Porsche 911 Turbo S 991.1 vs Bmw M850i xDrive Gran Coupe G15 : which one is faster?
0-100 km/h, 400 m, 1000 m, top speed — physics simulation calibrated on 7 measures.
400 mSimulation de performance
Race simulation at real speed
CONFIDENCE 92%Calibrated physics simulation: SCx via VMax, power curves, Crr via WLTP, drivetrain losses. Manufacturer 0-100 is the calibration target. Confidence 92 %.
911 Turbo S vs Bmw M850i xDrive Gran Coupe: chronicle of a drag race at 317 km/h
The launch: 0 to 100 km/h
Off the line, the 911 Turbo S hits 100 km/h in 2.95 s versus 3.93 s for the Bmw M850i xDrive Gran Coupe. At this point, the 911 Turbo S leads by 0.98 s and sits roughly 10 m ahead.
From 100 km/h to 400 metres
At 200 metres, the 911 Turbo S is doing 176 km/h against 159 km/h for the Bmw M850i xDrive Gran Coupe. The gap is 0.91 s. The gap remains stable from the start.
At 400 metres standing start, the 911 Turbo S crosses the line in 10.57 s versus 11.88 s. The 1.31 s gap represents roughly 70 m of track — a gap visible to the naked eye.
Beyond 400 metres: top speed comes into play
Past 400 metres, the 911 Turbo S continues to build its lead. At 600 metres, it runs at 243 km/h versus 222 km/h. At 1,000 metres, the 911 Turbo S finishes in 19.22 s versus 21.34 s, with a 2.12 s lead.
What the numbers don’t tell you
Both rivals are electronically governed, but not at the same level: the 911 Turbo S is capped at 317 km/h, the Bmw M850i xDrive Gran Coupe at 250 km/h. This isn’t a physical engine limit — it’s a manufacturer choice, usually for tyre safety or homologation reasons. Neither car reaches its true aerodynamic top speed.
With two combustion powertrains, the difference comes down to power-to-weight ratio (2.83 kg/hp vs 3.79 kg/hp) and transmission (Automatic vs Automatic).
In European road use (130 km/h max), both vehicles reach the legal speed limit in under 5.68 seconds. The 0.98 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.
Porsche 911 Turbo S has a clear edge over the Bmw M850i xDrive Gran Coupe to 100 km/h. This difference is clearly noticeable in spirited driving and widens on standing starts.