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Home›Duel›BMW 420d vs BMW 118d

Performance comparison

BMW 420d Convertible G22 vs BMW 118d F20LCI: 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.

BMWDieselFaster

420d Convertible G22

190 hp · 400 Nm · 1,775 kg · 2021

VS
BMWDiesel

118d F20LCI

150 hp · 320 Nm · 1,395 kg · 2018

MotorwayRange & chargingPerformance0-100, top speedConsumptionAnnual TCO

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.

420d Convertible G22118d F20LCI
0–100 km/h7,75 s−0,76 s8,51 s
400 m standing start15,64 s−0,63 s16,27 s
1,000 m standing start28,69 s−0,93 s29,62 s
Top speed (electronically limited)236 km/h+24 km/h212 km/h
Power-to-weight ratio9,34 kg/hp9,30 kg/hpbetter ratio

Watch the race

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

BMWDiesel420d Convertible G22
Speed
0km/h
Timer
0,00s
Distance
0m
BMWDiesel118d F20LCI
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. Winner in green.

Palier420d Convertible G22118d F20LCI
0–30 km/h1,52 s2,00 s
0–50 km/h2,64 s3,28 s
0–80 km/h5,29 s5,95 s
0–100 km/h7,75 s8,51 s
0–120 km/h10,87 s11,72 s
0–160 km/h20,11 s21,88 s
0–200 km/h37,54 s47,74 s
400 m standing start15,64 s16,27 s
1,000 m standing start28,69 s29,62 s
Top speed236 km/h212 km/h

Under the bonnet

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

BMW

420d Convertible G22

9,34kg/hpcompensated by −380 kg
CharacteristicValueDetail
Power190 hp4 cyl
Torque400 Nm
Weight1 775 kgmanufacturer kerb weight
Drivetrain-
GearboxEight-speed Steptronic transmission
BMW

118d F20LCI

9,30kg/hpratio better by 0,04 kg/hp
CharacteristicValueDetail
Power150 hp4 cyl
Torque320 Nm
Weight1 395 kgmanufacturer kerb weight
Drivetrain-
Gearbox6-speed manual (8-speed Steptronic)

The start: 0 to 100 km/h

Off the line, the Bmw 420d Convertible hits 100 km/h in 7.75 s versus 8.51 s for the Bmw 118d. At this point, the Bmw 420d Convertible leads by 0.76 s and sits roughly 14 m ahead.

From 100 km/h to 400 metres

At 200 metres, the Bmw 420d Convertible is doing 116 km/h against 114 km/h for the Bmw 118d. The gap is 0.56 s. The challenger starts to claw back ground.

At 400 metres standing start, the Bmw 420d Convertible crosses the line in 15.64 s versus 16.27 s. The 0.63 s gap represents roughly 24 m of track - two to three car lengths.

Beyond 400 metres: top speed comes into play

Past 400 metres, the Bmw 420d Convertible continues to build its lead. At 600 metres, it runs at 161 km/h versus 158 km/h. At 1,000 metres, the Bmw 420d Convertible finishes in 28.69 s versus 29.61 s, with a 0.93 s lead.

What the numbers don’t tell you

Both rivals are electronically governed, but not at the same level: the Bmw 420d Convertible is capped at 236 km/h, the Bmw 118d at 212 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 (9.34 kg/hp vs 9.30 kg/hp) and transmission (Automatic vs Automatic).

In European road use (130 km/h max), both vehicles reach the legal speed limit in under 13.72 seconds. The 0.76 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 420d Convertible G22
Bmw 420i ConvertibleBmw 220d ConvertibleBmw 218i Convertible
Instead of 118d F20LCI
Audi A1 Sportback 35 TFSI S tronic 110 kWAudi A3 Sportback TFSI 110 kWAudi A3 Sportback

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Frequently asked questions

Sur 0–100 km/h, 420d Convertible G22 gagne (7,75 s vs 8,51 s).

420d Convertible G22 passe de 0 à 100 km/h en 7,75 secondes (simulation calibrée).

420d Convertible G22 : 190 hp, ratio 9,34 kg/hp. 118d F20LCI : 150 hp, ratio 9,30 kg/hp.

420d Convertible G22 : 236 km/h. 118d F20LCI : 212 km/h.