Over 0–100 km/h, 840i Convertible G15 wins (5,57 s vs 6,27 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.
| 840i Convertible G15 | 128ti F40 | |
|---|---|---|
| 0–100 km/h | 5,57 s−0,70 s | 6,27 s |
| 400 m standing start | 13,79 s−0,65 s | 14,44 s |
| 1,000 m standing start | 24,82 s−1,05 s | 25,87 s |
| Top speed (electronically limited) | 250 km/h | 250 km/h |
| Power-to-weight ratio | 5,53 kg/hp | 5,45 kg/hpbetter ratio |
Standing-start drag race, calibrated on manufacturer splits. The gap shows at each stage.
Simulated performance at each stage. Winner in green.
| Palier | 840i Convertible G15 | 128ti F40 |
|---|---|---|
| 0–30 km/h | 1,54 s | 1,81 s |
| 0–50 km/h | 2,50 s | 3,01 s |
| 0–80 km/h | 4,11 s | 4,76 s |
| 0–100 km/h | 5,57 s | 6,27 s |
| 0–120 km/h | 7,39 s | 8,20 s |
| 0–160 km/h | 12,34 s | 13,63 s |
| 0–200 km/h | 19,98 s | 22,97 s |
| 400 m standing start | 13,79 s | 14,44 s |
| 1,000 m standing start | 24,82 s | 25,87 s |
| Top speed limited | 250 km/h | 250 km/h |
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 | 265 hp | 4 cyl |
| Torque | 400 Nm | |
| Weight | 1 445 kg | manufacturer kerb weight |
| Drivetrain | - | |
| Gearbox | Eight-speed Steptronic Sport transmission |
Off the line, the Bmw 840i Convertible hits 100 km/h in 5.57 s versus 6.27 s for the Bmw 128ti. At this point, the Bmw 840i Convertible leads by 0.70 s and sits roughly 11 m ahead.
At 200 metres, the Bmw 840i Convertible is doing 136 km/h against 132 km/h for the Bmw 128ti. The gap is 0.52 s. The challenger starts to claw back ground.
At 400 metres standing start, the Bmw 840i Convertible crosses the line in 13.79 s versus 14.44 s. The 0.65 s gap represents roughly 29 m of track - two to three car lengths.
Past 400 metres, the Bmw 840i Convertible continues to build its lead. At 600 metres, it runs at 190 km/h versus 184 km/h. At 1,000 metres, the Bmw 840i Convertible finishes in 24.82 s versus 25.86 s, with a 1.05 s lead. Both vehicles have similar top speeds (250 (i.e. 155 mph - industry threshold) vs 250 (i.e. 155 mph - industry threshold) km/h), preventing any comeback.
Both rivals share the same electronic speed cap: the Bmw 840i Convertible and the Bmw 128ti are governed to 250 (i.e. 155 mph - industry threshold) km/h. At that speed, standard-fit tyres approach their safety threshold - an industrial ceiling common to most electric vehicles in this segment. Neither car shows its true aerodynamic potential in this duel.
With two combustion powertrains, the difference comes down to power-to-weight ratio (5.53 kg/hp vs 5.45 kg/hp) and transmission (Automatic vs Automatic).
In European road use (130 km/h max), both vehicles reach the legal speed limit in under 9.33 seconds. The 0.70 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.
Over 0–100 km/h, 840i Convertible G15 wins (5,57 s vs 6,27 s).
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. 128ti F40: 265 hp, ratio 5,45 kg/hp.
840i Convertible G15: 250 km/h. 128ti F40: 250 km/h.