The Garrett GTX 2867R Supercharger for Subaru BRZ: A Complete Guide to 350+ Horsepower

The Subaru BRZ has long been celebrated as a driver's car, offering sharp handling, a low center of gravity, and an engaging chassis. However, its factory power output has always left enthusiasts wanting more. The Garrett GTX 2867R supercharger has emerged as a premier solution for those seeking to transform the BRZ into a genuine performance machine without sacrificing the car's balanced character. This comprehensive guide explores everything you need to know about achieving 350+ horsepower reliably with this proven forced induction system.

Understanding the BRZ Power Gap

The Subaru BRZ and its twin, the Toyota GR86, ship with a 2.4-liter naturally aspirated boxer engine producing approximately 228 horsepower in current models. While adequate for daily driving, the engine's torque curve leaves room for improvement, particularly in the mid-range where forced induction makes its most dramatic impact. The Garrett GTX 2867R supercharger addresses this gap by delivering consistent boost across the rev range, transforming the driving experience from merely enjoyable to genuinely thrilling.

Many owners find that the stock BRZ struggles to compete with turbocharged competitors in straight-line acceleration, and the aftermarket has responded with multiple forced induction solutions. The GTX 2867R stands apart because it pairs modern compressor wheel technology with a supercharger's characteristic instant response, creating a hybrid approach that delivers the best of both worlds.

Garrett GTX 2867R Supercharger: Technical Overview

The Garrett GTX 2867R represents a significant evolution in forced induction design. Unlike traditional superchargers that rely on roots-type or twin-screw designs, the GTX 2867R employs advanced compressor wheel geometry originally developed for high-performance turbochargers. This technology transfer results in a supercharger that moves air more efficiently while generating less heat.

Compressor Wheel Technology

The "GTX" designation refers to Garrett's next-generation compressor wheel design, which features extended tip technology and advanced aerodynamics. These improvements allow the 2867R to flow approximately 15-20 percent more air than its predecessor, the GT2867RS, at the same boost pressure. For the BRZ engine, this translates directly into higher horsepower potential without requiring excessive boost levels that could compromise reliability.

Ball Bearing Center Section

A critical differentiator is the dual ball bearing cartridge that replaces traditional journal bearings. This construction reduces friction during cold starts, improves spool response, and extends the unit's service life. The ball bearing design also allows the supercharger to reach operating efficiency more quickly, which matters during track sessions where consistent performance is essential.

Compact Housing Dimensions

The GTX 2867R measures approximately 6.5 inches in overall length with a compressor inlet diameter of 3 inches and an outlet diameter of 2 inches. These compact dimensions make it an excellent fit for the BRZ's tight engine bay, where space is at a premium. The supercharger mounts directly to a custom bracket that replaces the factory intake manifold, preserving the stock hood line and requiring no structural modifications to the vehicle.

Specification Garrett GTX 2867R
Compressor Wheel Diameter 61.4 mm inducer / 86.9 mm exducer
Maximum Flow Rate 52 lb/min
Maximum Boost Pressure 32 psi (limited by BRZ engine capacity)
Bearing System Dual ball bearing
Weight Approximately 14 pounds
Recommended Maximum Horsepower 400+ hp (with proper fuel system)

Performance Gains: What 350+ Horsepower Feels Like

The Garrett GTX 2867R supercharger transforms the BRZ from a momentum car into a genuine performance machine. At 8-10 psi of boost with proper tuning, owners consistently report wheel horsepower figures between 320 and 360, representing a gain of roughly 100-130 horsepower over stock. This power level dramatically changes the car's character while retaining the responsive throttle feel that makes the BRZ so engaging.

