Tesla Model X Long Range vs Alfa Romeo Stelvio Quadrifoglio: which is truly faster?

Off the line, the Stelvio Quadrifoglio hits 100 km/h in 3.83 s versus 4.11 s for the Model X Long Range. Despite lacking instant torque, 510 hp of power compensates. At this point, the Stelvio Quadrifoglio leads by 0.28 s and sits roughly 7 m ahead.

At 200 metres, the Stelvio Quadrifoglio is doing 156 km/h against 160 km/h for the Model X Long Range. The gap is 0.17 s. The challenger starts to claw back ground.

At 400 metres standing start, the Stelvio Quadrifoglio crosses the line in 11.86 s versus 11.92 s. The 0.06 s gap represents roughly 3 m of track - barely a car length.

Past 400 metres, the situation changes. The Model X Long Range maxes out at 250 (i.e. 155 mph - industry threshold) km/h while the Stelvio Quadrifoglio keeps accelerating towards 283 km/h. At 600 metres, the gap has dropped to 0.05 s.

Around 510 metres, both vehicles are level. This is the inversion point: the Model X Long Range overcomes its launch deficit thanks to a 33 km/h higher top speed.

At 1,000 metres, the Model X Long Range finishes in 21.31 s versus 21.59 s. The 0.28 s delta shows an extremely tight race.

Both rivals are electronically governed, but not at the same level: the Model X Long Range is capped at 249 (i.e. 155 mph - industry threshold) km/h, the Stelvio Quadrifoglio at 283 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 5.66 seconds. The 0.28 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.