Over 0–100 km/h, 840i Convertible G15 wins (5,57 s vs 5,71 s).
Performance comparison
Simulated drag race 0 → 1,000 m in real time. Synchronised speed counters and stopwatch. Physics calibration on 7 manufacturer measurements.
Simulation
Calibration
Physics model calibrated on manufacturer splits. The limited top speed is not the real aerodynamic top speed of the vehicles.
| 840i Convertible G15 | Boxster 987 | |
|---|---|---|
| 0–100 km/h | 5,57 s−0,14 s | 5,71 s |
| 400 m standing start | 13,79 s−0,21 s | 14,00 s |
| 1,000 m standing start | 24,82 s−0,43 s | 25,25 s |
| Top speed (electronically limited) | 250 km/h+6 km/h | 244 km/h |
| Power-to-weight ratio | 5,53 kg/hp | 5,15 kg/hpbetter ratio |
Standing-start drag race, calibrated on manufacturer splits. The gap shows at each stage.
Simulated performance at each stage. Winner in green.
| Palier | 840i Convertible G15 | Boxster 987 |
|---|---|---|
| 0–30 km/h | 1,54 s | 1,41 stight gap |
| 0–50 km/h | 2,50 s | 2,33 s |
| 0–80 km/h | 4,11 s | 4,29 s |
| 0–100 km/h | 5,57 s | 5,71 stight gap |
| 0–120 km/h | 7,39 s | 7,87 s |
| 0–160 km/h | 12,34 s | 13,10 s |
| 0–200 km/h | 19,98 s | 21,41 s |
| 400 m standing start | 13,79 s | 14,00 s |
| 1,000 m standing start | 24,82 s | 25,25 s |
| Top speed limited | 250 km/h | 244 km/h |
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 | 1 840 kg | manufacturer kerb weight |
| Drivetrain | - | |
| Gearbox | 8-speed Steptronic |
| Characteristic | Value | Detail |
|---|---|---|
| Power | 259 hp | B6 |
| Torque | 290 Nm | |
| Weight | 1 335 kg | manufacturer kerb weight |
| Drivetrain | Propulsion | |
| Gearbox | Unknown |
Off the line, the Bmw 840i Convertible hits 100 km/h in 5.57 s versus 5.72 s for the Boxster. The 0.14 s gap is negligible: both vehicles are neck and neck.
At 200 metres, the Bmw 840i Convertible is doing 136 km/h against 132 km/h for the Boxster. The gap is 0.09 s. The gap remains stable from the start.
At 400 metres standing start, the Bmw 840i Convertible crosses the line in 13.79 s versus 13.99 s. The 0.20 s gap represents roughly 9 m of track - barely a car length.
Past 400 metres, the Bmw 840i Convertible continues to build its lead. At 600 metres, it runs at 190 km/h versus 187 km/h. At 1,000 metres, the Bmw 840i Convertible finishes in 24.82 s versus 25.24 s, with a 0.43 s lead. Both vehicles have similar top speeds (250 (i.e. 155 mph - industry threshold) vs 244 km/h), preventing any comeback.
Both rivals are electronically governed, but not at the same level: the Bmw 840i 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 (5.53 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 9.00 seconds. The 0.14 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 Convertible G15 wins (5,57 s vs 5,71 s).
840i Convertible G15 goes from 0 to 100 km/h in 5,57 seconds (calibrated simulation).
840i Convertible G15: 333 hp, ratio 5,53 kg/hp. Boxster 987: 259 hp, ratio 5,15 kg/hp.
840i Convertible G15: 250 km/h. Boxster 987: 244 km/h.