T651 Material: Aerospace Lightness, Racing Endurance

The foundation of our proprietary components, such as control arms and camber plates, is T651 aluminum alloy. In the world of mass production, cheap cast iron reigns supreme-heavy, clunky, and prone to material fatigue.

Why T651?

• Weight Reduction: Replacing heavy cast iron with CNC-milled T651 aluminum allows us to reduce component weight by dozens of percent, drastically decreasing unsprung mass. As a result, the suspension reacts faster, and the tire maintains better contact with the road surface.

• Structural Stability: The T651 temper denotes aluminum that has been solution heat-treated, aged, and then stress-relieved by controlled stretching. The result? A component that does not deform even under extreme loads.

Handling Precision: Uniballs and Polyurethane

In factory cars, rubber bushings are designed for noise vibration harshness (NVH) damping, which comes at the expense of steering precision. At Restomotive, we eliminate this compromise:

• Uniballs (Spherical Bearings): Where absolute geometric precision is required, we use uniball-type bearings. They allow the suspension to work freely along its axis of rotation, eliminating any “play” or lateral wheel deflection under cornering loads.

• Polyurethane: Where we seek a balance between comfort and stiffness, we use high-quality polymers that are significantly more durable than rubber and retain their characteristics for years.

Adjustability and Hardware: 40 HMT Turnbuckles and Stainless Steel

Our adjustable control arms are masterpieces of mechanical engineering. We utilize turnbuckles made from 40 HMT (40CrMo4) steel. This is a high-strength alloy structural steel designed for quenching and tempering, characterized by immense tensile and fatigue strength.

• 40 HMT: This material allows us to use smaller cross-sections while maintaining higher strength than standard bolts.

• Stainless Steel: All bushings and spacers are made from stainless steel materials. Why? Because we know our components operate in harsh conditions. A precision mechanism must be corrosion-resistant so that adjustments remain possible even after several seasons of intense use.

Camber and Caster Plates: Total Geometry Control

Our Camber and Caster Plates are the heart of the steering system in performance builds. They allow for independent adjustment of the wheel’s tilt (Camber) and the steering axis inclination (Caster). This is the key to “dialing in” a car for a specific track, tire, or driving style-something often impossible with OEM solutions.

On the Horizon: Generative Design

As passionate engineers, we closely follow the development of generative design. Although we currently focus on proven, high-strength subtractive manufacturing (milling from solid T651 blocks), we are fascinated by a future where algorithms design shapes inspired by organic structures, optimizing every metal molecule for load distribution. This direction, combined with 3D metal printing, could define the next decade of motorsport.

Synergy with Öhlins

Our material technology creates the perfect ecosystem for Öhlins shock absorbers. The Swedish DFV (Dual Flow Valve) technology requires a stiff, precise “environment” to demonstrate its full potential. Restomotive’s rigid control arms and precision Camber Plate mounts ensure that Öhlins hydraulics don’t have to fight against the flex of rubber or soft steel-they can focus solely on controlling traction.