BMW M8 Competition Convertible F92 vs Porsche 911 R 991.2: which is truly faster?

Off the line, the M8 Competition Convertible hits 100 km/h in 3.32 s versus 3.78 s for the 911 R. At this point, the M8 Competition Convertible leads by 0.46 s and sits roughly 4 m ahead.

At 200 metres, the M8 Competition Convertible is doing 168 km/h against 166 km/h for the 911 R. The gap is 0.27 s. The challenger starts to claw back ground.

At 400 metres standing start, the M8 Competition Convertible crosses the line in 11.14 s versus 11.38 s. The 0.23 s gap represents roughly 14 m of track - two to three car lengths.

Past 400 metres, the situation changes. The M8 Competition Convertible maxes out at 250 (i.e. 155 mph - industry threshold) km/h while the 911 R keeps accelerating towards 325 km/h. At 600 metres, the gap has dropped to 0.19 s.

Around 970 metres, both vehicles are level. This is the inversion point: the 911 R overcomes its launch deficit thanks to a 75 km/h higher top speed.

At 1,000 metres, the 911 R finishes in 20.19 s versus 20.23 s. The 0.03 s delta shows an extremely tight race.

The M8 Competition Convertible features all-wheel drive (AWD) against the 911 R’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.

Electronically capped at 250 (i.e. 155 mph - industry threshold) km/h, the M8 Competition Convertible 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 (3.24 kg/hp vs 2.74 kg/hp) and transmission (Automatic vs Manual).

In European road use (130 km/h max), both vehicles reach the legal speed limit in under 5.33 seconds. The 0.46 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.