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The Subaru WRX is a beloved platform for performance enthusiasts, especially those looking to push their vehicles beyond the factory limits. When aiming for a 600+ horsepower build, the choice of aftermarket internals becomes critical. This article will explore the best options for pistons, rods, and head studs that can withstand the demands of high horsepower applications.
Pistons for 600+ HP WRX Builds
Choosing the right pistons is essential for achieving the desired power levels while maintaining engine reliability. Here are some of the top aftermarket options:
- CP Pistons: Known for their durability and performance, CP Pistons offer various compression ratios suitable for high boost applications.
- Wiseco Pistons: These forged pistons are designed for extreme conditions, providing excellent thermal stability and strength.
- Manley Pistons: Manley offers a range of pistons made from high-quality materials, ensuring they can handle the stress of a built engine.
Key Features to Consider
When selecting pistons, keep the following features in mind:
- Material: Look for forged aluminum for strength and weight savings.
- Compression Ratio: Choose a ratio that suits your fuel and boost setup.
- Coating: Consider options with thermal barrier coatings for improved performance.
Rods for High Power Applications
Connecting rods are another critical component in a high horsepower build. They must be able to handle the increased forces generated by a powerful engine. Here are some recommended aftermarket rods:
- Manley H-Beam Rods: These rods are known for their strength and reliability, making them a popular choice for high horsepower builds.
- CP Carrillo Rods: Featuring a unique design, these rods provide exceptional strength and weight savings.
- GRP Rods: Known for their lightweight construction and high strength, GRP rods are ideal for racing applications.
Choosing the Right Rods
Consider the following when selecting connecting rods:
- Material: Look for rods made from high-strength steel or aluminum.
- Design: H-beam or I-beam designs have different strengths and weights.
- Length: Ensure the rod length is compatible with your piston and crankshaft setup.
Head Studs for Increased Reliability
When building an engine for high horsepower, using upgraded head studs is crucial for maintaining cylinder head integrity under boost. Here are some top choices:
- ARP Head Studs: ARP is a trusted name in performance fasteners, offering head studs that provide superior clamping force.
- Brian Crower Head Studs: Known for their high tensile strength, these studs are designed for extreme applications.
- OEM Subaru Head Studs: While not aftermarket, using OEM studs ensures proper fitment and reliability for moderate builds.
Factors to Consider When Choosing Head Studs
Keep these factors in mind when selecting head studs:
- Tensile Strength: Look for studs with a high tensile strength rating to withstand boost pressure.
- Thread Size: Ensure compatibility with your engine’s cylinder head.
- Material: Choose studs made from high-quality steel for maximum reliability.
Conclusion
Building a WRX engine capable of producing 600+ horsepower requires careful selection of aftermarket internals. By investing in high-quality pistons, rods, and head studs, you can ensure your engine withstands the rigors of high-performance driving. Always consult with a professional to ensure compatibility and reliability in your build.