BoostLine Forged Connecting Rod Set Ford 2.3 EcoBoost Focus RS & Mustang – FD5866-886

BoostLine FD5866-886 Forged Connecting Rod Set – Ford 2.3L EcoBoost

Take your Ford EcoBoost engine build to the next level with the BoostLine FD5866-886 Connecting Rod Set.

Designed specifically for demanding forced-induction applications, these heavy-duty forged connecting rods are an excellent upgrade for modified 2.3L EcoBoost engines found in performance models including the Ford Focus RS Mk3 and Ford Mustang EcoBoost.

BoostLine connecting rods are manufactured from premium 4340 forged steel and utilise the company’s distinctive patented three-pocket beam design. The design combines high structural strength with carefully controlled rotating mass, making the rods particularly suitable for powerful turbocharged engine builds.

Built for High-Performance EcoBoost Engines

The factory 2.3 EcoBoost engine offers significant tuning potential, but increasing boost pressure and cylinder pressure places considerably greater loads on the connecting rods.

Installing upgraded forged connecting rods is therefore an important consideration when building an engine for:

• Upgraded turbocharger installations
• Increased boost pressure
• High-performance road use
• Track and competition use
• Forged engine builds
• High-output EcoBoost projects
• Motorsport applications

The FD5866-886 set provides a strong foundation for performance engine builds where durability and reliability under increased cylinder pressure are priorities.

Premium Forged 4340 Steel Construction

Each BoostLine connecting rod is manufactured from premium forged 4340 steel, a material widely used in high-performance engine components because of its strength and fatigue resistance.

Rather than using a conventional H-beam construction, BoostLine developed its distinctive three-pocket beam profile specifically for high-load performance engines.

BoostLine states that this patented construction provides approximately 60% greater bending strength compared with a comparable H-beam rod, helping the rods cope with the extreme loads generated by highly tuned turbocharged engines.

ARP 2000 Connecting Rod Bolts

The FD5866-886 version is supplied with high-quality 3/8-inch ARP 2000 rod bolts.

ARP fasteners are widely used throughout motorsport and performance engine building because connecting rod bolts are among the most highly stressed fasteners inside an engine.

For even more extreme applications, BoostLine also produces an ARP Custom Age 625+ version under a different part number. FD5866-886 is the ARP 2000 specification.

Precision Engineered for the Ford 2.3 EcoBoost

BoostLine designed this connecting rod specifically around the Ford 2.3L EcoBoost engine dimensions.

Technical Specifications

Manufacturer: BoostLine
Manufacturer Part Number: FD5866-886
Product Type: Forged Connecting Rod Set
Engine Application: Ford 2.3L EcoBoost
Number of Rods: 4
Material: Forged 4340 Steel
Rod Design: BoostLine Three-Pocket / I-Beam Style
Centre-to-Centre Length: 5.866″ / approx. 149.0–149.23 mm
Piston Pin Diameter: 0.886″ / 22.50 mm
Journal Size: 50.00 mm
Housing Bore: 55.028 mm
Big-End Width: 21.82 mm
Small-End Width: 21.82 mm
Rod Bolt Diameter: 3/8″
Rod Bolts: ARP 2000
Quantity: Set of 4

Vehicle Applications

Suitable for compatible Ford 2.3L EcoBoost engines, including:

Ford Focus RS Mk3

• 2.3L EcoBoost
• Turbocharged 4-cylinder petrol
• 2016–2018

Ford Mustang EcoBoost

• 2.3L EcoBoost
• Turbocharged 4-cylinder petrol
• 2015–2023 applications

Always confirm engine specification and component dimensions before ordering, particularly on vehicles with replacement or previously modified engines.

Why Choose BoostLine Connecting Rods?

BoostLine connecting rods are designed specifically for engines operating well beyond standard factory power levels.

Key advantages include:

• Premium forged 4340 steel construction
• Patented three-pocket beam design
• Designed for high-boost forced-induction engines
• Increased bending strength compared with conventional H-beam designs
• ARP 2000 rod bolts included
• Precision machined engine dimensions
• Complete matched set of four connecting rods
• Ideal for forged Ford EcoBoost engine builds
• Suitable for fast-road, track and motorsport projects

Ideal Upgrade for Focus RS Mk3 Builds

The Ford Focus RS Mk3 2.3 EcoBoost responds extremely well to tuning, making forged internal components particularly desirable when building engines intended to operate beyond factory performance levels.

Combining BoostLine forged rods with appropriate forged pistons, bearings, engine management and supporting modifications can provide a strong internal foundation for serious Focus RS performance builds.

Ideal for Mustang 2.3 EcoBoost Performance Builds

The Ford Mustang 2.3 EcoBoost shares the high-performance turbocharged EcoBoost architecture and offers considerable tuning potential.

For owners undertaking a forged engine build, the BoostLine FD5866-886 connecting rods provide a performance-focused replacement for the original connecting rods and are suitable for applications involving upgraded turbochargers and increased cylinder pressures.

What’s Included?

• 4 × BoostLine forged connecting rods
• ARP 2000 connecting rod bolts

Important Installation Information

Professional engine assembly is recommended.

Connecting rod installation should be carried out by a competent performance engine builder. Bearing clearances, crankshaft condition, piston compatibility, fastener torque, rod clearances and overall rotating assembly specification should be checked during assembly.