Suspension Goals

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Before starting a new suspension design it was important to set some realistic goals and adjustability limts:

  • Steering Axis Inclination angle between 0° and 8°
  • Scrub radius between 0mm and 10mm
  • Caster angle between 3° and 7°
  • Static camber adjustable from 0° to -4°
  • Camber gain 0.2-0.3 degrees/roll angle at front axle
  • Camber gain 0.5-0.8 degrees/roll angle at rear axle
  • Maximum roll angle about 2°
  • Toe Angle -2° to +2°
  • Trail less than 40mm
  • Roll centre height between 0mm and 50mm in front and slightly higher at rear
  • Well controlled and predictable movement around the roll axis
  • Minimize bump steer
  • Anti-Dive 0-60%
  • 50% – 65% of the roll stiffness on the rear axle

Initial Values

General:

Wheelbase: mm
Front Track Width: mm
Rear Track Width: mm
Moment of Inertia (x/y/z): mm
Total Mass: 610kg
Front/ rear split 46%
 Centre of Gravity Height 365mm
Spring rate front: 24079 N/m
Motion ratio front: 1.3
Spring rate rear: 27261 N/m
Motion ratio rear: 1.25
Front and rear damping ratio: 0.65
Anti-Dive: 60%

 

Front Suspension :

Tyre spec: 235 35 R 19
Roll centre height: 21mm
Camber: -2.0°
Roll camber rate: 0.3° / °
Ride height: 110mm
Bump travel: 80mm
Rebound travel: 80mm
Steering Axis Inclination: 11°
Scrub Radius 36mm
Castor:
Trail: 33mm
Ackermann angle 40%

 

Rear Suspension :

Tyre spec: 235 35 R 19
Roll Centre: 35mm
Camber: -1.3°
Camber Rate: 0.4 ° / °
Ride Height: 110mm
Bump travel: 110mm
Droop travel: 80mm

Bell Crank Suspension »

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