Introduction

The Nissan 370Z has long been a favorite among driving enthusiasts who prize its balanced chassis, responsive steering, and naturally aspirated VQ37VHR engine. While the stock 332 horsepower is respectable, many owners eventually crave more thrust. Forced induction offers the most dramatic transformation, and supercharging has emerged as the go‑to choice for those who want linear, street‑friendly power without the complexity of twin‑turbo systems. Two names dominate the aftermarket supercharger landscape for the 370Z: Vortech and Stillen. Both deliver proven power gains and extensive support, but they differ in design philosophy, output characteristics, and price. This article provides a detailed, side‑by‑side comparison of these two supercharger systems, covering power gains, pricing, installation, reliability, and real‑world drivability so you can choose the right kit for your build and budget.

Understanding Supercharging for the VQ37VHR Engine

Before diving into the specifics, it’s worth revisiting why supercharging is so effective on the 370Z. The VQ37VHR is a high‑revving 3.7‑liter V6 with a stout iron block and forged connecting rods, making it well‑suited for forced induction. Unlike turbocharging, a supercharger is driven directly by the engine’s crankshaft, providing immediate boost response with no lag. Centrifugal superchargers, like those offered by Vortech and Stillen, behave similarly to a turbo but with a more linear power curve. Both kits include an intercooler to reduce intake air temperatures, critical for maintaining power and engine longevity. Typical boost levels range from 7 to 9 psi on a stock engine, safely producing 150–200 wheel horsepower gains while retaining daily drivability and factory‑like throttle response.

Vortech Supercharger System for the Nissan 370Z

Vortech is one of the oldest names in centrifugal supercharging, with a reputation for robust engineering and high‑boost capability. Their V‑3 Si‑Trim supercharger is the heart of the kit, featuring a self‑contained oiling system that eliminates the need to tap into the engine’s oil supply. This reduces installation complexity and improves long‑term reliability.

System Design and Components

The Vortech kit includes the V‑3 Si‑Trim supercharger unit, an air‑to‑air intercooler, cast aluminum intake manifold, high‑flow fuel injectors, a fuel pump voltage booster, and a pre‑programmed ECU tune delivered via a handheld flash programmer. The intercooler is mounted in the lower front bumper area, requiring minimal cutting of the factory bumper support for fitment. Vortech designs their kits to be CARB legal (EO #D‑180‑34) for 2009‑2020 370Z models, meaning they pass emissions testing in all 50 states when installed per instructions.

Power Gains and Performance

On a stock 370Z with no other modifications, the Vortech system reliably adds 180–200 wheel horsepower and approximately 120–140 lb‑ft of wheel torque. Peak output lands in the 510–530 wheel horsepower range on premium pump fuel. The power curve is smooth and progressive, pulling hard to the 7500 rpm redline. Many owners report an increase in fuel economy during highway cruising (thanks to reduced load) and a purely addictive supercharger whine under full throttle. With supporting mods like headers, exhaust, and a larger heat exchanger, some builds exceed 600 wheel horsepower on the Vortech setup, though this requires upgraded injectors and a custom tune.

Pricing and What’s Included

As of 2025, the Vortech supercharger kit for the 370Z has a base MSRP of approximately $5,500–$6,000, depending on the retailer and current promotions. The kit includes everything needed for a complete installation: supercharger, intercooler, injectors, tune, brackets, and hardware. However, additional costs include:

  • Installation: Professional labor ranges from $1,500 to $2,500, depending on shop rates and whether you include optional upgrades (e.g., clutch, oil cooler).
  • Supporting mods: A stronger clutch is recommended (budget $800–$1,200 part + labor), as the stock clutch begins slipping near 500 wheel horsepower. Upgraded fuel injectors (already supplied) and a boost‑a‑pump are included. Expect to spend another $500–$1,000 on miscellaneous items like colder spark plugs, an oil cooler, and a catch can.

Installation Complexity

Installation is considered moderate. Experienced DIYers can complete it over a weekend with basic tools and a lift, but most owners opt for professional installation. The most labor‑intensive steps include removing the front bumper for intercooler mounting, replacing the intake manifold, and plumbing the supercharger oil lines. Vortech provides detailed instructions, and the self‑contained oil system simplifies lubrication. Expect 15–20 hours of shop time for a first‑time install.

