seeing boost build. On the 370Z, single-turbo setups (large single) and twin-turbo kits are common. Twin-scroll designs help reduce lag while maintaining high peak power.
Superchargers: Instant Response
Superchargers are mechanically driven via a belt from the engine's crankshaft. They provide boost immediately, giving the 370Z a linear, naturally aspirated-like power delivery. Centrifugal superchargers (such as those from Stillen or Vortech) are popular for the VQ37 because they offer good top-end gains without the excessive heat soak of roots or twin-screw designs. The trade-off is lower peak efficiency compared to a turbo, but with simpler installation and no need for complex oil line routing.
Selecting a Forced Induction System for Your 370Z
Choosing the right kit depends on your power goals, budget, and intended use. Below are the most reputable options available for the Nissan 370Z, each with its own character.
Supercharger Kits
Supercharger kits are often preferred for daily drivers because they maintain stock-like drivability. The Stillen Supercharger Kit is the most well-known, using a Vortech centrifugal unit to deliver reliable gains of roughly 100-120 whp with proper tuning. Other options include the Vortech V3 Si and the AAM Competition supercharger. Installation is generally simpler than a turbo, but you must upgrade the fuel system (injectors, pump) and ensure proper heat management.
Turbocharger Kits
For those seeking higher peak power, turbo kits are the top choice. The Fast Intentions Twin Turbo Kit is a benchmark, supporting over 600 whp with supporting modifications. The Greddy Twin Turbo Kit and Brixton Forged Single Turbo Kit are also popular. Twin-turbo setups tend to offer quicker spool, while single-turbo kits can be more efficient for very high power targets. Regardless of kit, expect to invest heavily in fueling, engine management, and drivetrain upgrades.
Understanding Kit Components
Most complete kits include the turbocharger(s) or supercharger, intercooler (for turbos), piping, blow-off valve or bypass valve, and necessary brackets. However, many do not include the requisite tuning or fuel system components. Always verify what is included before purchasing.
Essential Supporting Modifications
Installing a forced induction system without supporting upgrades is a recipe for engine failure. The VQ37VHR is robust, but it requires a holistic approach to handle the extra stress.
Fuel System Upgrades
The stock fuel injectors and pump cannot supply enough fuel beyond about 400 whp. For lower boost supercharger setups, upgraded 550cc or 600cc injectors and an in-line fuel pump (such as a Walbro 450) are sufficient. For turbo builds above 500 whp, move to 1000cc injectors, a dedicated return-style fuel system, and possibly a larger fuel rail.
Engine Management and Tuning
Proper tuning is non-negotiable. The 370Z's ECU can be tuned via UpRev software (OSIRIS or VFlash) or with standalone units like Haltech or ECUtek. UpRev is common for supercharger kits, while standalone ECUs are often used for high-horsepower turbo builds. A competent tuner will dial in air-fuel ratios, ignition timing, and boost control to keep the engine safe and make the most of the hardware.
Cooling Systems
Forced induction dramatically increases heat. A larger intercooler or a more efficient heat exchanger (for superchargers with air-to-water intercoolers) is critical. If your kit does not include an intercooler, budget for one. Additionally, an oil cooler (such as a Setrab or Mishimoto unit) is mandatory for track use, and a high-flow radiator helps keep water temperatures in check.
Exhaust System
The stock exhaust creates a bottleneck. A full cat-back exhaust (such as Motordyne ART pipes or Fast Intentions) reduces backpressure and improves spool. For turbo kits, a dump pipe or downpipe upgrade is essential. For superchargers, a free-flowing exhaust enhances the induction sound and adds a few horsepower.
Drivetrain Upgrades
With more power comes increased strain on the clutch and transmission. The stock clutch will slip above 400 whp. A heavy-duty clutch (like the Competition Clutch Stage 3 or 4) and a lightweight flywheel are recommended. The 370Z's manual transmission is generally reliable up to around 550 whp, but beyond that, stronger gears (from PPG or Z1 Motorsports) may be needed. Automatic transmission owners should consider a torque converter upgrade and a transmission cooler.
Installation Considerations
Installing a forced induction system is a major undertaking that requires mechanical competence, patience, and the right tools.
Professional Install vs. DIY
Unless you are an experienced mechanic, hiring a shop that specializes in Nissan VQ engines is strongly advised. Labor costs for a turbo kit installation can range from $2,000 to $5,000. DIY installation is possible with a detailed guide (many kits come with them), but mistakes can be expensive. Common pitfalls include improper oil line routing (turbos), failing to properly torque bolts, and neglecting to upgrade the fuel pressure regulator.
Kit-Specific Challenges
Supercharger kits are generally easier to install because they do not require tapping oil lines. Turbo kits require fabricating or modifying exhaust manifolds, routing intercooler piping, and managing heat shielding. After installation, a thorough check for boost leaks (using a smoke machine) and a cautious base tune are essential before romping on the throttle.
Expected Performance Gains and Trade-Offs
Realistic power numbers depend on boost level, fuel quality, and supporting mods. Here is a rough breakdown: