Alfa Romeo Giulia 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 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 Targa 4 GTS: 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 4.27 s for the 911 Targa 4 GTS. At this point, the Giulia Quadrifoglio leads by 0.34 s and sits roughly 2 m ahead.
From 100 km/h to 400 metres
At 200 metres, the Giulia Quadrifoglio is doing 164 km/h against 155 km/h for the 911 Targa 4 GTS. The gap is 0.24 s. The gap remains stable from the start.
At 400 metres standing start, the Giulia Quadrifoglio crosses the line in 11.73 s versus 12.12 s. The 0.39 s gap represents roughly 21 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 221 km/h. At 1,000 metres, the Giulia Quadrifoglio finishes in 20.92 s versus 21.61 s, with a 0.69 s lead. Both vehicles have similar top speeds (307 vs 302 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 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 (3.10 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 0.34 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 Targa 4 GTS to 100 km/h. The edge holds on standing starts but may narrow at higher speeds depending on aerodynamic load.