BMW 430i xDrive Gran Coupé G22 vs BMW 420d F32: which is truly faster?

Off the line, the 420d hits 100 km/h in 7.04 s versus 7.79 s for the 430i xDrive Gran Coupé. At this point, the 420d leads by 0.75 s and sits roughly 26 m ahead.

At 200 metres, the 420d is doing 119 km/h against 124 km/h for the 430i xDrive Gran Coupé. The gap is 0.89 s. The gap remains stable from the start.

At 400 metres standing start, the 420d crosses the line in 15.10 s versus 15.75 s. The 0.65 s gap represents roughly 28 m of track - two to three car lengths.

Past 400 metres, the gap narrows. The 430i xDrive Gran Coupé maxes out at 235 km/h while the 420d keeps accelerating towards 240 km/h. At 600 metres, the gap is down to 0.43 s from 0.65 s at 400 metres.

At 1,000 metres, the 420d finishes in 27.77 s versus 27.85 s, with just 0.07 s to spare. The 430i xDrive Gran Coupé fails to fully close the launch gap.

Both rivals are electronically governed, but not at the same level: the 430i xDrive Gran Coupé is capped at 235 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 (6.94 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 0.75 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.