Hardrace Adjustable Rear Upper Arm – Honda S2000 AP1 / AP2

Hardrace Adjustable Rear Upper Camber Arm – Honda S2000 AP1 / AP2 (8512)

Product Overview

The Honda S2000 features a highly sophisticated double-wishbone rear suspension setup engineered from the factory for telepathic driver engagement and sports car agility. However, when the S2000 is lowered on performance springs or track-oriented coilovers, the factory geometry forces an aggressive shift into static negative camber. Because the OEM rear upper control arms are fixed, non-adjustable units, standard adjustment methods cannot compensate for this severe angle, resulting in rapid inner tire wear, reduced straight-line braking grip, and unpredictable rear-end snap at the limit.

The Hardrace Adjustable Rear Upper Camber Arm Kit (8512) provides the definitive geometric correction needed to balance your vehicle’s rear footprint. Available at JDMaster.net, this heavy-duty 2-piece control arm kit is built from ultra-high-strength steel alloys to handle the rigorous demands of track and fast-road driving. Pre-assembled with motorsport-grade spherical pillow ball bushings, this kit completely eradicates suspension deflection under high lateral loads, allowing you to fine-tune your rear camber settings to maximize rear tire adhesion and stabilize your cornering lines.

Key Features & Benefits

• Rear Camber Adjustment: Features an on-car adjustable turnbuckle system that enables continuous length calibration, allowing technicians to easily dial out excess negative camber on lowered vehicles.

• Motorsport Spherical Pillow Balls: Pre-installed with zero-clearance, high-hardness spherical metal joints shielded by anti-dust boots. By replacing soft rubber or poly elements, your alignment settings remain 100% constant through intense corners.

• Eliminates Dynamic Alignment Drift: Prevents the rear hub assembly from shifting or twisting laterally under heavy load, providing a highly predictable breakaway limit and reducing dynamic toe change.

• Reinforced High-Tensile Steel Structure: Fabricated from heavy-gauge, hardened steel alloy designed to resist structural twisting, bending, and deformation under heavy throttle application and high-G track cornering.

• Maximizes Tire Contact Patch: Allows you to return rear tracking parameters back to original factory lines for even street tread wear, or optimize them for flat, uniform tire footprint tracking through competitive time attack tracks.

• ED Anti-Corrosion Defense: Treated with Hardrace’s proprietary Electrophoretic Deposition (ED) protective base coat and industrial outer paint layer to resist moisture, dirt, and stone chips.

• Bolt-On Replacement: Engineered using precise physical 3D modeling to ensure a perfect drop-in fit with your factory subframe pickup anchors and rear hub knuckles.

Technical Specifications

Applications

This high-precision adjustable rear upper control arm package features precise physical dimensions engineered to service all model years of Honda’s premier RWD roadster platform:

• Honda S2000 AP1 (1999–2003 Models — F20C)

• Honda S2000 AP2 (2004–2009 Models — F22C1)

The Mechanical Advantage: Taming Lowered S2000 Rear Geometry

The double-wishbone rear suspension of the S2000 relies heavily on the upper control arm to dictate the wheel’s camber gain arc during suspension compression. When you lower the vehicle’s ride height, the rear upper arm tilts upward into a tighter resting angle, drawing the top of the hub knuckle inward. Because the factory subframe eccentric adjustment bolts offer very narrow operational boundaries, standard adjustment methods fail to compensate for the resulting heavy negative camber tilt. When trying to accelerate out of an apex, this angle lifts the outer half of your tire off the tarmac, severely limiting your forward traction.

The Hardrace 8512 adjustable upper arms solve this physical restriction entirely. By lengthening the turnbuckles, your alignment technician can smoothly push the top of the rear knuckle back outward, restoring a full, flat tire contact patch. Furthermore, because factory rubber bushings act like soft compliance springs that distort under pressure, upgrading to zero-clearance spherical pillow balls locks out side-to-side squirm. The result is total authority over your tire wear, increased high-speed stability, and an exceptionally predictable rear-end slip angle.

Professional Lift Installation & Alignment Notes

Technical Fitting Note: Adjusting these rear upper control arms alters your rear camber, track width, and rear steering toe parameters simultaneously, a comprehensive professional four-wheel laser alignment is strictly mandatory immediately following installation. You can arrange a precision setup session at our fully equipped JDMaster.net workshop, where our technicians specialize in high-precision suspension indexing, geometry correction, and custom track-oriented alignment profiling.

Installation Instructions

Before installing, make sure to advise the installation instructions attached.

Warranty

The warranty on Hardrace products depends on the type of product, with a minimum warranty period of 2 years. This warranty does not cover damage caused by a car crash, improper use, negligence or normal wear and tear.