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AM135iPetrolvsB120dDiesel
  • MotorwayMotorwayRange and charging
  • PerformancePerformance0-100, top speed
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  • SpecsM135i · 120d

BMW M135i xDrive F40 vs BMW 120d 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 · 2021 vs 2020 · Methodology
BMWPetrolFaster

M135i xDrive F40

306 hp · 450 Nm · 1,525 kg · 2021

VS
BMWDiesel

120d F40

190 hp · 400 Nm · 1,450 kg · 2020

Result · 0–100 km/h

ABMW M135i xDrive F40

4.78 s

Gap2.46 sin favour of M135i xDrive
BBMW 120d F40

7.24 s

Summary · Caralogy simulation
MeasureM135i xDrive F40120d F40Gap
0–100 km/h4.78 s7.24 s2.46 s · M135i xDrive F40
400 m standing start13.00 s15.38 s2.38 s · M135i xDrive F40
1,000 m standing start23.59 s27.75 s4.16 s · M135i xDrive F40
Top speed (electronically limited)250 km/h231 km/h19 km/h · M135i xDrive F40
Power-to-weight ratio4.98 kg/hp7.63 kg/hpbetter ratio · M135i xDrive F40

Watch the race

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

BMWPetrolM135i xDrive F40
Speed
0km/h
Timer
0,00s
Distance
0m
BMWDiesel120d 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.
StageM135i xDrive F40120d F40
0–30 km/h1.33 s2.04 s
0–50 km/h2.22 s3.17 s
0–80 km/h3.58 s5.28 s
0–100 km/h4.78 s7.24 s
0–120 km/h6.30 s9.77 s
0–160 km/h10.46 s17.19 s
0–200 km/h17.07 s31.43 s
400 m standing start13.00 s15.38 s
1,000 m standing start23.59 s27.75 s
Top speed limited250 km/h231 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

M135i xDrive F40

4,98kg/hpratio better by 2,65 kg/hp
CharacteristicValueDetail
Power306 hp4 cyl
Torque450 Nm
Weight1 525 kgmanufacturer kerb weight
DrivetrainIntegrale (AWD)
GearboxEight-speed Steptronic Sport transmission
BMW

120d F40

7,63kg/hpcompensated by −75 kg
CharacteristicValueDetail
Power190 hp4 cyl
Torque400 Nm
Weight1 450 kgmanufacturer kerb weight
Drivetrain-
Gearbox8-speed Steptronic transmission

The start: 0 to 100 km/h

Off the line, the M135i xDrive hits 100 km/h in 4.78 s versus 7.24 s for the 120d. At this point, the M135i xDrive leads by 2.46 s and sits roughly 22 m ahead.

From 100 km/h to 400 metres

At 200 metres, the M135i xDrive is doing 144 km/h against 123 km/h for the 120d. The gap is 1.62 s. The challenger starts to claw back ground.

At 400 metres standing start, the M135i xDrive crosses the line in 13.00 s versus 15.38 s. The 2.38 s gap represents roughly 97 m of track - a gap visible to the naked eye.

Beyond 400 metres: top speed comes into play

Past 400 metres, the M135i xDrive continues to build its lead. At 600 metres, it runs at 199 km/h versus 170 km/h. At 1,000 metres, the M135i xDrive finishes in 23.59 s versus 27.74 s, with a 4.16 s lead.

What the numbers don’t tell you

Both rivals are electronically governed, but not at the same level: the M135i xDrive is capped at 250 (i.e. 155 mph - industry threshold) km/h, the 120d at 231 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 (4.98 kg/hp vs 7.63 kg/hp) and transmission (Automatic vs Automatic).

In European road use (130 km/h max), both vehicles reach the legal speed limit in under 11.29 seconds. The 2.46 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.

Other duels you might be interested in

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Frequently asked questions

Over 0–100 km/h, M135i xDrive F40 wins (4,78 s vs 7,24 s).

M135i xDrive F40 goes from 0 to 100 km/h in 4,78 seconds (calibrated simulation).

M135i xDrive F40: 306 hp, ratio 4,98 kg/hp. 120d F40: 190 hp, ratio 7,63 kg/hp.

M135i xDrive F40: 250 km/h. 120d F40: 231 km/h.