Reliability and Customer Support

Vortech has an excellent track record for reliability when the system is installed correctly and the engine retains its stock internals. The V‑3 Si‑Trim supercharger is known for durability, with many owners reporting 50,000+ miles without issue. Vortech offers a limited lifetime warranty on the supercharger itself and support via phone and email. The pre‑loaded tune is conservative, which helps keep engine temperatures and knock levels in check. That said, using a custom dyno tune (additional $500–$800) can unlock more power and further improve drivability.

Stillen Supercharger System for the Nissan 370Z

Stillen is equally well‑established in the Nissan performance community, and their supercharger kit for the 370Z is among the best‑selling options. Like Vortech, Stillen uses a centrifugal supercharger—specifically a Rotrex C‑38‑91 unit. The Rotrex employs a unique planetary traction drive that provides extremely high efficiency and quiet operation, producing a minimal whine compared to the Vortech.

System Design and Components

Stillen’s kit includes the Rotrex supercharger, an air‑to‑air intercooler with a billet aluminum mounting bracket, high‑flow injectors, an upgraded fuel pump assembly, and a handheld tuner with a pre‑loaded calibration. The intercooler also mounts in the lower front bumper, and Stillen claims a significant reduction in intake air temperatures thanks to a larger core than some competitors. The Rotrex supercharger’s self‑contained oil system is pre‑filled and sealed, requiring no additional oil lines or pump modifications.

Power Gains and Performance

On a stock 370Z, the Stillen kit delivers 155–175 wheel horsepower and about 100–120 lb‑ft of wheel torque, bringing the car to roughly 480–500 wheel horsepower. The power delivery is exceptionally linear and smooth, with strong mid‑range punch. Because the Rotrex is more efficient at low speeds, many owners find the car easier to drive in daily traffic compared to a Vortech‑equipped car, which tends to pull harder at higher RPMs. Stillen’s tune is also conservative, ensuring safe air/fuel ratios and stable ignition timing on 91‑octane fuel.

Pricing and What’s Included

The Stillen supercharger kit has a base price of around $4,500–$5,000, making it the more affordable option upfront. The package includes the Rotrex supercharger, intercooler, all necessary brackets, injectors, fuel pump upgrade, and tune. Additional costs include:

  • Installation: Professional labor runs $1,200–$1,800, slightly lower than Vortech because the Rotrex oil system requires no external lines.
  • Supporting mods: As with Vortech, a stronger clutch is recommended (budget $800–$1,200). Stillen also recommends upgrading the oil cooler and adding a catch can (another $500–$700 total).

Installation Complexity

Stillen’s kit is widely regarded as one of the easiest supercharger installations on the 370Z. The Rotrex supercharger mounts in a similar location to Vortech’s, but the oil system is completely self‑contained and pre‑filled. The instructions are clear, and many owners have completed the installation in 10–15 hours. For a shop, expect 12–16 hours of labor.

Reliability and Customer Support

Stillen has a strong reliability record, with the Rotrex supercharger known for its durability and low noise. The company offers a limited lifetime warranty on the supercharger unit and technical support by phone and email. Because the Rotrex spins slightly slower than the Vortech V‑3 for the same boost, it generates less heat and places lower stress on the drive belt. The conservative tune further protects the engine. Many owners run the kit for 40,000+ miles without issues, though regular oil changes and using a good quality synthetic oil are critical.

Head‑to‑Head Comparison: Vortech vs Stillen

Both kits transform the 370Z into a genuine high‑performance machine, but they cater to slightly different priorities. Below is a detailed comparison across the most important factors.

Power Output and Boost Characteristics

Vortech offers a clear edge in peak horsepower, typically producing 20–30 more wheel horsepower than the Stillen kit at the same boost pressure (around 8 psi). This advantage comes from the Vortech V‑3’s higher flow capability and the ability to run more aggressive timing in the tune. However, Vortech’s power delivery is slightly more peaky, with a sharp surge starting around 3,500 RPM. Stillen’s Rotrex provides a more linear curve, pulling smoothly from 2,500 RPM to redline. For drag racing or roll‑racing, the Vortech’s top‑end rush is preferred; for canyon carving and daily driving, many favor Stillen’s flexibility.

Price and Total Cost of Ownership

Initial purchase price favors Stillen by about $1,000–$1,500. Installation costs are also lower for Stillen, leading to a total installed price closer to $6,000–$6,500 for Stillen versus $7,000–$8,500 for Vortech. However, if you plan to push beyond 550 wheel horsepower later, Vortech’s system has more headroom—Rotrex units can struggle to flow enough air at higher boost levels without upgrading the supercharger itself. Both kits require supporting fuel and cooling modifications if you increase boost, but Vortech’s foundation is more scalable.

