Over 0–100 km/h, A6 45 TFSI wins (6,33 s vs 6,58 s).
Simulated drag race 0 → 1,000 m in real time. Synchronised speed counters and stopwatch. Physics calibration on 7 manufacturer measurements.
| Measure | S90 B5 AWD | A6 45 TFSI | Gap |
|---|---|---|---|
| 0–100 km/h | 6.58 s | 6.33 s | 0.25 s · A6 45 TFSI |
| 400 m standing start | 14.76 s | 14.54 s | 0.22 s · A6 45 TFSI |
| 1,000 m standing start | 27.11 s | 26.24 s | 0.87 s · A6 45 TFSI |
| Top speed (electronically limited) | 180 km/h | 247 km/h | 67 km/h · A6 45 TFSI |
| Power-to-weight ratio | 7.18 kg/hp | 6.69 kg/hp | better ratio · A6 45 TFSI |
Standing-start drag race, calibrated on manufacturer splits. The gap shows at each stage.
| Stage | S90 B5 AWD | A6 45 TFSI |
|---|---|---|
| 0–30 km/h | 1.70 s | 1.65 s · tight gap |
| 0–50 km/h | 2.57 s | 2.75 s |
| 0–80 km/h | 4.64 s | 4.62 s · tight gap |
| 0–100 km/h | 6.58 s | 6.33 s |
| 0–120 km/h | 8.89 s | 8.51 s |
| 0–160 km/h | 15.63 s | 14.57 s |
| 0–200 km/h | - | 24.58 s |
| 400 m standing start | 14.76 s | 14.54 s |
| 1,000 m standing start | 27.11 s | 26.24 s |
| Top speed | 180 km/h | 247 km/h |
Physics model calibrated on manufacturer splits. The limited top speed is not the real aerodynamic top speed of the vehicles.
Manufacturer technical specifications. The power-to-weight ratio is the key physical factor in a drag race.
| Characteristic | Value | Detail |
|---|---|---|
| Power | 250 hp | Pending |
| Torque | 350 Nm | |
| Weight | 1 795 kg | manufacturer kerb weight |
| Drivetrain | Integrale (AWD) | |
| Gearbox | 8-speed Geartronic |
| Characteristic | Value | Detail |
|---|---|---|
| Power | 245 hp | Pending |
| Torque | 370 Nm | |
| Weight | 1 640 kg | manufacturer kerb weight |
| Drivetrain | Traction | |
| Gearbox | 7-speed S tronic |
Off the line, the A6 45 TFSI hits 100 km/h in 6.33 s versus 6.58 s for the S90 B5 AWD. The 0.25 s gap is negligible: both vehicles are neck and neck.
At 200 metres, the A6 45 TFSI is doing 128 km/h against 125 km/h for the S90 B5 AWD. The gap is 0.09 s. The challenger starts to claw back ground.
At 400 metres standing start, the A6 45 TFSI crosses the line in 14.54 s versus 14.75 s. The 0.22 s gap represents roughly 9 m of track - barely a car length.
Past 400 metres, the A6 45 TFSI continues to build its lead. At 600 metres, it runs at 180 km/h versus 176 km/h. At 1,000 metres, the A6 45 TFSI finishes in 26.23 s versus 27.11 s, with a 0.87 s lead.
The S90 B5 AWD features all-wheel drive (AWD) against the A6 45 TFSI’s FWD. At low speeds (0-30, 0-50, 0-80 km/h), AWD doubles the driven contact area: all four wheels transmit torque to the road, virtually eliminating wheelspin at launch. This traction advantage is decisive in the range where the motor delivers peak torque, before power and aerodynamics take over.
Both rivals are electronically governed, but not at the same level: the S90 B5 AWD is capped at 180 km/h, the A6 45 TFSI at 247 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 (7.18 kg/hp vs 6.69 kg/hp) and transmission (Automatic vs Automatic).
In European road use (130 km/h max), both vehicles reach the legal speed limit in under 10.37 seconds. The 0.25 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.
Over 0–100 km/h, A6 45 TFSI wins (6,33 s vs 6,58 s).
S90 B5 AWD goes from 0 to 100 km/h in 6,58 seconds (calibrated simulation).
S90 B5 AWD: 250 hp, ratio 7,18 kg/hp. A6 45 TFSI: 245 hp, ratio 6,69 kg/hp.
S90 B5 AWD: 180 km/h. A6 45 TFSI: 247 km/h.