While using special high-tensile bolts to fasten the subframe to the body of the car may seem effective during engine start, idling, and normal driving, the issue of gaps in bolt holes persists. Minute variations between the body and the subframe surface reduce the clamping effectiveness of the fasteners. This misalignment generates low-grade vibrations, preventing the body’s high rigidity from shining through. Spoon’s Rigid Collars are heat-treated aluminium components designed to bridge the gap between the body and subframe of the Mazda MX-5.
As the rigid collar is set between the body and the subframe and bolts are tightened, its tapered outer edge deforms, gradually closing outer gaps. Additionally, the 0.2mm clearance between the collar and the bolt is closed. Furthermore, tightening bolts to specified torque rolls the flange part, filling gaps from surface misalignment. As a result, all gaps and clearances vanish, firmly and completely connecting the body and subframe. This triple effect enhances the Mazda MX-5’s torsional rigidity by up to 6,000 Nm/deg, increasing the inherent rigidity of the vehicle.
Features
- Complete set of rigid collars for front and rear subframes
- Shaking when starting the engine is reduced.
- Vibration is reduced and quietness increases when idling
- Straight-line stability is improved and steering correction is reduced
- The bump from the road surface is alleviated
- Smooth driving and natural roll feel reduce?driving fatigue