Alfa Romeo Giulia Quadrifoglio vs Porsche 911 Carrera 4S 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%The 911 Carrera reaches 100 km/h first (3.83 s vs 3.93 s), but the Giulia Quadrifoglio is ahead at every metre of the race. Explanation: the Giulia Quadrifoglio accelerates harder at low speed and builds a distance gap before either car hits 100 km/h.
Why this result?
The Porsche 911 Carrera 4S is faster at 0-100 km/h, but the Alfa Romeo Giulia Quadrifoglio compensates at high speed thanks to higher peak power or top speed. At 400 m, Alfa Romeo Giulia Quadrifoglio leads by 0.01 s.
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: chronicle of a drag race at 307 km/h
The launch: 0 to 100 km/h
Off the line, the 911 Carrera 4S hits 100 km/h in 3.83 s versus 3.93 s for the Giulia Quadrifoglio. The 0.10 s gap is negligible: both vehicles are neck and neck.
From 100 km/h to 400 metres
At 200 metres, the 911 Carrera 4S is doing 161 km/h against 164 km/h for the Giulia Quadrifoglio. The gap is 0.07 s. The gap remains stable from the start.
At 400 metres standing start, the Giulia Quadrifoglio crosses the line in 11.73 s versus 11.74 s. The 0.01 s gap represents roughly 0 m of track
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 223 km/h. At 1,000 metres, the Giulia Quadrifoglio finishes in 20.92 s versus 21.16 s, with a 0.24 s lead. Both vehicles have similar top speeds (307 vs 304 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 at 304 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 3.50 kg/hp) and transmission (Automatic vs Automatic).
In European road use (130 km/h max), both vehicles reach the legal speed limit in under 5.55 seconds. The 0.10 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.
Alfa Romeo Giulia Quadrifoglio and Porsche 911 Carrera 4S are virtually tied to 100 km/h. The gap is under a tenth of a second — only the physics engine can settle it step by step.