Over 0–100 km/h, 840i xDrive Convertible G15 wins (5,30 s vs 5,60 s).
Simulated drag race 0 → 1,000 m in real time. Synchronised speed counters and stopwatch. Physics calibration on 7 manufacturer measurements.
5.60 s
| Measure | 840i xDrive Convertible G15 | Boxster | Gap |
|---|---|---|---|
| 0–100 km/h | 5.30 s | 5.60 s | 0.30 s · 840i xDrive Convertible G15 |
| 400 m standing start | 13.57 s | 13.86 s | 0.29 s · 840i xDrive Convertible G15 |
| 1,000 m standing start | 24.59 s | 25.21 s | 0.62 s · 840i xDrive Convertible G15 |
| Top speed (electronically limited) | 250 km/h | 252 km/h | 2 km/h · Boxster |
| Power-to-weight ratio | 5.75 kg/hp | 5.15 kg/hp | better ratio · Boxster |
Standing-start drag race, calibrated on manufacturer splits. The gap shows at each stage.
| Stage | 840i xDrive Convertible G15 | Boxster |
|---|---|---|
| 0–30 km/h | 1.36 s · tight gap | 1.42 s |
| 0–50 km/h | 2.25 s · tight gap | 2.35 s |
| 0–80 km/h | 3.85 s | 4.14 s |
| 0–100 km/h | 5.30 s | 5.60 s |
| 0–120 km/h | 7.11 s | 7.55 s |
| 0–160 km/h | 12.08 s | 12.82 s |
| 0–200 km/h | 19.74 s | 21.85 s |
| 400 m standing start | 13.57 s | 13.86 s |
| 1,000 m standing start | 24.59 s | 25.21 s |
| Top speed limited | 250 km/h | 252 km/h |
Physics model calibrated on manufacturer splits. The limited top speed is not the real aerodynamic top speed of the vehicles.
Manufacturer technical specifications. The power-to-weight ratio is the key physical factor in a drag race.
| Characteristic | Value | Detail |
|---|---|---|
| Power | 333 hp | 6 cyl |
| Torque | 500 Nm | |
| Weight | 1 915 kg | manufacturer kerb weight |
| Drivetrain | Integrale (AWD) | |
| Gearbox | 8-speed Steptronic |
| Characteristic | Value | Detail |
|---|---|---|
| Power | 259 hp | Engine block and cylinder heads formed in aluminum |
| Torque | 290 Nm | |
| Weight | 1 335 kg | manufacturer kerb weight |
| Drivetrain | Propulsion | |
| Gearbox | 6 speed standard |
Off the line, the 840i xDrive Convertible hits 100 km/h in 5.30 s versus 5.60 s for the Boxster. At this point, the 840i xDrive Convertible leads by 0.30 s and sits roughly 4 m ahead.
At 200 metres, the 840i xDrive Convertible is doing 136 km/h against 134 km/h for the Boxster. The gap is 0.21 s. The gap remains stable from the start.
At 400 metres standing start, the 840i xDrive Convertible crosses the line in 13.56 s versus 13.86 s. The 0.30 s gap represents roughly 14 m of track - two to three car lengths.
Past 400 metres, the 840i xDrive Convertible continues to build its lead. At 600 metres, it runs at 190 km/h versus 185 km/h. At 1,000 metres, the 840i xDrive Convertible finishes in 24.59 s versus 25.21 s, with a 0.62 s lead. Both vehicles have similar top speeds (250 (i.e. 155 mph - industry threshold) vs 252 km/h), preventing any comeback.
The 840i xDrive Convertible features all-wheel drive (AWD) against the Boxster’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 840i xDrive Convertible is capped at 250 (i.e. 155 mph - industry threshold) km/h, the Boxster at 262 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 (5.75 kg/hp vs 5.15 kg/hp) and transmission (Automatic vs Unknown).
In European road use (130 km/h max), both vehicles reach the legal speed limit in under 8.61 seconds. The 0.30 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.
Swap one of the two models to explore an equivalent duel in the same segment.
Over 0–100 km/h, 840i xDrive Convertible G15 wins (5,30 s vs 5,60 s).
840i xDrive Convertible G15 goes from 0 to 100 km/h in 5,30 seconds (calibrated simulation).
840i xDrive Convertible G15: 333 hp, ratio 5,75 kg/hp. Boxster: 259 hp, ratio 5,15 kg/hp.
840i xDrive Convertible G15: 250 km/h. Boxster: 252 km/h.