And so to that kerb weight. This may be the most powerful road car that BMW’s M division has made but, in as-tested form, it weighed precisely the same as the original F90 BMW M5 that we tested in 2018 (1940kg on the scales, fully fuelled). It also develops the same 553lb ft of torque as the standard M5 did (albeit over a broader band of revs). Could it be that much quicker against the clock?
Believe it. Whereas the standard car needed 3.3sec to hit 60mph from rest and 7.5sec to hit 100mph three years ago, the CS cuts the former to just 3.0sec and the latter to a faintly staggering 6.8sec. Our test car did that on Michelin Pilot Sport 4S tyres, it’s worth noting. On a warm set of the standard-fit Pirelli Corsas, there’s reason to believe it could go a tenth or two quicker over both measurements.
Whichever tyre it’s on, then, this is a near-two-tonne, four-seat executive car that’s as quick as a supercar up to the national speed limit. It goes through a standing quarter mile at precisely the same prevailing speed as a Porsche Taycan Turbo S and would be travelling significantly quicker than the Porsche by the time a standing kilometre came up. It isn’t in every sense the very biggest-performing four-door on the planet, because there are a handful of rivals – both electric and piston-powered – with slightly greater firepower. But it misses that mark by a margin so small that you might well consider it completely insignificant and you’d be very unlikely to notice it on the road.