Best Supercharger Sizes for the Toyota GR86: 50, 60, and 70 HP Gains You Should Know

The Toyota GR86 has quickly become a favorite among driving purists, offering a lightweight chassis, precise steering, and a naturally aspirated 2.4-liter boxer engine that revs freely. Yet for many enthusiasts, the factory 228 horsepower leaves room for more excitement. One of the most effective and reliable ways to unlock the car’s potential is forced induction, specifically a supercharger. Unlike turbochargers, superchargers deliver immediate, linear power with no lag, preserving the GR86’s responsive character.

Selecting the right supercharger size is critical. Too small, and you may leave power on the table; too large, and you risk overwhelming the engine or requiring extensive supporting modifications. The most common power targets for the GR86 fall into three brackets: 50 hp, 60 hp, and 70 hp gains. Each offers a different balance of performance, daily drivability, and reliability. This guide breaks down what you can expect from each gain level, recommends real-world supercharger kits, and covers the factors you need to consider before making a decision.

Understanding Supercharger Sizes for the GR86

Supercharger sizing on the FA24D engine is typically determined by the compressor displacement, drive ratio, and boost pressure. The GR86’s engine bay can accommodate several supercharger types: centrifugal, roots, and twin-screw. Each type delivers power differently, but the horsepower gain is ultimately a product of airflow and boost.

For the three common gain targets—50 hp, 60 hp, and 70 hp—the supercharger kits generally produce 5-8 psi of boost, depending on pulley size and intercooling efficiency. The stock FA24 engine has strong internals and can handle this level of boost safely when properly tuned. However, each gain bracket comes with its own set of requirements, from fueling upgrades to cooling considerations. Let’s dive into each.

50 HP Gains: A Reliable Daily Driver Upgrade

Adding 50 horsepower to the GR86 brings total output to around 278 hp at the crank. This is a sweet spot for enthusiasts who want a noticeable improvement without the need for major engine modifications. The power increase transforms acceleration, making highway merging and overtaking effortless while retaining the car’s balance and predictability.

At this power level, the stock clutch, fuel system, and cooling system can typically handle the extra load without issue, especially if the car is driven primarily on the street. The supercharger operates at lower boost pressure (around 5-6 psi), which reduces heat buildup and stress on the drivetrain. The result is a car that feels significantly stronger but still behaves like a factory vehicle during daily commutes.

Driving Experience with 50 HP Gains

  • Responsive throttle: The supercharger delivers boost immediately, so there is no lag when you step on the gas.
  • Linear power delivery: Unlike a turbo, the power builds smoothly from low RPM to redline, making the car easier to control.
  • Minimal NVH increase: Many supercharger kits add only a subtle whine, keeping the cabin pleasant for daily driving.
  • Retained fuel economy: Under light throttle, the engine behaves almost like stock, so fuel consumption remains reasonable.

Several aftermarket manufacturers offer kits optimized for this power level. The most proven options include the Edelbrock E-Force Supercharger System, which uses a Roots-type design and includes an integrated air-to-water intercooler. It is commonly tuned to produce 275-280 hp on 91 octane fuel. Another strong candidate is the Jackson Racing C30-94 Centrifugal Supercharger Kit, known for its excellent fitment and CARB certification. With a conservative pulley, it reliably adds 50-55 hp while maintaining OE-level drivability. Finally, the HKS GT2 Supercharger Kit offers a twin-screw design that provides instant torque, ideal for drivers who prioritize low-end punch.

For those who prefer a complete, off-the-shelf solution, Edelbrock’s kit is available directly and includes everything needed for installation. Many owners report that a professional tune yields 275-280 hp on a stock engine, making this a worry-free entry into forced induction.

60 HP Gains: The Versatile Performance Upgrade

Stepping up to 60 horsepower brings the GR86 to roughly 288 hp. This is the most popular bracket among enthusiasts who want a meaningful track advantage without sacrificing daily usability. The extra 10 hp over the 50 hp tier comes from slightly higher boost (6-7 psi) and often a free-flowing intake or exhaust.

