Bmw X7 M50d vs Porsche 718 Cayman GTS : which one is faster?

The launch: 0 to 100 km/h

Off the line, the 718 Cayman GTS hits 100 km/h in 4.47 s versus 5.49 s for the Bmw X7 M50d. At this point, the 718 Cayman GTS leads by 1.03 s and sits roughly 6 m ahead.

From 100 km/h to 400 metres

At 200 metres, the 718 Cayman GTS is doing 155 km/h against 132 km/h for the Bmw X7 M50d. The gap is 0.78 s. The challenger starts to claw back ground.

At 400 metres standing start, the 718 Cayman GTS crosses the line in 12.32 s versus 13.82 s. The 1.50 s gap represents roughly 67 m of track — a gap visible to the naked eye.

Beyond 400 metres: top speed comes into play

Past 400 metres, the 718 Cayman GTS continues to build its lead. At 600 metres, it runs at 217 km/h versus 184 km/h. At 1,000 metres, the 718 Cayman GTS finishes in 21.96 s versus 25.28 s, with a 3.31 s lead.

What the numbers don’t tell you

Both rivals are electronically governed, but not at the same level: the Bmw X7 M50d is capped at 250 km/h, the 718 Cayman GTS at 290 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 (6.15 kg/hp vs 3.77 kg/hp) and transmission (Automatic vs Manual).

In European road use (130 km/h max), both vehicles reach the legal speed limit in under 8.69 seconds. The 1.03 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.