Over 0–100 km/h, 840i Gran Coupe G15 wins (5,46 s vs 7,44 s).
Simulated drag race 0 → 1,000 m in real time. Synchronised speed counters and stopwatch. Physics calibration on 7 manufacturer measurements.
| Measure | 840i Gran Coupe G15 | 420i F32 | Gap |
|---|---|---|---|
| 0–100 km/h | 5.46 s | 7.44 s | 1.98 s · 840i Gran Coupe G15 |
| 400 m standing start | 13.70 s | 15.38 s | 1.68 s · 840i Gran Coupe G15 |
| 1,000 m standing start | 24.69 s | 28.23 s | 3.54 s · 840i Gran Coupe G15 |
| Top speed (electronically limited) | 250 km/h | 238 km/h | 12 km/h · 840i Gran Coupe G15 |
| Power-to-weight ratio | 5.45 kg/hp | 8.29 kg/hp | better ratio · 840i Gran Coupe G15 |
Standing-start drag race, calibrated on manufacturer splits. The gap shows at each stage.
| Stage | 840i Gran Coupe G15 | 420i F32 |
|---|---|---|
| 0–30 km/h | 1.50 s | 1.42 s · tight gap |
| 0–50 km/h | 2.46 s · tight gap | 2.53 s |
| 0–80 km/h | 4.03 s | 5.09 s |
| 0–100 km/h | 5.46 s | 7.44 s |
| 0–120 km/h | 7.25 s | 10.39 s |
| 0–160 km/h | 12.12 s | 19.05 s |
| 0–200 km/h | 19.69 s | 35.17 s |
| 400 m standing start | 13.70 s | 15.38 s |
| 1,000 m standing start | 24.69 s | 28.23 s |
| Top speed limited | 250 km/h | 238 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 | 1 815 kg | manufacturer kerb weight |
| Drivetrain | - | |
| Gearbox | 8-speed Steptronic |
| Characteristic | Value | Detail |
|---|---|---|
| Power | 184 hp | 4 cyl |
| Torque | 300 Nm | |
| Weight | 1 525 kg | manufacturer kerb weight |
| Drivetrain | - | |
| Gearbox | Eight-speed Steptronic transmission |
Off the line, the 840i Gran Coupe hits 100 km/h in 5.46 s versus 7.44 s for the 420i. At this point, the 840i Gran Coupe leads by 1.98 s and sits roughly 8 m ahead.
At 200 metres, the 840i Gran Coupe is doing 137 km/h against 117 km/h for the 420i. The gap is 0.91 s. The challenger starts to claw back ground.
At 400 metres standing start, the 840i Gran Coupe crosses the line in 13.69 s versus 15.38 s. The 1.69 s gap represents roughly 66 m of track - a gap visible to the naked eye.
Past 400 metres, the 840i Gran Coupe continues to build its lead. At 600 metres, it runs at 191 km/h versus 163 km/h. At 1,000 metres, the 840i Gran Coupe finishes in 24.68 s versus 28.23 s, with a 3.55 s lead. Both vehicles have similar top speeds (250 (i.e. 155 mph - industry threshold) vs 238 km/h), preventing any comeback.
Both rivals are electronically governed, but not at the same level: the 840i Gran Coupe is capped at 250 (i.e. 155 mph - industry threshold) km/h, the 420i 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 (5.45 kg/hp vs 8.29 kg/hp) and transmission (Automatic vs Automatic).
In European road use (130 km/h max), both vehicles reach the legal speed limit in under 12.15 seconds. The 1.98 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.
Over 0–100 km/h, 840i Gran Coupe G15 wins (5,46 s vs 7,44 s).
840i Gran Coupe G15 goes from 0 to 100 km/h in 5,46 seconds (calibrated simulation).
840i Gran Coupe G15: 333 hp, ratio 5,45 kg/hp. 420i F32: 184 hp, ratio 8,29 kg/hp.
840i Gran Coupe G15: 250 km/h. 420i F32: 238 km/h.