At this level, you’ll feel a more aggressive power curve, especially in the mid-range. The car accelerates harder when exiting corners, which translates to faster lap times and more engaging back-road fun. However, the increased boost means you should pay closer attention to supporting modifications. The stock fuel system may still be adequate, but an upgraded fuel pump or flex-fuel sensor for E85 compatibility is often recommended to ensure consistent fueling under high load.

Installation and Supporting Mods for 60 HP

To get the most out of a 60 hp supercharger kit, plan for these supporting modifications:

  • Oil cooler: The GR86’s FA24 runs hot on track. An oil cooler helps maintain safe oil temperatures during sustained high-RPM use.
  • Intercooler upgrade: If the supercharger kit uses an air-to-air intercooler, consider a larger core or a water-to-air setup for consistent intake temperatures.
  • Clutch upgrade: While the stock clutch can handle 60 hp gains for a while, repeated hard launches and track days will accelerate wear. A performance clutch disc and pressure plate add reliability.
  • ECU calibration: A custom tune from a trusted shop is essential. Many kits come with a base calibration, but a dyno tune will optimize power and safety.

Top Supercharger Options for 60 HP Gains

The Innovate Supercharger Systems SC-600 Kit targets this power level with a positive-displacement design that delivers strong torque from 2,500 rpm. It is often paired with an upgraded pulley for 7 psi of boost. Another excellent choice is the GReddy T3T Supercharger Kit, which uses a centrifugal compressor and a large air-to-air intercooler. With a proper tune, it can achieve 290 hp while maintaining a flat torque curve.

For those who want a plug-and-play option that doesn’t require a stand-alone ECU, the Jackson Racing Dual-Rotor Supercharger Kit is a robust choice. It includes a CARB-legal tune for 91 octane and has been extensively tested on the GR86 platform. Jackson Racing’s official page provides detailed dyno charts and installation guides.

70 HP Gains: Maximum Performance for Enthusiasts

Seventy horsepower from a supercharger pushes the GR86 well past 300 hp, often landing at 305-310 crank horsepower. This is a transformative power level that elevates the car into serious sports car territory. At 7-8 psi of boost, the FA24 engine is nearing the safe limit for stock internals with pump gas. For this reason, the 70 hp bracket is best suited for experienced owners who understand the trade-offs and are willing to invest in comprehensive supporting modifications.

On the track, the extra power makes a dramatic difference. The GR86 can keep pace with cars like the Porsche Cayman S or BMW M2 on straights, while still using its lightweight agility to gain time in corners. However, this level of performance demands a higher level of maintenance, regular oil analysis, and a vigilant eye on engine health.

Critical Supporting Modifications for 70 HP Gains

If you target 70 hp, plan for the following upgrades to ensure reliability:

  • Fuel system upgrade: High-impedance injectors and a larger fuel pump are mandatory. The stock injectors run out of duty cycle above 300 hp.
  • ECU tuning with flex fuel: E85 fuel provides additional knock resistance, allowing more aggressive timing and boost. Many 70 hp kits include a flex-fuel sensor and tune.
  • Internal engine reinforcement: While the FA24 has strong connecting rods and pistons, some owners opt for forged internals for peace of mind, especially if they plan to push beyond 300 hp.
  • Upgraded brakes and suspension: With more power, you’ll reach higher speeds before corners. Upgraded brake pads, rotors, and coilovers are recommended.
  • Clutch and flywheel: A heavy-duty clutch kit is essential. A lighter flywheel helps the engine rev more freely, complementing the supercharger’s responsiveness.

Best Supercharger Choices for 70 HP Gains

The HKS GT2 Supercharger Kit with Large Pulley is a top contender for this power level. HKS’s twin-screw design provides incredible mid-range torque, and with the larger pulley, it pushes 8 psi safely. Another proven option is the Edelbrock E-Force Stage 2 Kit, which includes a high-flow intake manifold, larger throttle body, and a high-boost pulley. With a proper tune on E85, it produces over 310 hp. The Harrop HTV1320 Supercharger Kit is also gaining popularity. Originally developed for the Subaru BRZ, it is adapted for the GR86 and features a large twin-screw rotor pack that delivers excellent airflow with minimal heat soak.

