For Infiniti owners in Nashville who crave more power, installing a nitrous oxide (N2O) system is one of the most cost-effective ways to add serious horsepower without replacing the entire drivetrain. However, a nitrous setup is not a simple bolt-on—it requires careful planning, expert installation, and ongoing attention to safety. This guide covers everything you need to know about adding nitrous to your Infiniti in the Nashville area, from understanding system types to finding qualified technicians and maintaining reliability.

Understanding Nitrous Oxide Systems

Nitrous oxide is a compressed gas that releases extra oxygen when it decomposes under engine heat. This additional oxygen allows you to inject more fuel, creating a much bigger combustion event and a corresponding increase in horsepower. The cooling effect of the expanding gas also reduces intake air temperatures, further improving volumetric efficiency. For Infiniti owners running VQ-series engines (VQ35, VQ37, VR30) or even older VG engines, nitrous can transform a daily driver into a weekend warrior.

How Nitrous Works

A basic nitrous system consists of a bottle, a solenoid, a nozzle or plate, and plumbing. When activated, the solenoid opens, allowing nitrous and additional fuel to be sprayed into the intake tract. The key is maintaining the correct air-fuel ratio: too much nitrous without fuel causes a lean condition that can destroy pistons and rings. Modern kits include integrated fuel solenoids or fuel pressure regulators to keep the mixture safe. The amount of power added is controlled by nozzle size, bottle pressure, and how long the system is used.

Types of Nitrous Kits for Infiniti Vehicles

Wet vs. Dry Systems — Wet kits mix nitrous and fuel before entering the intake, which is safer for Infiniti’s direct-injection engines since fuel is added through the nozzle. Dry kits rely on the engine’s existing fuel injectors to add extra fuel, which can work on port-injection models like the VQ35DE but is riskier on later GDI engines. For most modern Infiniti vehicles, a wet plate system or a direct-port wet system is recommended.

Direct-Port Systems — These route a dedicated nitrous/fuel line to each intake runner, delivering the most even distribution and highest potential power. They are the best choice for Infiniti owners aiming for 150+ horsepower shots, but installation is more involved and requires drilling or custom intake manifolds.

Plate Systems — A plate sits between the throttle body and intake manifold, spraying nitrous and fuel into the incoming air. These are simpler to install and suit 50–125 horsepower gains, making them popular for weekend drag racing or occasional spirited driving on Nashville’s highways.

Infiniti Engine Considerations

Infiniti engines are generally robust, but they have specific weaknesses. The VQ series uses a lightweight block and cast pistons; sustained high-nitrous loads above 150 hp can lead to ring land failure or rod bending. Upgraded fuel pumps, colder spark plugs (one step colder per 50 hp), and a timing retard device are essential for reliability. The VR30 twin-turbo engine in newer Q60/Q50 models has forged internals and can handle more nitrous but requires careful tuning to avoid overboosting. Always consult a builder familiar with Infiniti platforms before choosing a shot size.

Benefits of Nitrous for Your Infiniti

  • Significant horsepower increase — Gains of 50–200+ horsepower are achievable with the right kit, often costing less than a supercharger or turbo upgrade.
  • Enhanced acceleration — The instant torque delivery of nitrous makes a noticeable difference in 0–60 times and rolling pulls, especially on Infiniti models that are heavy from the factory.
  • Cost-effective performance — A complete wet kit with bottle, solenoids, and wiring can be purchased for under $1,000, while installation labor in Nashville often runs $400–$800.
  • Customizable boost — By swapping jets, you can adjust the power output from a mild 50 shot to race-level 200 shot, making the system adaptable for street, track, or drag strip.
  • Reversible upgrade — Unlike forced induction, a nitrous system can be removed easily if you sell the car or want to return to stock, preserving resale value.

Selecting the Right Kit for Your Infiniti

Choosing a kit requires matching your engine type, intended use, and budget. For a daily-driven Infiniti G35 or G37, a 75–125 horsepower wet plate kit from brands like Nitrous Express, ZEX, or Nitrous Outlet provides safe, repeatable gains without stressing the driveline. For track-focused builds, consider a direct-port system with a progressive controller to ramp in power. Always verify that the kit includes a fuel solenoid and all necessary fittings; avoid universal kits that require custom fabrication. Popular sources for Infiniti-specific nitrous parts include Nitrous Express and Nitrous Outlet, both of which offer application-specific instructions.

Finding a Professional Installer in Nashville

Nashville has a growing performance car scene, but not every shop is experienced with nitrous systems. Look for facilities that specialize in forced induction or fuel-system upgrades—these technicians understand the importance of correct fuel pressure, nozzle placement, and safety wiring. Check their portfolio for Infiniti builds, and ask if they have experience with the specific engine in your car (VQ35HR, VQ37VHR, VR30, etc.). Reputable shops in the Nashville area include performance specialists like Nashville Auto Sports and Mid TN Mustang & Performance (despite the name, they work on Japanese cars). Also consider shops that are certified by the NitrousOutlet installation network or have a Dynojet for post-installation tuning. Verify licenses, insurance, and read recent Google reviews specific to nitrous installations—not just general maintenance. Asking local Infiniti clubs or Facebook groups like “Nashville Infiniti Owners” can yield first-hand referrals.

