Sierra Uprights

For the modified Ford Sierra set−up I used :

• Modified Sierra uprights.
• Mushroom top hat adapters.
• McSorley 442 chassis with suspension mounts similar to Locost.
• 195/45/15 − Diameter 556mm.
• −1° camber.
• Chassis to ground clearance 150mm.
• Front track 1452mm.

» Download frontSuspensionSierra.dwg

Results

• Roll Centre Height = 916mm
• Swing Arm Radius = 1778mm
• Top Arm delclination = 4.8° & Length = 310mm
• Bottom Arm inclination = 2.0° & Length = 408mm
• Top to Bottom Arm ratio = 0.754
• Steering Axis Inclination = 10.92° + 1° camber (total 11.92°)
• Scrub radius = 63mm

Conclusions

The swing arm radius, scrub and steering arm inclination are much closer to the desired goal.

Some goals such as 10° bottom arm inclination maybe hard to achieve on a road car due to ground clearance requirements, upright and tyre height.

This design is in the right direction. However a lot of trigonometry will be needed to accurately calculate parameters such as performance in bounce.

Updated Sierra »

Seventh Heaven 2nd September 2014