Ferrea Single Spring Kit

2013–2016 Scion FR-S / 2013–2020 Subaru BRZ / 2017–2020 Toyota 86

KT4021

Overview:

The Ferrea Single Spring Kit is a high-quality valve spring upgrade designed specifically for the Scion FR-S (2013–2016), Subaru BRZ (2013–2020), and Toyota 86 (2017–2020). This kit is engineered to enhance the valvetrain performance of your vehicle’s naturally aspirated engine, providing improved durability and reliability under spirited driving conditions.

Ideal for enthusiasts who demand better valve control during aggressive driving or mild performance modifications, this spring kit helps maintain consistent valve timing and reduces the risk of valve float at higher RPMs. Whether you are upgrading for track use, spirited street driving, or simply to improve engine responsiveness, the Ferrea Single Spring Kit offers a dependable solution.

Key Features:

This single spring kit is crafted with precision and performance in mind. Key features include:

• Manufactured by Ferrea, a trusted name in high-performance valvetrain components.
• Designed to fit the 2013–2016 Scion FR-S, 2013–2020 Subaru BRZ, and 2017–2020 Toyota 86 models perfectly.
• Single spring configuration optimized for improved valve control and reduced valve float.
• Constructed from high-quality spring steel for enhanced strength and longevity.
• Supports increased RPM limits and aggressive camshaft profiles without compromising reliability.
• Precision wound to maintain consistent spring pressure and valve seating force.
• Ideal for enthusiasts upgrading their engine’s valvetrain for better performance and durability.

Construction & Design:

The Ferrea Single Spring Kit is engineered using premium spring steel that undergoes rigorous heat treatment processes to ensure maximum strength and fatigue resistance. Each spring is precision wound to exact specifications, ensuring consistent spring rates and reliable valve seating force throughout its service life.

This kit’s design focuses on maintaining optimal valve control at elevated engine speeds, reducing the risk of valve float and improving overall engine responsiveness. The springs are designed to fit directly onto the factory valve seats and retainers, ensuring a straightforward installation without the need for additional modifications.

Installation & Fitment:

The Ferrea Single Spring Kit is a direct fit replacement for the stock valve springs on the specified Scion FR-S, Subaru BRZ, and Toyota 86 models. Installation requires standard valvetrain disassembly and reassembly procedures, typically performed by experienced technicians or knowledgeable enthusiasts.

No cutting, drilling, or special tuning is required when installing this kit. It is designed to work seamlessly with the factory valvetrain components, making it an excellent upgrade for those seeking improved valve spring performance without extensive modifications.

• Direct fit for 2013–2016 Scion FR-S, 2013–2020 Subaru BRZ, and 2017–2020 Toyota 86.
• Compatible with factory valve retainers and seats.
• No special tuning or machining required.

What's Included:

• Complete set of Ferrea single valve springs for all cylinders.
• Installation instructions to guide proper fitting and torque specifications.

Ideal For:

This spring kit is perfect for:

• Performance enthusiasts upgrading their naturally aspirated FA20 engines.
• Drivers seeking improved valve control for spirited street driving or occasional track use.
• Owners planning mild to moderate camshaft upgrades requiring stronger valve springs.
• Anyone looking to enhance engine reliability and reduce valve float at higher RPMs.

Ferrea manufactures racing engine valves and valvetrain components developed with input from high-level motorsport and engine builders. Known for advanced materials and precise manufacturing, Ferrea parts are commonly chosen for high-RPM, high-boost, and endurance-focused builds where valvetrain stability and reliability are critical.