BMW iX xDrive50 I20 vs BMW X4 M40i G02: which is truly faster?

Off the line, the iX xDrive50 hits 100 km/h in 4.69 s versus 4.76 s for the X4 M40i. The instant torque of 765 Nm from the electric motor makes the difference. The 0.07 s gap is negligible: both vehicles are neck and neck.

At 200 metres, the iX xDrive50 is doing 144 km/h against 143 km/h for the X4 M40i. The gap is 0.03 s. The gap remains stable from the start.

At 400 metres standing start, the iX xDrive50 crosses the line in 12.93 s versus 12.99 s. The 0.07 s gap represents roughly 3 m of track - barely a car length.

Past 400 metres, the situation changes. The iX xDrive50 maxes out at 200 km/h while the X4 M40i keeps accelerating towards 250 (i.e. 155 mph - industry threshold) km/h. At 600 metres, the gap has dropped to 0.10 s.

Around 798 metres, both vehicles are level. This is the inversion point: the X4 M40i overcomes its launch deficit thanks to a 50 km/h higher top speed.

At 1,000 metres, the X4 M40i finishes in 23.60 s versus 23.92 s. The 0.32 s delta shows an extremely tight race.

Both rivals are electronically governed, but not at the same level: the iX xDrive50 is capped at 200 km/h, the X4 M40i at 250 (i.e. 155 mph - industry threshold) 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.

Instant electric torque gives an advantage off the line. The higher top speed of the combustion engine gives an advantage over longer distances. The distance at which one catches the other depends on the top speed differential.

In European road use (130 km/h max), both vehicles reach the legal speed limit in under 7.22 seconds. The 0.07 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.