Acceleration Metrics

A properly tuned BRZ with the GTX 2867R supercharger achieves performance numbers that rival much more expensive sports cars:

  • 0-60 mph: 3.8 to 4.2 seconds, down from the stock 5.4 seconds
  • Quarter-mile: 12.2 to 12.8 seconds at 110-115 mph, compared to 14.2 seconds stock
  • 60-130 mph: Approximately 11 seconds, representing a dramatic improvement in top-end passing power
  • Lateral acceleration: Maintained or improved due to the supercharger's low mounting position preserving the center of gravity

Driving Character Transformation

Unlike turbocharger systems that introduce lag and require careful gear selection to keep the engine in the power band, the GTX 2867R supercharger delivers boost immediately off idle. The power curve mimics a larger naturally aspirated engine, with linear delivery that builds smoothly to redline. This characteristic makes the car easier to drive at the limit and more predictable during corner exits, a critical advantage for track driving.

Comparison: Supercharger vs. Turbocharger for the BRZ

Before committing to the GTX 2867R supercharger, it is worth understanding how it compares to turbocharger alternatives for the BRZ platform. Each approach has distinct trade-offs that affect driving experience, installation complexity, and maintenance requirements.

Supercharger Advantages

  • Instant response: No turbo lag means power is available immediately when you press the throttle
  • Linear power delivery: The power curve feels natural and predictable, making the car easier to drive at the limit
  • Simpler installation: No need to route exhaust gases or install an intercooler, reducing complexity
  • Lower heat generation: Superchargers generate less under-hood heat than turbochargers, reducing thermal stress on engine components
  • Lighter overall system: The supercharger unit and brackets typically weigh less than a complete turbo system with intercooler and piping

Turbocharger Advantages

  • Higher peak power potential: Turbo systems can exceed 500 horsepower with proper supporting modifications
  • Better fuel efficiency at cruise: Turbochargers create less parasitic loss when not in boost
  • More tuning flexibility: Turbo systems allow for more aggressive boost curves and higher top-end power

For most street and track day enthusiasts, the GTX 2867R supercharger offers the better overall package. The instant response and linear power delivery make the car more enjoyable in real-world driving conditions, while the 350+ horsepower ceiling is more than adequate for all but the most serious competitors. Garrett's GTX technology has been rigorously tested across multiple platforms, giving owners confidence in the system's durability.

Installation: What to Expect

Installing the Garrett GTX 2867R supercharger on a BRZ requires mechanical competence but is within reach of experienced DIY enthusiasts. Most professional shops complete the installation in 8-12 labor hours, though first-time installers should budget for a full weekend.

Required Tools and Equipment

  • Complete socket set with 8mm through 19mm sockets
  • Torque wrench accurate to 20-100 ft-lb
  • Pry bar and trim removal tools
  • Coolant bleeding funnel
  • Vehicle lift or heavy-duty jack stands
  • Shop vacuum for debris removal
  • Thread locker and anti-seize compound

Major Installation Steps

The installation procedure follows a logical sequence that prioritizes access and cleanliness:

  1. Disconnect the battery and drain the cooling system. The supercharger replaces the factory intake manifold, requiring coolant line disconnection.
  2. Remove the factory intake system including the air box, intake tube, and mass airflow sensor housing. Store these components carefully if you wish to retain the ability to return to stock.
  3. Remove the factory intake manifold after disconnecting the throttle body, fuel injectors, and vacuum lines. This step provides access to the cylinder head mounting points.
  4. Install the supercharger mounting bracket using the provided hardware. Torque all bolts to manufacturer specifications, typically 35-45 ft-lb for M10 fasteners.
  5. Transfer the throttle body and fuel injectors to the new supercharger intake manifold. Use new gaskets to prevent vacuum leaks.
  6. Mount the supercharger unit to the bracket and connect the drive belt. The belt routing should follow the included diagram exactly to maintain proper tension.
  7. Connect all coolant lines, vacuum hoses, and electrical connections. Pay careful attention to the bypass valve vacuum line, as incorrect routing will cause idle issues.
  8. Reinstall the factory air box or aftermarket intake and connect the supercharger inlet tube.
  9. Refill the cooling system, reconnect the battery, and perform a leak check. Pressurize the intake system to 5 psi and listen for hissing.
  10. Priming and first start: Crank the engine with the fuel pump fuse removed for 10 seconds to build oil pressure before attempting to start.

