Bmw 840i Gran Coupe 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 94%The Bmw 840i reaches 100 km/h first (5.46 s vs 5.52 s), but the Cayman is ahead at every metre of the race. Explanation: the Cayman accelerates harder at low speed and builds a distance gap before either car hits 100 km/h.
Why this result?
The Bmw 840i Gran Coupe is faster at 0-100 km/h, but the Porsche Cayman compensates at high speed thanks to higher peak power or top speed. At 400 m, Porsche Cayman leads by 0.06 s.
Calibrated physics simulation: SCx via VMax, power curves, Crr via WLTP, drivetrain losses. Manufacturer 0-100 is the calibration target. Confidence 94 %.
Bmw 840i Gran Coupe vs Cayman: a drag race to the millisecond
The launch: 0 to 100 km/h
Off the line, the Bmw 840i Gran Coupe hits 100 km/h in 5.46 s versus 5.52 s for the Cayman. The 0.06 s gap is negligible: both vehicles are neck and neck.
From 100 km/h to 400 metres
At 200 metres, the Cayman is doing 136 km/h against 137 km/h for the Bmw 840i Gran Coupe. The gap is 0.06 s. The gap remains stable from the start.
At 400 metres standing start, the Cayman crosses the line in 13.64 s versus 13.69 s. The 0.06 s gap represents roughly 3 m of track — barely a car length.
Beyond 400 metres: top speed comes into play
Past 400 metres, nothing changes. Same ceiling, same acceleration, same trajectory — both rivals run in formation to the line. The 0.00 s gap at 1,000 metres confirms what the specs already suggested: on track, they’re interchangeable. The real contest happens elsewhere — range, comfort, charging network reliability.
What the numbers don’t tell you
Electronically capped at 250 km/h, the Bmw 840i Gran Coupe 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 (5.45 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 0.06 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.
Bmw 840i Gran Coupe and Porsche Cayman are virtually tied to 100 km/h. The gap is under a tenth of a second — only the physics engine can settle it step by step.