Bmw X7 xDrive50i vs Porsche Cayman GT4 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
0Calibrated physics simulation: SCx via VMax, power curves, Crr via WLTP, drivetrain losses. Manufacturer 0-100 is the calibration target. Confidence 0 %.
Bmw X7 xDrive50i vs Cayman GT4: chronicle of a drag race at 295 km/h
The launch: 0 to 100 km/h
Off the line, the Cayman GT4 hits 100 km/h in 3.95 s versus 5.24 s for the Bmw X7 xDrive50i. At this point, the Cayman GT4 leads by 1.29 s and sits roughly 15 m ahead.
From 100 km/h to 400 metres
At 200 metres, the Cayman GT4 is doing 155 km/h against 138 km/h for the Bmw X7 xDrive50i. The gap is 1.05 s. The challenger starts to claw back ground.
At 400 metres standing start, the Cayman GT4 crosses the line in 11.90 s versus 13.47 s. The 1.58 s gap represents roughly 73 m of track — a gap visible to the naked eye.
Beyond 400 metres: top speed comes into play
Past 400 metres, the Cayman GT4 continues to build its lead. At 600 metres, it runs at 218 km/h versus 192 km/h. At 1,000 metres, the Cayman GT4 finishes in 21.59 s versus 24.42 s, with a 2.83 s lead.
What the numbers don’t tell you
Electronically capped at 250 km/h, the Bmw X7 xDrive50i 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 (5.32 kg/hp vs 3.48 kg/hp) and transmission (Automatic vs Manual).
In European road use (130 km/h max), both vehicles reach the legal speed limit in under 7.97 seconds. The 1.29 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.
Porsche Cayman GT4 has a clear edge over the Bmw X7 xDrive50i to 100 km/h. This difference is clearly noticeable in spirited driving and widens on standing starts.