Porsche Cayenne Turbo S 958.1 vs Bmw M850i xDrive Convertible 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 %.
Cayenne Turbo S vs Bmw M850i xDrive Convertible: chronicle of a drag race at 279 km/h
The launch: 0 to 100 km/h
Off the line, the Bmw M850i xDrive Convertible hits 100 km/h in 3.96 s versus 4.36 s for the Cayenne Turbo S. At this point, the Bmw M850i xDrive Convertible leads by 0.40 s and sits roughly 4 m ahead.
From 100 km/h to 400 metres
At 200 metres, the Bmw M850i xDrive Convertible is doing 161 km/h against 152 km/h for the Cayenne Turbo S. The gap is 0.36 s. The gap remains stable from the start.
At 400 metres standing start, the Bmw M850i xDrive Convertible crosses the line in 11.82 s versus 12.42 s. The 0.59 s gap represents roughly 31 m of track — a gap visible to the naked eye.
Beyond 400 metres: top speed comes into play
Past 400 metres, the Bmw M850i xDrive Convertible continues to build its lead. At 600 metres, it runs at 226 km/h versus 211 km/h. At 1,000 metres, the Bmw M850i xDrive Convertible finishes in 21.13 s versus 22.41 s, with a 1.29 s lead. Despite a higher top speed (279 km/h), the Cayenne Turbo S never recovers its launch deficit.
What the numbers don’t tell you
Both rivals are electronically governed, but not at the same level: the Cayenne Turbo S is capped at 282 km/h, the Bmw M850i xDrive Convertible 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 (3.81 kg/hp vs 3.87 kg/hp) and transmission (Automatic vs Automatic).
In European road use (130 km/h max), both vehicles reach the legal speed limit in under 6.36 seconds. The 0.40 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.
Bmw M850i xDrive Convertible is slightly faster than the Porsche Cayenne Turbo S to 100 km/h. The edge holds on standing starts but may narrow at higher speeds depending on aerodynamic load.