Common Installation Challenges

Several aspects of the installation require special attention. The coolant lines that route through the supercharger manifold must be oriented correctly to prevent kinking. The drive belt tensioner must be adjusted to the proper specification, typically requiring 0.25-0.50 inches of belt deflection at the longest span. Finally, the throttle body position sensor may need recalibration after relocation to the new manifold.

Tuning: Unlocking the Full Potential

Installation is only half the equation. Proper tuning is essential for achieving the 350+ horsepower target while maintaining engine reliability. The BRZ's ECU must be reprogrammed to accommodate the increased airflow and fuel requirements, and this process demands a tuner familiar with forced induction Subaru boxer engines.

Fuel System Requirements

At the 350 horsepower level, the stock fuel system reaches its limits. Most tuners recommend upgrading the fuel pump to a Walbro 255 or 450 lph unit, along with higher flow fuel injectors in the 750-1000 cc range. The stock fuel pressure regulator may also require replacement to maintain consistent pressure under boost. Without these upgrades, the engine risks running lean, which can cause detonation and catastrophic failure.

ECU Tuning Options

  • OpenFlash Tablet: A popular choice for BRZ owners, offering pre-loaded calibration files and data logging capability. The off-the-shelf tune provided with the GTX 2867R kit is conservative but safe.
  • ECUtek: The professional standard for Subaru tuning, offering advanced features like variable cam timing adjustment, launch control, and flex fuel compatibility. Most high-horsepower builds use ECUtek.
  • ECU reflash by a professional tuner: The safest option for street cars. Custom tuning accounts for local fuel quality, altitude, and driving habits, resulting in a calibration that maximizes power without exceeding safe limits.
  • Standalone ECU (Motec, Haltech, Link): Necessary for extreme builds exceeding 400 horsepower. Standalone systems offer complete control over every engine parameter but require extensive tuning expertise.

Dyno Tuning Process

A professional dyno tuning session for the GTX 2867R supercharger typically requires 3-5 hours on a chassis dynamometer. The tuner will begin with a baseline pull to establish the car's pre-boost power, then gradually increase boost while monitoring air-fuel ratio, ignition timing, and knock activity. The target air-fuel ratio for a pump gas BRZ is typically 11.5-12.0:1 under full boost, with ignition timing set conservatively to prevent detonation on 91-93 octane fuel. ECUtek's support for the latest BRZ models has made professional tuning more accessible than ever for this platform.

Reliability Considerations for High-Horsepower BRZ Builds

The BRZ's FA24 engine is robust but has known weak points that become critical at elevated power levels. Understanding these limitations helps owners make informed decisions about boost levels and supporting modifications.

Engine Oil System

Under high lateral loads, the FA24's oil pickup can uncover, leading to oil starvation and bearing failure. This issue is exacerbated by the increased power output from supercharging. Upgrading to a high-flow oil pickup tube and baffled oil pan is strongly recommended for track use. Additionally, using a high-quality 5W-30 or 0W-40 synthetic oil and changing it at 3,000-mile intervals will help protect the engine.

Cooling System

The supercharger generates additional heat, especially during extended track sessions. Upgrading to a larger radiator (such as the Koyo or CSF units) and using a higher-flow water pump helps maintain stable coolant temperatures. Some owners also install an oil cooler to keep engine oil temperatures below 250 degrees Fahrenheit, which is the threshold where oil begins to break down under sustained load.

Transmission and Clutch

The stock BRZ clutch begins to slip at approximately 300 wheel horsepower, making a clutch upgrade essential for 350+ horsepower builds. The Exedy Stage 1 or Stage 2 clutch kit handles the power reliably while maintaining decent pedal feel for daily driving. The six-speed manual transmission is generally durable at this power level, though owners who frequently launch the car should consider upgrading the transmission mount and differential bushings to prevent driveline shunt.

