Alfa Romeo Stelvio Quadrifoglio vs Porsche 911 Targa 4 GTS 991.2 : which one is faster?
0-100 km/h, 400 m, 1000 m, top speed — physics simulation calibrated on 7 measures.
Simulation de performance
Race simulation at real speed
CONFIDENCE 96%Calibrated physics simulation: SCx via VMax, power curves, Crr via WLTP, drivetrain losses. Manufacturer 0-100 is the calibration target. Confidence 96 %.
Stelvio Quadrifoglio vs 911 Targa 4 GTS: chronicle of a drag race at 302 km/h
The launch: 0 to 100 km/h
Off the line, the Stelvio Quadrifoglio hits 100 km/h in 3.83 s versus 4.27 s for the 911 Targa 4 GTS. At this point, the Stelvio Quadrifoglio leads by 0.43 s and sits roughly 6 m ahead.
From 100 km/h to 400 metres
At 200 metres, the Stelvio Quadrifoglio is doing 156 km/h against 155 km/h for the 911 Targa 4 GTS. The gap is 0.29 s. The challenger starts to claw back ground.
At 400 metres standing start, the Stelvio Quadrifoglio crosses the line in 11.86 s versus 12.12 s. The 0.26 s gap represents roughly 14 m of track — two to three car lengths.
Beyond 400 metres: top speed comes into play
Past 400 metres, the gap narrows. The Stelvio Quadrifoglio maxes out at 283 km/h while the 911 Targa 4 GTS keeps accelerating towards 302 km/h. At 600 metres, the gap has dropped to 0.19 s.
At 1,000 metres, the Stelvio Quadrifoglio finishes in 21.59 s versus 21.61 s, with just 0.02 s to spare. The 911 Targa 4 GTS fails to fully close the launch gap.
What the numbers don’t tell you
Both rivals are electronically governed, but not at the same level: the Stelvio Quadrifoglio is capped at 283 km/h, the 911 Targa 4 GTS at 302 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 (3.59 kg/hp vs 3.59 kg/hp) and transmission (Automatic vs Automatic).
In European road use (130 km/h max), both vehicles reach the legal speed limit in under 6.03 seconds. The 0.43 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.
Alfa Romeo Stelvio Quadrifoglio has a clear edge over the Porsche 911 Targa 4 GTS to 100 km/h. This difference is clearly noticeable in spirited driving and widens on standing starts.