BMW X5 M Competition G05 vs Porsche 911 Carrera Cab 991.1: which is truly faster?

Off the line, the Bmw X5 M Competition hits 100 km/h in 3.83 s versus 4.52 s for the 911 Carrera Cab. At this point, the Bmw X5 M Competition leads by 0.68 s and sits roughly 8 m ahead.

At 200 metres, the Bmw X5 M Competition is doing 155 km/h against 148 km/h for the 911 Carrera Cab. The gap is 0.53 s. The challenger starts to claw back ground.

At 400 metres standing start, the Bmw X5 M Competition crosses the line in 11.94 s versus 12.62 s. The 0.67 s gap represents roughly 34 m of track - a gap visible to the naked eye.

Past 400 metres, the Bmw X5 M Competition continues to build its lead. At 600 metres, it runs at 215 km/h versus 208 km/h. At 1,000 metres, the Bmw X5 M Competition finishes in 21.80 s versus 22.72 s, with a 0.93 s lead. Despite a higher top speed (289 km/h), the 911 Carrera Cab never recovers its launch deficit.

The Bmw X5 M Competition features all-wheel drive (AWD) against the 911 Carrera Cab’s RWD. At low speeds (0-30, 0-50, 0-80 km/h), AWD doubles the driven contact area: all four wheels transmit torque to the road, virtually eliminating wheelspin at launch. This traction advantage is decisive in the range where the motor delivers peak torque, before power and aerodynamics take over.

Both rivals are electronically governed, but not at the same level: the Bmw X5 M Competition is capped at 250 (i.e. 155 mph - industry threshold) km/h, the 911 Carrera Cab at 289 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 (3.74 kg/hp vs 4.29 kg/hp) and transmission (Automatic vs Unknown).

In European road use (130 km/h max), both vehicles reach the legal speed limit in under 6.73 seconds. The 0.68 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.