As has been stated, higher speeds require research into suspension, tires, aerodynamics, brakes etc. A lot of that research once came from auto racing. In the last forty years, sanctioning bodies have been working very hard to keep speeds to 200-230mph because of concerns about spectator safety. Driver safety too, but less strenuously.
There have been several instances where cars have nearly launched into the grandstands, and some fans have been killed by loose wheels. In 1955, a crash at LeMans in France left 100 dead and 100 injured. People were more tolerant of life’s dangers then, but it nearly eliminated the entire sport. It would have a greater effect today.
Until someone constructs a fence that does not restrict visibility but can restrain a 2000 pound car (and the parts that it is shedding) at 250 mph, little research will be done into what is required to go faster. Given the increasing population, it become less possible every day to attain speeds over 100mph for more than a mile at a time, so it’s not practical to design a faster car. And frankly, 100 is as fast as I want to see on public roads. Even in the desert
There’s no need to go 200mph but I can understand the rush of acceleration. If they made a Mustang that went 0-60 in a two seconds, that’s all most would need. Bijou Drains had it right when he said that if you want acceleration, buy a motorcycle. Just don’t drive that fast near me. I can see the bike but my brain doesn’t have enough experience processing a vehicle moving three times faster than me.
