Alfa Romeo Giulia Quadrifoglio vs Porsche 911 Carrera 4S Cabriolet 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 97%Calibrated physics simulation: SCx via VMax, power curves, Crr via WLTP, drivetrain losses. Manufacturer 0-100 is the calibration target. Confidence 97 %.
Giulia Quadrifoglio vs 911 Carrera 4S Cabriolet: chronicle of a drag race at 307 km/h
The launch: 0 to 100 km/h
Off the line, the Giulia Quadrifoglio hits 100 km/h in 3.93 s versus 4.05 s for the 911 Carrera 4S Cabriolet. The 0.12 s gap is negligible: both vehicles are neck and neck.
From 100 km/h to 400 metres
At 200 metres, the Giulia Quadrifoglio is doing 164 km/h against 158 km/h for the 911 Carrera 4S Cabriolet. The gap is 0.11 s. The gap remains stable from the start.
At 400 metres standing start, the Giulia Quadrifoglio crosses the line in 11.73 s versus 11.98 s. The 0.25 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 Giulia Quadrifoglio continues to build its lead. At 600 metres, it runs at 228 km/h versus 220 km/h. At 1,000 metres, the Giulia Quadrifoglio finishes in 20.92 s versus 21.53 s, with a 0.61 s lead. Both vehicles have similar top speeds (307 vs 303 km/h), preventing any comeback.
What the numbers don’t tell you
Both rivals are electronically governed, but not at the same level: the Giulia Quadrifoglio is capped at 307 km/h, the 911 Carrera 4S Cabriolet at 303 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 (3.10 kg/hp vs 3.66 kg/hp) and transmission (Automatic vs Automatic).
In European road use (130 km/h max), both vehicles reach the legal speed limit in under 5.85 seconds. The 0.12 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.
Alfa Romeo Giulia Quadrifoglio is slightly faster than the Porsche 911 Carrera 4S Cabriolet to 100 km/h. The edge holds on standing starts but may narrow at higher speeds depending on aerodynamic load.