Corner Balancing - Combustion

Goals:

• getting suspension level and accurate to CAD

• Front and Rear axles should have similar weight distribution across the wheels of one axle

• Rear wheels should have slightly greater values

• Rear CG bias to induce oversteer - more important to FSAE

• ride height - no regulations just avoid scraping - dependent on aero platform and the values they want to ensure X downforce

• toe out

• Rear - ~175 lbs each wheel

• Front - ~155lbs each wheel

Process:

• if FR and RL were the two values most similar and too low- reduce warping moment by either jacking both up or lower the FL and RR

• set up frame and scales on frame - level the frame by adjusting lengths of the corner supports (the ETC garage floor is slanted) - they used some wood panels to elevate rear wheels

• measured ride height - laying extruded T-bar across an axle’s set of scales to have reference flat, use measuring tape to the bottom of body

• measured toe - flat stock on both wheels across axle, then two tape measurers on either side of stock to see the difference

• jacking and adjusting weight to each wheel by

  • adjusting PULLRODS - adjusted in turns

  • adjusting shocks spring perch

• ride height and preload affected

• certain threshold of perch adjustment that does not affect preload

• Pullrod adjust

  • lengthen - wheel up, < weight

  • shorten - wheel down, > weight

• Spring perch adjust

  • lower perch longer spring - pullrod down, wheel down, > weight

  • raise perch shorter spring - pullrod up, wheel up, < weight

• cycling suspension - pushing on the frame after adjustments to let the suspension relax and make sure it is not caught anywhere

• plastic on scales - get rid of tire grip so that suspension “relaxes” for same reasons as cycling

• torque marking - fasteners