HKS FA24 Stroker Kit

2022–2026 Toyota GR86 / 2022–2026 Subaru BRZ

21004-AT009

Overview:

The HKS FA24 Stroker Kit is a precision-engineered 2.5L high compression upgrade designed exclusively for the FA24 engine found in the 2022 and newer Toyota GR86 and Subaru BRZ models. Developed through extensive testing in competitive environments such as D1 Drift and time attack at Tsukuba Circuit, this kit enhances engine displacement and strength, making it ideal for enthusiasts looking to boost performance, especially when adding forced induction like a supercharger.

Crafted with meticulous attention to detail and "Made in Japan" quality standards, the kit delivers improved durability and power potential while maintaining reliability. It is perfect for performance enthusiasts seeking a robust internal upgrade that supports higher output without compromising engine integrity.

Key Features:

This stroker kit incorporates advanced materials and design innovations to optimize engine performance and durability:

• Piston Kit: Uses high-temperature resistant A2618 material to prevent second land breakage and achieves a low pin height, eliminating the need for service holes.
• Dual-layer molybdenum coating on pistons reduces friction for enhanced efficiency and longevity.
• Specially designed piston head cavity optimizes direct injection atomization for improved combustion.
• 3D piston crown shape sustains tumble flow, enhancing air-fuel mixture and combustion stability.
• Uneven piston head shape allows compatibility with high-lift camshafts for increased valve timing flexibility.
• Connecting Rods: Exclusive billet connecting rods engineered for the longer stroke, featuring a dedicated crank pin size that requires no engine block modifications.
• High-strength split-type I-beam design with optimized bolt size and wall thickness, achieving approximately 30% strength increase while minimizing weight gain.
• Manufactured from chrome-molybdenum steel with advanced heat treatment and shot peening to improve fatigue strength and toughness.
• Crankshaft: Forged construction with dedicated pin journal size, designed to work seamlessly with the HKS connecting rods for optimal performance and reliability.

Construction & Design:

The HKS FA24 Stroker Kit is the result of detailed analysis and experimentation tailored specifically for the FA24 engine platform. The pistons and connecting rods are crafted from premium materials chosen for their strength and thermal resistance, ensuring durability under high-stress conditions. The billet manufacturing process allows for ideal thickness shaping and eliminates weak points, while the shot peening surface treatment enhances fatigue resistance.

Each component is engineered to fit precisely without requiring modifications to the engine block, making installation straightforward for experienced builders. The design also supports the use of high-lift camshafts, allowing further tuning flexibility.

Installation & Fitment:

This stroker kit is designed as a direct upgrade for the 2022 to 2026 Toyota GR86 and Subaru BRZ equipped with the FA24 engine. Thanks to the dedicated crank pin sizing and optimized connecting rods, no clearance modifications to the stock engine block are necessary. This ensures a cleaner installation process and preserves engine integrity.

While professional installation and engine tuning are recommended to maximize performance and reliability, the kit’s design minimizes the need for additional machining or custom modifications.

• Direct fit for 2022–2026 Toyota GR86 and Subaru BRZ FA24 engines
• No engine block clearance modifications required
• Recommended for use with HKS connecting rods and forged crankshaft

What's Included:

• High-compression forged pistons with molybdenum coating
• Billet high-strength connecting rods optimized for longer stroke
• Forged crankshaft with dedicated pin journal size
• All necessary hardware for assembly

Ideal For:

The HKS FA24 Stroker Kit is ideal for performance enthusiasts and professional tuners who want to increase engine displacement and strength in their Toyota GR86 or Subaru BRZ. It is especially suited for those planning to install forced induction systems such as superchargers or turbochargers, as it provides the internal durability required to handle increased power levels.

• Track and time attack drivers seeking reliable power upgrades
• D1 Drift competitors and motorsport enthusiasts
• Owners looking to enhance engine strength without extensive block modifications
• Builders aiming for high-lift camshaft compatibility and advanced tuning options