Porsche 911 Carrera 4S 991.1 vs Bmw 840d xDrive Gran Coupe G15 : which one is faster?
0-100 km/h, 400 m, 1000 m, top speed — physics simulation calibrated on 7 measures.
Simulation de performance
Race simulation at real speed
CONFIDENCE 95%Calibrated physics simulation: SCx via VMax, power curves, Crr via WLTP, drivetrain losses. Manufacturer 0-100 is the calibration target. Confidence 95 %.
911 Carrera 4S vs Bmw 840d xDrive Gran Coupe: chronicle of a drag race at 298 km/h
The launch: 0 to 100 km/h
Off the line, the 911 Carrera 4S hits 100 km/h in 4.44 s versus 4.90 s for the Bmw 840d xDrive Gran Coupe. The 0.46 s gap is negligible: both vehicles are neck and neck.
From 100 km/h to 400 metres
At 200 metres, the 911 Carrera 4S is doing 153 km/h against 138 km/h for the Bmw 840d xDrive Gran Coupe. The gap is 0.37 s. The gap remains stable from the start.
At 400 metres standing start, the 911 Carrera 4S crosses the line in 12.33 s versus 13.20 s. The 0.88 s gap represents roughly 41 m of track — a gap visible to the naked eye.
Beyond 400 metres: top speed comes into play
Past 400 metres, the 911 Carrera 4S continues to build its lead. At 600 metres, it runs at 217 km/h versus 193 km/h. At 1,000 metres, the 911 Carrera 4S finishes in 22.01 s versus 24.10 s, with a 2.09 s lead.
What the numbers don’t tell you
Both rivals are electronically governed, but not at the same level: the 911 Carrera 4S is capped at 298 km/h, the Bmw 840d 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 (3.56 kg/hp vs 5.87 kg/hp) and transmission (Manual vs Automatic).
In European road use (130 km/h max), both vehicles reach the legal speed limit in under 7.67 seconds. The 0.46 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.
Porsche 911 Carrera 4S has a clear edge over the Bmw 840d xDrive Gran Coupe to 100 km/h. This difference is clearly noticeable in spirited driving and widens on standing starts.