Quick answer: Unreal Chaos Vehicle launching unrealistically over small bumps? Tire load spike from rigid body impact applies as instant force - tune suspension damping and add load smoothing.
Sports car hits a 5cm curb and flies 3m into the air. Tire load went from 5kN to 200kN in one frame.
Raise damping rates
Per wheel, increase damping_compression to ~5.0 and damping_relaxation to ~3.0. The spike dissipates before it propagates to the chassis.
Smooth tire load
Custom code: low-pass filter the per-wheel load. Vehicle physics get the smoothed value; chassis sees gentle response to bumps.
Or limit max suspension force
Clamp the suspension force per wheel. Hard ceiling prevents the spike from translating to chassis launch.
“Vehicle physics amplifies impacts. The amplification needs damping at multiple stages.”
If your vehicles do unrealistic things, the bug is usually in suspension tuning, not in the chassis. Look at the wheels first.