The M5’s performance on the two-mile runway at Bruntingthorpe is incandescent. Launch mode delivers devastating and repeatable standing-start acceleration that makes the AMG’s ‘Race Start’ mode feel a bit half-arsed.
The manual Porsche actually steals an advantage to 30mph, yelping off the line with a bare minimum of wheelspin, but once the others find traction the Panamera is helpless against such a torrent of torque.
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The Jag, Porsche and Merc are in touch with the M5 at 60mph, but the BMW’s firepower is irresistible even to the mighty Merc. By 100mph only the AMG is on the same second – 9.3 plays 9.8 – while the XFR is into the 10s. The Panamera is already 2.5sec down on the M5.
At 150mph the Benz is doggedly clinging on to the BMW, but only just (0.7sec down), while the Jag and Porsche have now receded to small dots in the mirror.
Shortly after, the BMW, Benz and Jag drive softly into their speed limiters. The Porsche hits 163mph before it runs out of runway, but it’s a hollow victory.
In our 100mph-0 braking tests the M5 rules once more, followed by the Jag, Porsche and Merc.