Bmw 840i xDrive G15 vs Porsche Cayman 981 : 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 91%Calibrated physics simulation: SCx via VMax, power curves, Crr via WLTP, drivetrain losses. Manufacturer 0-100 is the calibration target. Confidence 91 %.
Bmw 840i xDrive vs Cayman: chronicle of a drag race at 253 km/h
The launch: 0 to 100 km/h
Off the line, the Bmw 840i xDrive hits 100 km/h in 4.81 s versus 5.52 s for the Cayman. At this point, the Bmw 840i xDrive leads by 0.71 s and sits roughly 6 m ahead.
From 100 km/h to 400 metres
At 200 metres, the Bmw 840i xDrive is doing 142 km/h against 136 km/h for the Cayman. The gap is 0.41 s. The challenger starts to claw back ground.
At 400 metres standing start, the Bmw 840i xDrive crosses the line in 13.05 s versus 13.64 s. The 0.59 s gap represents roughly 28 m of track — two to three car lengths.
Beyond 400 metres: top speed comes into play
Past 400 metres, the Bmw 840i xDrive continues to build its lead. At 600 metres, it runs at 198 km/h versus 190 km/h. At 1,000 metres, the Bmw 840i xDrive finishes in 23.65 s versus 24.68 s, with a 1.04 s lead. Both vehicles have similar top speeds (250 vs 253 km/h), preventing any comeback.
What the numbers don’t tell you
Electronically capped at 250 km/h, the Bmw 840i xDrive never reaches its natural aerodynamic ceiling in this duel. That’s not a physical limit of the motor — it’s a deliberate manufacturer decision, typically tied to standard-fit tyre ratings or model-range positioning.
With two combustion powertrains, the difference comes down to power-to-weight ratio (5.39 kg/hp vs 4.70 kg/hp) and transmission (Automatic vs Unknown).
In European road use (130 km/h max), both vehicles reach the legal speed limit in under 8.30 seconds. The 0.71 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.
Bmw 840i xDrive has a clear edge over the Porsche Cayman to 100 km/h. This difference is clearly noticeable in spirited driving and widens on standing starts.