Over 0–100 km/h, 840i Convertible G15 and Boxster are neck and neck (5,57 s vs 5,60 s, no significant gap).
Simulated drag race 0 → 1,000 m in real time. Synchronised speed counters and stopwatch. Physics calibration on 7 manufacturer measurements.
| Measure | 840i Convertible G15 | Boxster | Gap |
|---|---|---|---|
| 0–100 km/h | 5.57 s | 5.60 s | 0.03 s · 840i Convertible G15 |
| 400 m standing start | 13.79 s | 13.86 s | 0.07 s · 840i Convertible G15 |
| 1,000 m standing start | 24.82 s | 25.21 s | 0.39 s · 840i Convertible G15 |
| Top speed (electronically limited) | 250 km/h | 252 km/h | 2 km/h · Boxster |
| Power-to-weight ratio | 5.53 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 Convertible G15 | Boxster |
|---|---|---|
| 0–30 km/h | 1.54 s | 1.42 s · tight gap |
| 0–50 km/h | 2.50 s | 2.35 s |
| 0–80 km/h | 4.11 s · tight gap | 4.14 s |
| 0–100 km/h | 5.57 s · tight gap | 5.60 s |
| 0–120 km/h | 7.39 s | 7.55 s |
| 0–160 km/h | 12.34 s | 12.82 s |
| 0–200 km/h | 19.98 s | 21.85 s |
| 400 m standing start | 13.79 s · tight gap | 13.86 s |
| 1,000 m standing start | 24.82 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 | 1 840 kg | manufacturer kerb weight |
| Drivetrain | - | |
| 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 Convertible hits 100 km/h in 5.57 s versus 5.60 s for the Boxster. The 0.03 s gap is negligible: both vehicles are neck and neck.
At 200 metres, the Boxster is doing 134 km/h against 136 km/h for the 840i Convertible. The gap is 0.01 s. The gap remains stable from the start.
At 400 metres standing start, the 840i Convertible crosses the line in 13.79 s versus 13.86 s. The 0.07 s gap represents roughly 3 m of track - barely a car length.
Past 400 metres, the 840i 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 Convertible finishes in 24.82 s versus 25.21 s, with a 0.39 s lead. Both vehicles have similar top speeds (250 (i.e. 155 mph - industry threshold) vs 252 km/h), preventing any comeback.
Both rivals are electronically governed, but not at the same level: the 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 8.61 seconds. The 0.03 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 and Boxster are neck and neck (5,57 s vs 5,60 s, no significant gap).
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: 259 hp, ratio 5,15 kg/hp.
840i Convertible G15: 250 km/h. Boxster: 252 km/h.