Over 0–100 km/h, 125i F20LCI wins (6,15 s vs 7,75 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.
| 125i F20LCI | 420d Convertible G22 | |
|---|---|---|
| 0–100 km/h | 6,15 s−1,60 s | 7,75 s |
| 400 m standing start | 14,36 s−1,28 s | 15,64 s |
| 1,000 m standing start | 25,91 s−2,78 s | 28,69 s |
| Top speed (electronically limited) | 243 km/h+7 km/h | 236 km/h |
| Power-to-weight ratio | 6,25 kg/hpbetter ratio | 9,34 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 | 125i F20LCI | 420d Convertible G22 |
|---|---|---|
| 0–30 km/h | 1,66 s | 1,52 stight gap |
| 0–50 km/h | 2,77 s | 2,64 stight gap |
| 0–80 km/h | 4,57 s | 5,29 s |
| 0–100 km/h | 6,15 s | 7,75 s |
| 0–120 km/h | 8,17 s | 10,87 s |
| 0–160 km/h | 13,86 s | 20,11 s |
| 0–200 km/h | 23,72 s | 37,54 s |
| 400 m standing start | 14,36 s | 15,64 s |
| 1,000 m standing start | 25,91 s | 28,69 s |
| Top speed | 243 km/h | 236 km/h |
Manufacturer technical specifications. The power-to-weight ratio is the key physical factor in a drag race.
| Characteristic | Value | Detail |
|---|---|---|
| Power | 224 hp | 4 cyl |
| Torque | 310 Nm | |
| Weight | 1 400 kg | manufacturer kerb weight |
| Drivetrain | - | |
| Gearbox | 8-speed Steptronic |
| Characteristic | Value | Detail |
|---|---|---|
| Power | 190 hp | 4 cyl |
| Torque | 400 Nm | |
| Weight | 1 775 kg | manufacturer kerb weight |
| Drivetrain | - | |
| Gearbox | Eight-speed Steptronic transmission |
Off the line, the Bmw 125i hits 100 km/h in 6.15 s versus 7.75 s for the Bmw 420d Convertible. At this point, the Bmw 125i leads by 1.60 s and sits roughly 4 m ahead.
At 200 metres, the Bmw 125i is doing 131 km/h against 116 km/h for the Bmw 420d Convertible. The gap is 0.62 s. The challenger starts to claw back ground.
At 400 metres standing start, the Bmw 125i crosses the line in 14.35 s versus 15.64 s. The 1.29 s gap represents roughly 50 m of track - a gap visible to the naked eye.
Past 400 metres, the Bmw 125i continues to build its lead. At 600 metres, it runs at 182 km/h versus 161 km/h. At 1,000 metres, the Bmw 125i finishes in 25.91 s versus 28.69 s, with a 2.78 s lead. Both vehicles have similar top speeds (243 vs 236 km/h), preventing any comeback.
Both rivals are electronically governed, but not at the same level: the Bmw 125i is capped at 243 km/h, the Bmw 420d Convertible at 236 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 (6.25 kg/hp vs 9.34 kg/hp) and transmission (Automatic vs Automatic).
In European road use (130 km/h max), both vehicles reach the legal speed limit in under 12.82 seconds. The 1.60 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.
Over 0–100 km/h, 125i F20LCI wins (6,15 s vs 7,75 s).
125i F20LCI goes from 0 to 100 km/h in 6,15 seconds (calibrated simulation).
125i F20LCI: 224 hp, ratio 6,25 kg/hp. 420d Convertible G22: 190 hp, ratio 9,34 kg/hp.
125i F20LCI: 243 km/h. 420d Convertible G22: 236 km/h.