Just_a_fan wrote: ↑
Tue Nov 26, 2019 12:48 pm
bill shoe wrote: ↑
Mon Nov 25, 2019 1:41 am
American full-size pickups and SUV's get their top dollar because (among other reasons) they are the only remaining bastion of body-on-frame architecture and the excellent Ride/NVH isolation that comes with it.
Aren't they classed as trucks and thus not required to meet the safety and emissions rules applying to cars? Hence they can be cheaper to make and thus can be sold at an attractive price. Of course the big pickups are very macho which appeals to many.
You can get excellent ride/NVH from a unibody too - the mechanicals are mounted via bushed subframes after all so there is no difference in the path from road to occupant in either type. As shown by the likes of Jaguar etc.
Pickups are classed as light trucks. They have to meet all the safety requirements of cars. In real-world accidents with other vehicles, pickups are safer than cars due to higher weight and higher height/CG. Rollover risk of higher CG is largely gone due to electronic controls (stability control, rollover control).
GHG Emissions in the U.S. are different for cars vs trucks, and trucks have it easier (generally speaking). This is why many car-type unibody vehicles are trying to technically classify themselves as trucks.
Any type of vehicle architecture can be executed well or badly. But if you take an experienced vehicle evaluator, force him to drink a 6-pack, beat him soundly about the head with a large club, blindfold him, stick him in a random car or light-truck, and tell him to drive, I guarantee they will determine in a few seconds if they are driving a body-on-frame or unibody. The difference is that fundamental.
The difference comes from the fact that the full-frame's natural freq (6-10 hz) is lower than the suspension secondary frequency (10-15 hz), therefore the full-frame is an extremely effective barrier against road-induced Ride/Noise getting into the body. Unibody subframes with bushings help but they do not have this fundamental quality that full-frame vehicles do.
After all that hand-waving, I would love to have a Jag!