Loading up weight does make the ride smoother because suspension stiffness stays the same, unlike when a heavier car is designed.
The newer sedan was likely designed to tolerate spirited driving. When designing a car, they’re aiming for an appropriate resonant frequency for body up-down bounce, under 1 Hz for good comfort, more for sportier ride. Featherweight Citroën 2CV gives a very soft ride.
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Loading up weight does make the ride smoother because suspension stiffness stays the same, unlike when a heavier car is designed.
The newer sedan was likely designed to tolerate spirited driving. When designing a car, they’re aiming for an appropriate resonant frequency for body up-down bounce, under 1 Hz for good comfort, more for sportier ride. Featherweight Citroën 2CV gives a very soft ride.