Uniball Upright-Bushing-Kit „KT-Track“ for Exige V6

Uniball Upright-Bushing-Kit „KT-Track“ for Exige V6

(rear axle, lower Upright)

The encapsulated bearings, which form the connection to the upper and lower wishbones in the rear Uprights of the "Exige", can reach their limits in motorsport and on track days.

The high brake-forces (that happens when using semi-slicks), the aerodynamic downforce on the rear axle and driving over the "Kerbs" can lead to considerable axial forces, especially in the lower bearing, that enlarges the clearance and press the bearing out of the hole. (Picture 4ff – of the rear upright after an accident on the racetrack)

We make an approx. calculation of the axial forces at the lower and upper bearing of the Upright and come here ("worst case" scenario) to an axial force in the lower bearing (force Bz) of 1,920 kg and in the upper bearing (force Az) of 960 kg.

The following figures ​​were used for the calculation:

Static wheel load: 375 kg

Dynamic wheel load (2g): 750 kg

Radius of the wheel: 350 mm

Coefficient of friction of the tire 1.35

The standard spec bearings (see sectional drawings) have an edged outer housing, so that the axial forces can only be reduced on the bearing shell made of plastic. Under extreme loads, because of that the plastic can be overloaded.

We have therefore developed a technical solution with a special uniball spherical bush that can absorb radial dynamic forces of up to 9,300 kg and axial forces significantly above the maximum values ​​of our calculation.

We supply a set of bearing bushes (2 pieces) for the rear, lower wishbone. The wishbone/upright itself is not included.