Over 0–100 km/h, 840d xDrive Convertible G15 wins (5,06 s vs 7,15 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.
| 840d xDrive Convertible G15 | 120d F20LCI | |
|---|---|---|
| 0–100 km/h | 5,06 s−2,09 s | 7,15 s |
| 400 m standing start | 13,36 s−1,94 s | 15,30 s |
| 1,000 m standing start | 24,32 s−3,22 s | 27,54 s |
| Top speed (electronically limited) | 250 km/h+22 km/h | 228 km/h |
| Power-to-weight ratio | 5,97 kg/hpbetter ratio | 7,45 kg/hp |
Standing-start drag race, calibrated on manufacturer splits. The gap shows at each stage.
Simulated performance at each stage. Winner in green.
| Palier | 840d xDrive Convertible G15 | 120d F20LCI |
|---|---|---|
| 0–30 km/h | 1,30 s | 2,05 s |
| 0–50 km/h | 2,09 s | 3,27 s |
| 0–80 km/h | 3,63 s | 5,29 s |
| 0–100 km/h | 5,06 s | 7,15 s |
| 0–120 km/h | 6,85 s | 9,55 s |
| 0–160 km/h | 11,73 s | 16,63 s |
| 0–200 km/h | 19,21 s | 30,38 s |
| 400 m standing start | 13,36 s | 15,30 s |
| 1,000 m standing start | 24,32 s | 27,54 s |
| Top speed limited | 250 km/h | 228 km/h |
Manufacturer technical specifications. The power-to-weight ratio is the key physical factor in a drag race.
| Characteristic | Value | Detail |
|---|---|---|
| Power | 340 hp | 6 cyl |
| Torque | 700 Nm | |
| Weight | 2 030 kg | manufacturer kerb weight |
| Drivetrain | Integrale (AWD) | |
| Gearbox | 8-speed Steptronic |
| Characteristic | Value | Detail |
|---|---|---|
| Power | 190 hp | 4 cyl |
| Torque | 400 Nm | |
| Weight | 1 415 kg | manufacturer kerb weight |
| Drivetrain | - | |
| Gearbox | 6-speed manual (8-speed Steptronic) |
Off the line, the Bmw 840d xDrive Convertible hits 100 km/h in 5.06 s versus 7.15 s for the Bmw 120d. At this point, the Bmw 840d xDrive Convertible leads by 2.09 s and sits roughly 25 m ahead.
At 200 metres, the Bmw 840d xDrive Convertible is doing 137 km/h against 124 km/h for the Bmw 120d. The gap is 1.45 s. The challenger starts to claw back ground.
At 400 metres standing start, the Bmw 840d xDrive Convertible crosses the line in 13.36 s versus 15.30 s. The 1.94 s gap represents roughly 80 m of track - a gap visible to the naked eye.
Past 400 metres, the Bmw 840d xDrive Convertible continues to build its lead. At 600 metres, it runs at 192 km/h versus 172 km/h. At 1,000 metres, the Bmw 840d xDrive Convertible finishes in 24.31 s versus 27.53 s, with a 3.22 s lead.
Both rivals are electronically governed, but not at the same level: the Bmw 840d xDrive Convertible is capped at 250 (i.e. 155 mph - industry threshold) km/h, the Bmw 120d at 228 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 (5.97 kg/hp vs 7.45 kg/hp) and transmission (Automatic vs Automatic).
In European road use (130 km/h max), both vehicles reach the legal speed limit in under 10.99 seconds. The 2.09 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.
Over 0–100 km/h, 840d xDrive Convertible G15 wins (5,06 s vs 7,15 s).
840d xDrive Convertible G15 goes from 0 to 100 km/h in 5,06 seconds (calibrated simulation).
840d xDrive Convertible G15: 340 hp, ratio 5,97 kg/hp. 120d F20LCI: 190 hp, ratio 7,45 kg/hp.
840d xDrive Convertible G15: 250 km/h. 120d F20LCI: 228 km/h.