Subaru BRZ/Scion FR-S Turbo: Top Speed & Performance

The Subaru BRZ and Scion FR-S, known as the Toyota GT86 in some markets, are celebrated for their agile handling and driver-focused experience. However, their modest horsepower often leaves enthusiasts wondering about their top speed potential, especially when considering turbocharger modifications. Guys, let's dive into the world of BRZ/FR-S turbo upgrades and explore how they impact the top speed and overall performance of these beloved sports cars.

Understanding the Stock Top Speed

Before we get into the exciting realm of turbocharging, let's establish a baseline by examining the stock top speed of the Subaru BRZ and Scion FR-S. From the factory, these cars are equipped with a naturally aspirated 2.0-liter four-cylinder engine, which produces around 200 horsepower and 151 lb-ft of torque. This power is sent to the rear wheels through either a six-speed manual or a six-speed automatic transmission.

The stock top speed of the BRZ/FR-S is typically around 134-140 mph (215-225 km/h), depending on factors such as the car's condition, road conditions, and any minor modifications. While this speed is respectable for a sports car in its class, it's not exactly mind-blowing. The BRZ/FR-S is more about the driving experience – the way it handles corners, the feedback you get from the road, and the overall sense of connection with the car. The focus was more on handling and balance, rather than outright straight-line speed.

However, for those who crave more power and a higher top speed, the aftermarket industry offers a plethora of solutions, with turbocharger kits being among the most popular. These kits can dramatically increase the horsepower and torque of the BRZ/FR-S, unlocking a whole new level of performance. But it’s crucial to understand that installing a turbocharger is a significant modification that requires careful planning, professional installation, and proper tuning. Just slapping on a turbo without addressing other supporting components can lead to serious engine damage.

Furthermore, the stock top speed is often electronically limited by the manufacturer. This is done for various reasons, including tire safety and overall vehicle stability. When adding a turbocharger, it's essential to consider whether the electronic speed limiter needs to be adjusted or removed to fully realize the car's potential. This usually involves recalibrating the ECU (Engine Control Unit) with aftermarket tuning software.

The Impact of Turbocharging on Top Speed

So, how does adding a turbocharger affect the top speed of a Subaru BRZ or Scion FR-S? The answer, in short, is significantly. A well-designed and properly installed turbo kit can substantially increase horsepower and torque, which translates to a higher top speed and quicker acceleration. But, like everything in the automotive world, it's not quite that simple. Several factors come into play when determining the actual top speed achieved after turbocharging.

First and foremost, the size and type of turbocharger used play a crucial role. Smaller turbos provide quicker boost response at lower RPMs, which improves acceleration and drivability. Larger turbos, on the other hand, can deliver significantly more horsepower at higher RPMs, potentially leading to a higher top speed. However, larger turbos often suffer from turbo lag, which is a delay between when you hit the throttle and when the turbocharger starts producing boost. This can make the car feel sluggish at lower speeds.

The amount of boost that the turbocharger is running also directly impacts the top speed. Boost is essentially the amount of pressure that the turbocharger is forcing into the engine. Higher boost levels generally result in more horsepower and torque, but they also put more stress on the engine components. It's essential to ensure that the engine is properly built and reinforced to handle the increased boost levels. This may involve upgrading the pistons, connecting rods, and other internal components.

Engine management and tuning are also critical factors. The ECU needs to be properly calibrated to optimize the air-fuel ratio, ignition timing, and other parameters for the new turbocharger setup. A poorly tuned engine can result in reduced power, poor fuel economy, and even engine damage. It's highly recommended to have the car professionally tuned by a qualified tuner who specializes in BRZ/FR-S turbo setups.

Aerodynamics also play a role, especially at higher speeds. The BRZ/FR-S has a relatively aerodynamic shape from the factory, but there's always room for improvement. Adding aftermarket aerodynamic components, such as a front splitter, side skirts, and a rear wing, can help reduce drag and increase downforce, which can improve stability and potentially increase top speed. However, it's essential to choose aerodynamic components that are functional and well-designed. Cheap or poorly designed parts can actually decrease performance.

Finally, tire choice is crucial for achieving a higher top speed. High-performance tires with a high-speed rating are essential for ensuring safety and stability at high speeds. It's also important to choose tires that are appropriate for the driving conditions. For example, summer tires provide excellent grip on dry pavement, but they can be dangerous in wet or cold conditions.

Real-World Top Speed Examples After Turbo Installation

Alright, let's get to the good stuff. What kind of top speeds can you realistically expect to achieve after installing a turbocharger on your BRZ/FR-S? The answer, as you might have guessed, varies depending on the specific turbo kit, boost levels, supporting modifications, and tuning. However, we can provide some general examples based on real-world experiences.

With a moderate turbo kit running around 8-10 PSI of boost and proper tuning, you can typically expect to see a top speed increase of around 20-30 mph (32-48 km/h). This would put the top speed in the range of 155-170 mph (250-274 km/h). These kits often focus on improving overall drivability and providing a broader powerband, rather than solely maximizing top speed.

For those who are looking for more extreme performance, high-performance turbo kits are available that can run significantly higher boost levels. These kits often require extensive engine modifications and upgraded fuel systems to support the increased power. With these kits, it's possible to achieve top speeds in excess of 180 mph (290 km/h) or even higher. However, it's important to note that these setups are typically more expensive and require more maintenance.

Keep in mind that achieving these top speeds requires a suitable location, such as a racetrack or a closed course. Attempting to reach these speeds on public roads is extremely dangerous and illegal. Always prioritize safety and obey traffic laws.

It's also worth noting that some BRZ/FR-S owners have successfully swapped in more powerful engines, such as the Toyota 2JZ or the Nissan SR20DET. These swaps can result in even higher top speeds, but they are significantly more complex and expensive than simply installing a turbocharger.

Factors Affecting Top Speed

Numerous factors can affect the actual top speed achieved after turbocharging a BRZ or FR-S. Here are some of the most important considerations:

• Altitude: Higher altitudes mean less air density, which reduces the amount of power that the engine can produce. This can significantly impact top speed.
• Weather Conditions: Hot weather can also reduce engine power, while cold weather can increase it. Wind resistance can also play a significant role, especially at higher speeds.
• Road Conditions: A smooth, flat road is ideal for achieving maximum top speed. Bumpy or uneven roads can reduce speed and stability.
• Weight: The lighter the car, the faster it will be. Removing unnecessary weight can improve acceleration and top speed.
• Gear Ratios: The gear ratios in the transmission can affect the car's acceleration and top speed. Taller gear ratios are generally better for top speed, while shorter gear ratios are better for acceleration.
• Driver Skill: A skilled driver can extract more performance from the car than an inexperienced driver.

Conclusion

Adding a turbocharger to a Subaru BRZ or Scion FR-S can significantly increase its top speed and overall performance. However, it's essential to choose the right turbo kit, install it properly, and tune the engine correctly. It's also important to consider the other factors that can affect top speed, such as altitude, weather conditions, and road conditions. With careful planning and execution, you can transform your BRZ/FR-S into a seriously fast machine.

Ultimately, the decision of whether or not to turbocharge your BRZ/FR-S is a personal one. It depends on your budget, your goals, and your tolerance for risk. But if you're looking to unlock the full potential of your sports car, a turbocharger is definitely worth considering. Just remember to do your research, choose reputable parts, and seek professional help when needed. Drive safe and have fun!