Audi RS Q8 SUV vs Porsche 718 Cayman GT4 RS : which one is faster?

The launch: 0 to 100 km/h

Off the line, the 718 Cayman GT4 RS hits 100 km/h in 3.35 s versus 3.87 s for the RS Q8 SUV. At this point, the 718 Cayman GT4 RS leads by 0.52 s and sits roughly 5 m ahead.

From 100 km/h to 400 metres

At 200 metres, the 718 Cayman GT4 RS is doing 170 km/h against 156 km/h for the RS Q8 SUV. The gap is 0.50 s. The gap remains stable from the start.

At 400 metres standing start, the 718 Cayman GT4 RS crosses the line in 11.05 s versus 11.88 s. The 0.82 s gap represents roughly 44 m of track — a gap visible to the naked eye.

Beyond 400 metres: top speed comes into play

Past 400 metres, the 718 Cayman GT4 RS continues to build its lead. At 600 metres, it runs at 237 km/h versus 217 km/h. At 1,000 metres, the 718 Cayman GT4 RS finishes in 19.94 s versus 21.56 s, with a 1.62 s lead.

What the numbers don’t tell you

Electronically capped at 250 km/h, the RS Q8 SUV never reaches its natural aerodynamic ceiling in this duel. That’s not a physical limit of the motor — it’s a deliberate manufacturer decision, typically tied to standard-fit tyre ratings or model-range positioning.

With two combustion powertrains, the difference comes down to power-to-weight ratio (3.86 kg/hp vs 2.93 kg/hp) and transmission (Automatic vs Automatic).

In European road use (130 km/h max), both vehicles reach the legal speed limit in under 5.66 seconds. The 0.52 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.