Car Tuning Suspension and Handling Dynamics Questions and Answers

Question 1

A technician is setting up a track car and wants to reduce understeer. Which of the following adjustments to the anti-roll bars (sway bars) would be most effective?

Accepted Answer

Soften the front anti-roll bar or stiffen the rear anti-roll bar.

Answer

Stiffen the front anti-roll bar or soften the rear anti-roll bar.

Answer

Stiffen both the front and rear anti-roll bars equally.

Answer

Remove the front anti-roll bar entirely.

Question 2

A customer has lowered their car with MacPherson strut front suspension significantly using coilovers. They now complain that despite the lower center of gravity, the car seems to have more body roll and less predictable handling. What is the most likely cause?

Accepted Answer

The roll center has dropped significantly more than the center of gravity, increasing the roll couple.

Answer

The spring rates chosen are too soft for the new ride height.

Answer

The dampers are bottoming out due to reduced suspension travel.

Answer

The caster angle has been negatively affected, reducing steering stability.

Question 3

What is the primary purpose of suspension anti-dive and anti-squat geometry?

Accepted Answer

To use the forces of braking and acceleration to counteract the vehicle's tendency to pitch forward or backward.

Answer

To increase mechanical grip during cornering by adjusting camber gain.

Answer

To prevent the suspension from bottoming out over large bumps by increasing the spring rate dynamically.

Answer

To provide a self-centering steering effect after completing a turn.

Question 4

When adjusting a high-performance damper (shock absorber), what is the fundamental difference between compression and rebound damping?

Accepted Answer

Compression adjustments primarily affect cornering stability, while rebound adjustments affect ride comfort.

Answer

Compression controls high-speed movements, while rebound controls low-speed movements.

Answer

Compression controls the speed at which the shock shortens, while rebound controls the speed at which it extends.

Answer

Compression is adjusted to set ride height, while rebound is adjusted to control body roll.

Question 5

A tuner is making alignment changes to a race car to improve high-speed stability and provide better steering feedback. Which of the following adjustments would achieve this?

Accepted Answer

Increasing positive caster.

Answer

Decreasing positive caster.

Answer

Setting the toe to be significantly 'toed-out'.

Answer

Increasing negative camber to an extreme degree.

Question 6

What is the term for the unwanted steering of the wheels that occurs as the suspension moves through its vertical travel, independent of driver input?

Accepted Answer

Bump steer

Answer

Ackermann steer

Answer

Roll steer

Answer

Caster steer