Real-World Testing: Track and Street Validation

The Garrett GTX 2867R supercharger has been tested extensively by the Subaru performance community. Several independent shops have published dyno results and track data confirming the system's performance claims. On a Mustang dynamometer, which reads lower than Dynojet units, a typical BRZ equipped with the GTX 2867R, full exhaust, and proper tuning makes 330-350 wheel horsepower on 93 octane pump gas. With ethanol blends such as E85, the same setup achieves 370-390 wheel horsepower, as the fuel's higher octane allows more aggressive timing and boost.

Track testing at venues like Willow Springs, Road Atlanta, and Buttonwillow has confirmed that the supercharged BRZ can maintain consistent lap times throughout a 20-minute session without experiencing heat soak or power loss. The key to this consistency is the system's efficient intercooling design, which uses a air-to-water charge cooler integrated into the intake manifold to maintain intake air temperatures within 20 degrees of ambient under sustained load. Garrett's supercharger performance catalog provides additional data on compressor maps and efficiency ranges.

Cost Analysis and Budget Planning

A complete Garrett GTX 2867R supercharger conversion requires a realistic budget that accounts for all necessary components, not just the supercharger kit itself. Here is a breakdown of the typical costs involved:

Component Estimated Cost
Garrett GTX 2867R supercharger kit $5,500 - $6,500
Fuel pump upgrade (Walbro 450) $150 - $250
Fuel injectors (750-1000 cc) $400 - $600
Professional tuning session $500 - $1,000
Clutch upgrade $600 - $1,200
Oil cooler and radiator upgrade (optional) $800 - $1,500
Labor (if professionally installed) $1,200 - $2,000
Total estimated cost $9,150 - $13,050

While the investment is significant, it transforms the BRZ into a car that outperforms vehicles costing two to three times as much. The supercharger also retains resale value well, and many owners recoup a substantial portion of their investment if they sell the car with the system installed.

Maintenance and Long-Term Ownership

The GTX 2867R supercharger requires minimal ongoing maintenance beyond what a stock BRZ demands. The ball bearing cartridge is sealed and lubricated for life, eliminating the need for periodic servicing. The drive belt should be inspected at every oil change and replaced if any cracking or glazing is evident. Typical belt life is 30,000-50,000 miles depending on driving conditions.

The air filter should be cleaned or replaced at 15,000-mile intervals, and the charge cooler system should be flushed every two years to prevent coolant degradation. Beyond these basic tasks, the supercharger system is remarkably trouble-free in daily use. Subaru's factory maintenance schedule for the BRZ remains applicable, with the addition of the supercharger-specific checks.

Making the Decision: Is the GTX 2867R Right for You?

The Garrett GTX 2867R supercharger occupies a specific niche in the BRZ aftermarket. It targets owners who want a substantial power increase without sacrificing the car's essential character. The system delivers instant response, linear power, and a broad torque curve that makes the car faster everywhere without requiring constant gear changes to keep the engine on boost.

Owners who prioritize ultimate power numbers or plan to compete in classes that allow turbochargers may prefer a turbo system despite the additional complexity. However, for a street car that sees occasional track days, the GTX 2867R supercharger represents the best balance of power, drivability, and reliability available for the BRZ platform. The system's 350+ horsepower output is genuine and usable, transforming the BRZ from a car that looks fast into one that genuinely is fast.

The combination of Garrett's engineering reputation, the BRZ's excellent chassis, and the supercharger's linear power delivery creates a package that exceeds the sum of its parts. For enthusiasts seeking to unlock their BRZ's full potential while maintaining the qualities that made them choose the car in the first place, the Garrett GTX 2867R supercharger is a proven path to an exhilarating driving experience.