Sound and Driving Experience

The Vortech emits a loud, high‑pitched supercharger whine that many enthusiasts crave. It’s unmistakable and adds an aggressive character to the car. Stillen’s Rotrex is much quieter, producing only a faint whir under heavy throttle; the engine note remains dominant. For stealthy performance, Stillen is the better choice. For those who want the classic supercharger symphony, Vortech wins.

Tuning and Support

Both companies provide a flash tune through a handheld programmer. Vortech uses an SCT device, while Stillen uses an UpRev or similar. Both tunes are safe and passable in terms of fuel economy and idle quality, but neither is optimized for maximum power. A custom dyno tune from a reputable shop is highly recommended for either kit—this can add 15–30 wheel horsepower and improve throttle response. Both companies offer solid tech support, though Vortech’s larger presence means more online community resources and tuners familiar with the kit.

Long‑Term Reliability

Neither system has widespread failure issues when installed correctly with proper supporting modifications. The key weak point for both is the VQ37VHR’s stock clutch, which will begin slipping at around 480–500 wheel horsepower. Replacing the clutch with a stage 2 or 3 unit (e.g., South Bend, ACT, or Competition Clutch) is strongly advised. Additionally, both superchargers stress the fuel system—Vortech’s included boost‑a‑pump helps, but Stillen includes a larger fuel pump for similar effect. Oil quality and cooling are also critical; adding an oil cooler and using a 5W‑40 synthetic oil helps maintain longevity under sustained high load.

Supporting Modifications and Tuning Considerations

Regardless of which supercharger you choose, the 370Z’s stock fuel system, cooling, and driveline will need attention. Here’s what experienced builders recommend:

  • Clutch upgrade: The stock clutch is marginal even on a naturally aspirated car. With 480+ wheel horsepower, it will slip. Budget $1,200–$1,800 for a clutch and flywheel, plus labor.
  • Fuel system: Both kits come with upgraded injectors and a fuel pump solution, but adding a true return‑style fuel system becomes necessary if you plan to run E85 or push beyond 550 wheel horsepower.
  • Cooling: An aftermarket oil cooler (e.g., Setrab or Mishimoto) is almost mandatory for track use. A larger heat exchanger for the supercharger intercooler can reduce intake temperatures by 15–20°F.
  • Drivetrain: The stock rear differential may not hold up to repeated hard launches; consider upgrading to an LSD with stronger axles if you’re drag racing.
  • Tuning: A custom dyno tune by a qualified Nissan tuner (e.g., Z1 Motorsports, Admin Tuning, or Specialty Z) will fine‑tune air/fuel ratios, ignition timing, and boost control. Expect to pay $500–$800 for a custom tune.

Community Feedback and Real‑World Experience

Online forums and owner surveys provide valuable insight. On sites like the370z.com and My350Z.com, Vortech owners tend to be more focused on maximum power and track performance, while Stillen owners often prioritize daily drivability and easier installation. Complaints for Vortech include a slightly higher incidence of belt slip at higher boost levels (solved with a better tensioner and pulley), and a more involved installation. Stillen owners occasionally report difficulty with the Rotrex supercharger’s oil seals over very high mileage (80,000+ miles), though failures are rare. Both systems have strong aftermarket support and parts availability.

External Resources and Further Reading

For more detailed specifications and purchase options, visit the official manufacturer pages:

Conclusion: Which Supercharger Is Right for Your 370Z?

Choosing between Vortech and Stillen ultimately comes down to your performance goals, budget, and tolerance for mechanical involvement. If your priority is raw horsepower, top‑end acceleration, and a dramatic supercharger whine, the Vortech system is the clear winner. It offers higher peak output and greater headroom for future upgrades, albeit at a higher initial cost and more complex installation. If you value a more affordable turnkey solution with excellent daily‑driver manners and easier installation, the Stillen kit is an outstanding choice. Its linear power delivery and quiet operation make it ideal for those who want a sleeper build or primarily drive on public roads. In both cases, proper supporting modifications—especially a clutch upgrade and custom tune—will maximize reliability and enjoyment. Whichever path you take, your 370Z will become a genuinely thrilling machine capable of embarrassing far more expensive metal.