Ferrea Dual Spring Kit

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

KT4022

Overview:

The Ferrea Dual Spring Kit is a precision-engineered valve spring upgrade designed specifically for the Scion FR-S (2013–2016), Subaru BRZ (2013–2020), and Toyota 86 (2017–2020). This kit is ideal for enthusiasts seeking enhanced valvetrain stability and durability, especially under high RPM and performance driving conditions. Whether you are tuning your vehicle for spirited street driving or track use, this dual spring setup helps maintain optimal valve control, reducing the risk of valve float and improving overall engine responsiveness.

Crafted by Ferrea, a trusted name in high-performance valvetrain components, this kit offers a reliable upgrade over the factory springs, supporting increased power levels and aggressive cam profiles without compromising reliability.

Key Features:

The Ferrea Dual Spring Kit combines advanced engineering and high-quality materials to deliver superior performance and durability. Key features include:

• Dual spring design enhances valve control and reduces valve float at high RPMs.
• Manufactured from premium spring steel for long-lasting strength and fatigue resistance.
• Precision wound and heat-treated to maintain consistent spring rates and performance.
• Designed to fit OEM valve seats and retainers without modification.
• Improves valvetrain stability for aggressive camshaft profiles and higher engine speeds.
• Compatible with stock and aftermarket valvetrain components for versatile tuning options.
• Supports enhanced throttle response and overall engine efficiency.

Construction & Design:

Ferrea’s Dual Spring Kit is engineered with a focus on durability and performance. The dual spring configuration uses two concentric springs that work together to provide a progressive spring rate, which helps maintain valve control throughout the entire RPM range. The springs are crafted from high-grade steel and undergo rigorous heat treatment processes to ensure optimal strength and resistance to fatigue.

This design reduces the likelihood of valve bounce and float, common issues in high-performance or modified engines running aggressive camshafts or elevated RPMs. The springs are designed for direct fitment, maintaining factory valve seat compatibility and ensuring a straightforward installation process.

Installation & Fitment:

The Ferrea Dual Spring Kit is a direct replacement for the factory valve springs on the following vehicles:

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

Installation requires standard valvetrain disassembly and reassembly procedures. No special modifications, cutting, or drilling are necessary. This kit is designed to work seamlessly with OEM valve retainers and keepers, making it suitable for both stock and modified engines.

What’s Included

• Complete set of dual valve springs for all cylinders
• Installation instructions

Ideal For:

This dual spring kit is perfect for:

• Performance enthusiasts upgrading camshafts or increasing engine RPM limits
• Track and autocross drivers seeking improved valvetrain reliability
• Owners looking to enhance throttle response and engine durability
• Anyone requiring a reliable valve spring upgrade for their Scion FR-S, Subaru BRZ, or Toyota 86

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.