Installation Process Overview

A professional nitrous installation follows a methodical process. Attempting this yourself without advanced mechanical knowledge can lead to engine damage or fires. Here’s what a typical install at a Nashville shop involves:

  1. Pre-installation inspection — The shop reviews your Infiniti’s fuel pump, fuel injectors, and ignition system. Any weak components should be upgraded before adding nitrous. They also check for existing mechanical issues like vacuum leaks or worn spark plugs.
  2. Kit selection and fitment check — Based on your power goals, they select a nozzle or plate size and verify that the kit includes brackets and hoses compatible with your engine bay layout. For VQ engines, the plate often mounts between the throttle body and the upper intake plenum.
  3. Bottle mounting — The nitrous bottle is typically secured in the trunk with a custom bracket. The shop ensures it is mounted at the correct angle (usually 15–20 degrees with the valve up) for proper siphon pickup. They also route a blow-down tube outside the vehicle as a safety measure, per NHRA and local safety codes.
  4. Plumbing — Braided stainless-steel lines run from the bottle to the solenoid, then to the nozzle/plate. All connections are double-checked with thread sealant and torque specs. Fuel lines are tapped from the fuel rail (on port-injection engines) or a dedicated fuel pressure regulator for direct-injection builds.
  5. Electrical wiring — The system is wired through a relay and a switch (often a momentary toggle or a WOT (wide-open throttle) switch). The shop splices into the fuel pump power wire to ensure the system only activates when the pump is running. A remote bottle opener may also be installed for convenience.
  6. Safety interfaces — Many shops install a pressure gauge (mechanical or electrical) to monitor bottle level. An arming switch, often hidden, prevents accidental activation. Window switches can be added to disable the system below a certain RPM (e.g., 3,000) and above another (e.g., 6,500) to protect the engine.
  7. Calibration and testing — Using a wideband oxygen sensor, the shop adjusts the jetting to achieve a safe air-fuel ratio (around 12.0–12.5:1 for wet nitrous). They perform a static leak test by pressurizing the lines, then a dynamic drive test to confirm proper actuation and no hesitation.

Post-installation, the shop should provide a log sheet with recommended jet sizes, bottle pressure settings (typically 900–950 psi), and a refill schedule. Reputable installers will also suggest a follow-up inspection after 500 miles to re-torque fittings and check for stress cracks.

Safety Precautions and Tuning

Nitrous is safe only when respected. The following precautions are non-negotiable for Infiniti owners in Nashville:

  • Use quality components — Avoid generic kits that lack fuel enrichment. Sticking to established brands ensures proper metering and materials rated for high pressure.
  • Professional installation — Even if you are handy, having a certified shop handle the plumbing and wiring reduces fire risk from loose connections or improper bottle orientation.
  • Fuel system upgrades — For shots over 100 hp, upgrade your fuel pump to a Walbro 255 or AEM 340. On direct-injection engines, consider a secondary port-injection system to deliver the extra fuel needed.
  • Retard ignition timing — Nitrous increases cylinder pressure and temperature. Your shop should install a timing retard device (like the MSD Timing Master) and pull back 2–4 degrees per 100 hp. Alternatively, a tuner can adjust the ECU map for nitrous use.
  • Use colder spark plugs — Change to plugs one or two steps colder (e.g., NGK BKR7E for a 100-shot) and gap them slightly tighter (0.032–0.035 inches) to prevent misfire under load.
  • Monitor bottle pressure — Excess pressure (above 1,100 psi) can cause solenoid failure. In Nashville’s summer heat, keep the bottle in a shaded area or use a bottle heater to maintain consistent 950 psi. A blow-off valve is a worthwhile addition.
  • Never exceed the engine’s mechanical limits — Infiniti automatic transmissions (especially the 5-speed and 7-speed) can handle up to 500 ft-lbs with a cooler, but the rods and pistons are the weak point. Stick to a 125 hp or less for reliability on high-mileage engines.

For deeper safety guidelines, read this comprehensive article from Hot Rod Network on safe nitrous installation. Additionally, EngineLabs.com offers pro-level tips for tuning and bottle handling.

Cost Considerations

In Nashville, a standard wet-plate nitrous system installed on a G37 or Q50 typically costs between $1,200 and $2,200, including parts and labor. Premium direct-port setups with progressive controllers can exceed $3,500. Factor in the following ongoing costs:

  • Nitrous refills — A 10-lb bottle costs roughly $40–$60 to fill at local welding supply stores or dedicated speed shops. A full bottle lasts about 30–60 seconds of use depending on jet size.
  • Spark plugs — Changing plugs every 5,000 miles or after heavy track use adds $60–$100 per set.
  • Tuning — If your Infiniti requires a custom ECU tune to handle the fuel enrichment, budget $300–$600 from a remote or local tuner.
  • Insurance — Check with your provider; nitrous modifications may require additional coverage or a statement of declination for track use.

While nitrous is inexpensive for the power gained, running costs add up if you use it regularly. Many Nashville owners reserve the system for track days or highway pulls to minimize refill frequency.

Conclusion

Adding a nitrous oxide system to your Infiniti in Nashville can deliver exhilarating acceleration and a huge power-per-dollar ratio. The key is to approach the upgrade with respect for the technology: choose the right kit for your engine, invest in professional installation, and commit to ongoing maintenance. Nashville has skilled shops that can handle the work, and with proper tuning, your Infiniti can safely run nitrous for years without reliability compromises. Whether you are chasing a faster quarter-mile at Music City Raceway or simply want a thrilling daily driver, a well-installed nitrous system turns a luxury sedan into a serious performer. Always prioritize safety over peak power, and enjoy the new wave of torque that only a controlled shot of N2O can deliver.