To see real-world data and owner experiences with these kits, check out the FT86Club forced induction forum, which has extensive build threads and dyno results.

Factors to Consider When Choosing a Supercharger

Beyond the power gain, several factors should influence your decision. The right choice depends on your driving style, budget, and long-term plans for the car.

  • Driving environment: If you drive mostly in stop-and-go traffic, a roots or twin-screw supercharger provides instant low-end torque. For track-focused driving with high rpm usage, a centrifugal supercharger offers top-end rush and cooler charge air.
  • Installation complexity: Some kits are designed for DIY installation with minimal modification (e.g., Edelbrock, Jackson Racing), while others require cutting the intake or modifying engine mounts. Check the included instructions and required tools.
  • Emissions compliance: If you live in California or other states with strict smog laws, look for CARB-approved kits. Jackson Racing and Edelbrock both offer CARB-legal options.
  • Future upgrade path: Think about your long-term horsepower goals. If you may want to increase boost later, choose a supercharger with interchangeable pulleys and a flexible tuning platform (e.g., ECUtek or Motec).
  • Budget for total cost: The supercharger kit itself often costs between $4,000 and $6,500, but installation, tuning, and supporting mods can double that figure. Plan your finances accordingly.

Comparing Power Gains and Supporting Mods at a Glance

The following breakdown helps you quickly understand what each power level requires:

  • 50 HP gain: Minimal supporting mods. Stock clutch, fuel system, and cooling are sufficient. Best for daily drivers and first-time modifiers.
  • 60 HP gain: Requires oil cooler and upgraded clutch for sustained track use. Fuel system may need minor upgrades for E85. A custom tune is recommended for maximum reliability.
  • 70 HP gain: Needs full fuel system upgrade, ECU tune with flex fuel, and likely a built engine for peace of mind. Clutch, brakes, and suspension must be upgraded. This level is for dedicated enthusiasts.

Installation and Tuning: Getting It Right

No matter which supercharger size you choose, proper installation and tuning are non-negotiable. A poorly installed supercharger can lead to belt slip, boost leaks, or oil starvation. Always use a torque wrench and follow the manufacturer’s torque specs. Many kits include silicone couplers and T-bolt clamps that require periodic inspection.

Tuning should be performed by a professional with experience on the FA24 platform. A simple flash tune might be adequate for a 50 hp kit, but for 60-70 hp gains, a dyno tune that adjusts fuel, timing, and boost targeting is essential. Some tuners specialize in GR86 and BRZ engines; checking Delicious Tuning for their custom calibration services can be a good starting point.

After installation, break in the supercharger with a few hundred miles of mixed driving before full-throttle runs. This allows the belts, seals, and bearings to seat properly. Monitor oil temperature and knock levels on your first few track sessions.

Maintaining Your Supercharged GR86

A supercharged vehicle requires slightly more attention than a stock one. Follow these maintenance tips to keep your GR86 running reliably:

  • Change oil more frequently: Every 3,000-4,000 miles with a high-quality synthetic oil (5W-30 or 10W-40 depending on climate).
  • Clean the intercooler core: Road debris can clog air-to-air intercoolers. Use a gentle stream of water and a soft brush.
  • Inspect the drive belt: Check for cracks and tension every oil change. Replace annually.
  • Check engine mounts: Under higher torque, stock mounts may shift. Consider upgraded polyurethane mounts.
  • Log engine data: Use a device like the ECUtek Bluetooth module or a standalone logger to track boost, AFR, and timing. This helps catch issues early.

Conclusion

The Toyota GR86 is an exceptional canvas for forced induction. Whether you choose a 50 hp gain for a lively daily driver, a 60 hp gain for balanced track and street performance, or a 70 hp gain for maximum thrills, a supercharger will transform the car’s character. Each power level has its own set of requirements and rewards. Assess your goals, budget, and willingness to invest in supporting modifications, then select the kit that aligns with your vision. With the right supercharger and proper preparation, your GR86 will deliver an exhilarating driving experience that few other cars at any price can match.