All cars are very similar in size, with around 15% difference in height and length. The width is very constant (otherwise they wouldn't fit on our tiny roads). All have a wheel at each corner, roughly.Surely it's the effect that weight has that is the point, not the weight itself?
If technology mitigates the effect of the weight, then a heavier car can have all the same qualities of a lighter car.
What's the heaviest that a sports car can be, and why?
The one biggest difference is their weight. No matter how clever manufacturers and engineers are, you can't disguise weight on a big lump of metal hurtling along bendy roads. Physics says this is so. The weight will always make itself known in one form or another.
If a car is so clever that it can make you not notice the weight, it isn't going to be 'fun' to drive. Actually, no, it is physically impossible for a car to not show it's weight at one time or another.
Look at the benchmark 'sportscar'.....the MGB. They were badly built, old technology even when new, gutless engines, crude chassis and suspension. But they were very light with skinny tyres and no power steering. They are extremely fun to drive. Like driving a go kart.
The Lotus Elise, a modern day benchmark sportscar. They are extremely popular because they are massively fun and involving to drive. They were not powerful but were well engineered and very very LIGHT.
Maybe the words 'involving to drive' should be the criteria to make a car a 'sportscar'. IMHO to be properly involved in driving a car it needs to be light. The lighter the better.
BMW have used the strap line 'the ultimate driving machine' for years. It's marketing bollox.....they ain't. I know this is a BMW forum and people love their Z4s, but for me they are NOT sportscars, purely because they are too heavy.

