BMW M8 Competition Convertible F92 vs Porsche Boxster Spyder 981: which is truly faster?

Off the line, the M8 Competition Convertible hits 100 km/h in 3.32 s versus 4.59 s for the Boxster Spyder. At this point, the M8 Competition Convertible leads by 1.27 s and sits roughly 10 m ahead.

At 200 metres, the M8 Competition Convertible is doing 168 km/h against 154 km/h for the Boxster Spyder. The gap is 0.96 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 12.41 s. The 1.26 s gap represents roughly 66 m of track - a gap visible to the naked eye.

Past 400 metres, the M8 Competition Convertible continues to build its lead. At 600 metres, it runs at 234 km/h versus 216 km/h. At 1,000 metres, the M8 Competition Convertible finishes in 20.23 s versus 22.15 s, with a 1.93 s lead. Despite a higher top speed (288 km/h), the Boxster Spyder never recovers its launch deficit.

The M8 Competition Convertible features all-wheel drive (AWD) against the Boxster Spyder’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 3.51 kg/hp) and transmission (Automatic vs Manual).

In European road use (130 km/h max), both vehicles reach the legal speed limit in under 6.54 seconds. The 1.27 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.