Lap Time: 2:50.3
Class: LL4 | Base: $143,995 | As Tested: $148,995
Power and Weight: 627 hp • 4116 lb • 6.6 lb/hp
Tires: Pirelli P Zero Corsa PZC4, F: 275/35ZR-20 (102Y) ★ R: 285/35ZR-20 (104Y) ★
Without so much as a press release or other announcement, BMW apparently decided it would like the Lightning Lap four-door record back and rolled out a lighter M5 CS. BMW briefly held the record, but then in 2019 was eclipsed by the Mercedes-AMG GT63 S with a 2:49.3 run.
We've lapped the current-gen M5 a couple of times. The standard 600-hp model and the 617-hp Competition managed 2:55.2 and 2:54.0, respectively. The CS gains 10 horsepower, sheds 125 pounds, adds a revised adaptive suspension, and fits Pirelli P Zero Corsa PZC4 track rubber that took grip in Turn 1 from 1.01 g's to 1.04, a tighter hold than the Cadillac CT5-V Blackwing managed.
After that, the Caddy and BMW remain neck and neck, with the BMW giving up fractions of a second in the next three sectors. The M5's V-8 pulls 157.2 mph on the front straight, faster than the Porsche 911 GT3. Despite the added speed, the M5 remains a model citizen. Placid and happy under stress, the M5 puts its insane power down coming out of corners, and the steering is more alive than in other M5s, partially because of the stiffer and grippier track-grade Pirellis.
Unfortunately, BMW didn't send a second set of tires. With only one set to use over three days, the car sat most of the first two days while we waited until the last day to try to set a quick time. Although we didn't have many laps to shave time, the CS proved willing to stay right on the limit in a repeatable and trusty way without much practice. Fresh tires and a few more laps might have been enough to beat the beastly Cadillac.