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A120dDieselvsB120iPetrol
  • MotorwayMotorwayRange and charging
  • PerformancePerformance0-100, top speed
  • ConsumptionConsumptionYearly cost
  • Specs120d · 120i

BMW 120d xDrive F40 vs BMW 120i F40: which is truly faster?

Simulated drag race 0 → 1,000 m in real time. Synchronised speed counters and stopwatch. Physics calibration on 7 manufacturer measurements.

compact · 2020 vs 2020 · Methodology
BMWDiesel

120d xDrive F40

190 hp · 400 Nm · 1,515 kg · 2020

VS
BMWPetrolFaster

120i F40

178 hp · 280 Nm · 1,390 kg · 2020

Result · 0–100 km/h

ABMW 120d xDrive F40

7.13 s

Gap0.23 sin favour of 120i
BBMW 120i F40

6.90 s

Summary · Caralogy simulation
Measure120d xDrive F40120i F40Gap
0–100 km/h7.13 s6.90 s0.23 s · 120i F40
400 m standing start15.21 s15.01 s0.20 s · 120i F40
1,000 m standing start28.00 s27.23 s0.77 s · 120i F40
Top speed (electronically limited)228 km/h235 km/h7 km/h · 120i F40
Power-to-weight ratio7.97 kg/hp7.81 kg/hpbetter ratio · 120i F40

Watch the race

Standing-start drag race, calibrated on manufacturer splits. The gap shows at each stage.

BMWDiesel120d xDrive F40
Speed
0km/h
Timer
0,00s
Distance
0m
BMWPetrol120i F40
Speed
0km/h
Timer
0,00s
Distance
0m
100 m
200 m
300 m
400 m
500 m
600 m
700 m
800 m
900 m
1000 m
0m → 1000m
Gap0m

Stage-by-stage comparison

Simulated performance at each stage. Best value in bold.
Stage120d xDrive F40120i F40
0–30 km/h1.50 s1.65 s
0–50 km/h2.54 s2.77 s
0–80 km/h4.93 s4.88 s · tight gap
0–100 km/h7.13 s6.90 s
0–120 km/h9.98 s9.30 s
0–160 km/h18.51 s16.47 s
0–200 km/h35.95 s29.09 s
400 m standing start15.21 s15.01 s
1,000 m standing start28.00 s27.23 s
Top speed228 km/h235 km/h

Parameters and assumptions

Simulation

Start
Standing, straight line
Surface
Dry asphalt, 23°C
Wind
None
Driver
1 person, 75 kg

Calibration

Splits
0–100, 0–200 manufacturer
Power curve
Real measurement (Caralogy)
VMax
Manufacturer limited
Transmission
Losses integrated in model

Physics model calibrated on manufacturer splits. The limited top speed is not the real aerodynamic top speed of the vehicles.

Under the bonnet

Manufacturer technical specifications. The power-to-weight ratio is the key physical factor in a drag race.

BMW

120d xDrive F40

7,97kg/hpcompensated by −125 kg
CharacteristicValueDetail
Power190 hp4 cyl
Torque400 Nm
Weight1 515 kgmanufacturer kerb weight
DrivetrainIntegrale (AWD)
Gearbox8-speed Steptronic transmission
BMW

120i F40

7,81kg/hpratio better by 0,16 kg/hp
CharacteristicValueDetail
Power178 hp4 cyl
Torque280 Nm
Weight1 390 kgmanufacturer kerb weight
Drivetrain-
GearboxSeven-speed Steptronic dual-clutch transmission

The start: 0 to 100 km/h

Off the line, the 120i hits 100 km/h in 6.90 s versus 7.13 s for the 120d xDrive. Despite the faster sprint time, the 120d xDrive is 2 m further along the track at this moment: stronger low-speed acceleration offsets a slower run beyond 100 km/h.

From 100 km/h to 400 metres

At 200 metres, the 120i is doing 123 km/h against 119 km/h for the 120d xDrive. The gap is 0.01 s. The challenger starts to claw back ground.

At 400 metres standing start, the 120i crosses the line in 15.01 s versus 15.21 s. The 0.20 s gap represents roughly 8 m of track - barely a car length.

Beyond 400 metres: top speed comes into play

Past 400 metres, the 120i continues to build its lead. At 600 metres, it runs at 172 km/h versus 164 km/h. At 1,000 metres, the 120i finishes in 27.23 s versus 27.99 s, with a 0.77 s lead. Both vehicles have similar top speeds (228 vs 235 km/h), preventing any comeback.

What the numbers don’t tell you

Both rivals are electronically governed, but not at the same level: the 120d xDrive is capped at 230 km/h, the 120i at 235 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 (7.97 kg/hp vs 7.81 kg/hp) and transmission (Automatic vs Automatic).

In European road use (130 km/h max), both vehicles reach the legal speed limit in under 11.69 seconds. The 0.23 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.

Compare with other alternatives

Swap one of the two models to explore an equivalent duel in the same segment.

Instead of 120d xDrive F40
Audi A3 allstreetAudi A3 Sportback TFSI quattro S tronic 150 kWAudi A3 allstreet

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A3 Sedan vs 120i

Frequently asked questions

Over 0–100 km/h, 120i F40 wins (6,90 s vs 7,13 s).

120d xDrive F40 goes from 0 to 100 km/h in 7,13 seconds (calibrated simulation).

120d xDrive F40: 190 hp, ratio 7,97 kg/hp. 120i F40: 178 hp, ratio 7,81 kg/hp.

120d xDrive F40: 228 km/h. 120i F40: 235 km/h.