The 3Racing SAK-D5609 Aluminum Rear Bulkhead is produced to tighten rear chassis tolerances on the Sakura D5S platform. Machined aluminium construction reduces deflection under load, maintaining intended suspension geometry and ensuring repeatable handling characteristics for setup comparison. The component is dimensionally accurate to match OEM attachment points.
Increased stiffness at the rear bulkhead lowers chassis compliance, which aids in consistent diff behaviour and predictable roll characteristics. This facilitates more precise tuning of damping and anti-roll components when optimising drift or circuit setups.
Install using correct torque values to avoid stress concentrations. Verify alignment with rear hubs and suspension arms after fitting. For track use, inspect fasteners and mating surfaces between sessions and apply light thread locker where vibration may induce loosening.