Over 0–100 km/h, 840i xDrive Convertible G15 wins (5,30 s vs 7,04 s).
Simulated drag race 0 → 1,000 m in real time. Synchronised speed counters and stopwatch. Physics calibration on 7 manufacturer measurements.
7.04 s
| Measure | 840i xDrive Convertible G15 | 420d F32 | Gap |
|---|---|---|---|
| 0–100 km/h | 5.30 s | 7.04 s | 1.74 s · 840i xDrive Convertible G15 |
| 400 m standing start | 13.57 s | 15.11 s | 1.54 s · 840i xDrive Convertible G15 |
| 1,000 m standing start | 24.59 s | 27.78 s | 3.19 s · 840i xDrive Convertible G15 |
| Top speed (electronically limited) | 250 km/h | 240 km/h | 10 km/h · 840i xDrive Convertible G15 |
| Power-to-weight ratio | 5.75 kg/hp | 8.45 kg/hp | better ratio · 840i xDrive Convertible G15 |
Standing-start drag race, calibrated on manufacturer splits. The gap shows at each stage.
| Stage | 840i xDrive Convertible G15 | 420d F32 |
|---|---|---|
| 0–30 km/h | 1.36 s · tight gap | 1.37 s |
| 0–50 km/h | 2.25 s · tight gap | 2.40 s |
| 0–80 km/h | 3.85 s | 4.80 s |
| 0–100 km/h | 5.30 s | 7.04 s |
| 0–120 km/h | 7.11 s | 9.85 s |
| 0–160 km/h | 12.08 s | 18.13 s |
| 0–200 km/h | 19.74 s | 33.30 s |
| 400 m standing start | 13.57 s | 15.11 s |
| 1,000 m standing start | 24.59 s | 27.78 s |
| Top speed limited | 250 km/h | 240 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 | 190 hp | 4 cyl |
| Torque | 400 Nm | |
| Weight | 1 605 kg | manufacturer kerb weight |
| Drivetrain | - | |
| Gearbox | Eight-speed Steptronic transmission |
Off the line, the 840i xDrive Convertible hits 100 km/h in 5.30 s versus 7.04 s for the 420d. At this point, the 840i xDrive Convertible leads by 1.74 s and sits roughly 9 m ahead.
At 200 metres, the 840i xDrive Convertible is doing 136 km/h against 119 km/h for the 420d. The gap is 0.85 s. The challenger starts to claw back ground.
At 400 metres standing start, the 840i xDrive Convertible crosses the line in 13.56 s versus 15.10 s. The 1.54 s gap represents roughly 62 m of track - a gap visible to the naked eye.
Past 400 metres, the 840i xDrive Convertible continues to build its lead. At 600 metres, it runs at 190 km/h versus 166 km/h. At 1,000 metres, the 840i xDrive Convertible finishes in 24.59 s versus 27.77 s, with a 3.19 s lead. Both vehicles have similar top speeds (250 (i.e. 155 mph - industry threshold) vs 240 km/h), preventing any comeback.
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 420d at 240 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 8.45 kg/hp) and transmission (Automatic vs Automatic).
In European road use (130 km/h max), both vehicles reach the legal speed limit in under 11.60 seconds. The 1.74 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.
Over 0–100 km/h, 840i xDrive Convertible G15 wins (5,30 s vs 7,04 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. 420d F32: 190 hp, ratio 8,45 kg/hp.
840i xDrive Convertible G15: 250 km/h. 420d F32: 240 km/h.