Porsche Cayenne S (8-speed Tiptronic S) 958.1 vs Bmw 840i 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 90%Calibrated physics simulation: SCx via VMax, power curves, Crr via WLTP, drivetrain losses. Manufacturer 0-100 is the calibration target. Confidence 90 %.
Cayenne S (8-speed Tiptronic S) vs Bmw 840i xDrive Gran Coupe: chronicle of a drag race at 258 km/h
The launch: 0 to 100 km/h
Off the line, the Bmw 840i xDrive Gran Coupe hits 100 km/h in 5.03 s versus 5.81 s for the Cayenne S (8-speed Tiptronic S). At this point, the Bmw 840i xDrive Gran Coupe leads by 0.78 s and sits roughly 7 m ahead.
From 100 km/h to 400 metres
At 200 metres, the Bmw 840i xDrive Gran Coupe is doing 139 km/h against 133 km/h for the Cayenne S (8-speed Tiptronic S). The gap is 0.48 s. The challenger starts to claw back ground.
At 400 metres standing start, the Bmw 840i xDrive Gran Coupe crosses the line in 13.29 s versus 13.99 s. The 0.70 s gap represents roughly 32 m of track — a gap visible to the naked eye.
Beyond 400 metres: top speed comes into play
Past 400 metres, the Bmw 840i xDrive Gran Coupe continues to build its lead. At 600 metres, it runs at 194 km/h versus 186 km/h. At 1,000 metres, the Bmw 840i xDrive Gran Coupe finishes in 24.11 s versus 25.30 s, with a 1.19 s lead. Both vehicles have similar top speeds (258 vs 250 km/h), preventing any comeback.
What the numbers don’t tell you
Both rivals are electronically governed, but not at the same level: the Cayenne S (8-speed Tiptronic S) is capped at 258 km/h, the Bmw 840i 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 (5.16 kg/hp vs 5.63 kg/hp) and transmission (Automatic vs Automatic).
In European road use (130 km/h max), both vehicles reach the legal speed limit in under 8.88 seconds. The 0.78 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.
Bmw 840i xDrive Gran Coupe has a clear edge over the Porsche Cayenne S (8-speed Tiptronic S) to 100 km/h. This difference is clearly noticeable in spirited driving and widens on standing starts.