Weird, personally my experience with older cars is that they're rickety; they croak and squeak and shudder and have a general lack of rigidity. Big, old cars feel disconnected from the road in an concerning way, smaller ones feel like tin cans.
The fundamentals of why this might be a common experience is are objectively demonstrable. First, it helps to understand what torsional rigidity is:
Quote:
Suspension guru Herb Adams (author of Chassis Engineering) defined torsional rigidity (actually “stiffness” in his 1993 publication) as it applies to a vehicle’s chassis as “how much a frame will flex as it’s loaded when one front wheel is up and the other front wheel is down while the rear of the car is held level.” Herb paints a picture that is easy to see while he goes on to say, “ This condition is seen at every corner of the road, so its importance to proper handling should be obvious.” While it may have been obvious to some OEM manufacturers and racecar builders, increasing the torsional rigidity of a vehicle without significantly increasing the weight is the engineering challenge.
Fortunately, advances in computer chassis modeling, higher-strength materials, new welding techniques and superior bonding materials are allowing both OEMs and racecar builders to build vehicles that sport far more torsional rigidity than cars of the past.
Whereas, a 1966 Ford Mustang coupe probably had a spec around 5,000 Nm per degree, today’s 2015 Mustang is well over 20,000 Nm/degree. What’s the high end of current automobile technology? A Bugatti Veyron claims a torsional rigidity over 60,000 Nm/deg.
https://dsportmag.com/the-tech/chassis- ... -rigidity/The old car with enough sound deadening can be made to feel very isolated, but it's a illusion. Frame flex, sloppy bushings and soft dampers can contribute to things being floaty and vague, but those generally aren't viewed as positive traits, they make most people feel less safe driving that car. Virtually all of the feedback they ever receive is to improve things in that regard, not to double-down on it.
A new car might use stiffer bushings and skrimp on sound deadening (to reduce weight, to make fuel economy goals), but it's measurably better in a structural sense.
The isolation is being done by the suspension, not by the entire structure flexing with endless bushings to make it less noticeable, and enough sound deadening to mask the noises. Because the rest of the structure isn't a floppy mess, the suspension (which can now be optimized in simulation long before it's committed to production) can actually do the job it's intended to do.
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