Over 0–100 km/h, A4 40 TDI and 420i xDrive G22 are neck and neck (7,74 s vs 7,79 s, no significant gap).
Simulated drag race 0 → 1,000 m in real time. Synchronised speed counters and stopwatch. Physics calibration on 7 manufacturer measurements.
| Measure | A4 40 TDI | 420i xDrive G22 | Gap |
|---|---|---|---|
| 0–100 km/h | 7.79 s | 7.74 s | 0.05 s · 420i xDrive G22 |
| 400 m standing start | 15.77 s | 15.61 s | 0.16 s · 420i xDrive G22 |
| 1,000 m standing start | 28.09 s | 28.72 s | 0.63 s · A4 40 TDI |
| Top speed (electronically limited) | 242 km/h | 234 km/h | 8 km/h · A4 40 TDI |
| Power-to-weight ratio | 8.29 kg/hp | 8.64 kg/hp | better ratio · A4 40 TDI |
Standing-start drag race, calibrated on manufacturer splits. The gap shows at each stage.
| Stage | A4 40 TDI | 420i xDrive G22 |
|---|---|---|
| 0–30 km/h | 2.16 s | 1.38 s |
| 0–50 km/h | 3.61 s | 2.58 s |
| 0–80 km/h | 5.84 s | 5.26 s |
| 0–100 km/h | 7.79 s | 7.74 s · tight gap |
| 0–120 km/h | 10.28 s | 10.94 s |
| 0–160 km/h | 17.57 s | 20.29 s |
| 0–200 km/h | 30.63 s | 38.25 s |
| 400 m standing start | 15.77 s | 15.61 s |
| 1,000 m standing start | 28.09 s | 28.72 s |
| Top speed | 242 km/h | 234 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 | 190 hp | Pending |
| Torque | 400 Nm | |
| Weight | 1 575 kg | manufacturer kerb weight |
| Drivetrain | Traction | |
| Gearbox | 7-speed S tronic |
| Characteristic | Value | Detail |
|---|---|---|
| Power | 184 hp | Pending |
| Torque | 300 Nm | |
| Weight | 1 590 kg | manufacturer kerb weight |
| Drivetrain | Integrale (AWD) | |
| Gearbox | Eight-speed Steptronic transmission |
Off the line, the 420i xDrive hits 100 km/h in 7.74 s versus 7.79 s for the A4 40 TDI. The 0.05 s gap is negligible: both vehicles are neck and neck.
At 200 metres, the 420i xDrive is doing 115 km/h against 122 km/h for the A4 40 TDI. The gap is 0.50 s. The gap widens compared to the 0-100.
At 400 metres standing start, the 420i xDrive crosses the line in 15.61 s versus 15.77 s. The 0.16 s gap represents roughly 7 m of track - barely a car length.
Past 400 metres, the situation changes. The 420i xDrive maxes out at 234 km/h while the A4 40 TDI keeps accelerating towards 242 km/h. At 600 metres, the gap has dropped to 0.13 s.
Around 509 metres, both vehicles are level. This is the inversion point: the A4 40 TDI overcomes its launch deficit thanks to a 8 km/h higher top speed.
At 1,000 metres, the A4 40 TDI finishes in 28.08 s versus 28.71 s. The 0.63 s delta in favour of the A4 40 TDI shows that top speed makes a clear difference.
On paper, the A4 40 TDI combines 190 hp, 400 Nm and 1,575 kg - a clear theoretical edge over the 420i xDrive. Yet the 420i xDrive launches quicker. At standstill, both motors deliver peak torque from 0 rpm: the decisive factor is no longer raw power, but available grip. If the 420i xDrive has a better traction coefficient (tyres, weight distribution, traction control calibration), it puts down more force despite inferior specs - exactly what the simulation reflects, calibrated on manufacturer 0-100 km/h times.
The 420i xDrive features all-wheel drive (AWD) against the A4 40 TDI’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.
Electronically capped at 238 km/h, the 420i xDrive 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 (8.29 kg/hp vs 8.64 kg/hp) and transmission (Automatic vs Automatic).
In European road use (130 km/h max), both vehicles reach the legal speed limit in under 12.85 seconds. The 0.05 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.
Swap one of the two models to explore an equivalent duel in the same segment.
Over 0–100 km/h, A4 40 TDI and 420i xDrive G22 are neck and neck (7,74 s vs 7,79 s, no significant gap).
A4 40 TDI goes from 0 to 100 km/h in 7,79 seconds (calibrated simulation).
A4 40 TDI: 190 hp, ratio 8,29 kg/hp. 420i xDrive G22: 184 hp, ratio 8,64 kg/hp.
A4 40 TDI: 242 km/h. 420i xDrive G22: 234 km/h.