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AM2vsB840iPetrol
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  • SpecsM2 · 840i

BMW M2 G87 vs BMW 840i Convertible G15: 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 · 2023 vs 2021 · Methodology
BMWPetrolFaster

M2 G87

460 hp · 550 Nm · 1,730 kg · 2023

VS
BMWPetrol

840i Convertible G15

333 hp · 500 Nm · 1,840 kg · 2021

Result · 0–100 km/h

ABMW M2 G87

4.12 s

Gap1.46 sin favour of M2
BBMW 840i Convertible G15

5.57 s

Summary · Caralogy simulation
MeasureM2 G87840i Convertible G15Gap
0–100 km/h4.12 s5.57 s1.46 s · M2 G87
400 m standing start12.08 s13.79 s1.71 s · M2 G87
1,000 m standing start21.81 s24.82 s3.01 s · M2 G87
Top speed (electronically limited)285 km/h250 km/h35 km/h · M2 G87
Power-to-weight ratio3.76 kg/hp5.53 kg/hpbetter ratio · M2 G87

Watch the race

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

BMWPetrolM2 G87
Speed
0km/h
Timer
0,00s
Distance
0m
BMWPetrol840i Convertible G15
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.
StageM2 G87840i Convertible G15
0–30 km/h1.17 s1.54 s
0–50 km/h1.95 s2.50 s
0–80 km/h3.06 s4.11 s
0–100 km/h4.12 s5.57 s
0–120 km/h5.26 s7.39 s
0–160 km/h8.46 s12.34 s
0–200 km/h13.14 s19.98 s
400 m standing start12.08 s13.79 s
1,000 m standing start21.81 s24.82 s
Top speed limited285 km/h250 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

M2 G87

3,76kg/hpratio better by 1,76 kg/hp
CharacteristicValueDetail
Power460 hpPending
Torque550 Nm
Weight1 730 kgmanufacturer kerb weight
DrivetrainPropulsion
Gearbox8-speed M Steptronic
BMW

840i Convertible G15

5,53kg/hpcompensated by −110 kg
CharacteristicValueDetail
Power333 hp6 cyl
Torque500 Nm
Weight1 840 kgmanufacturer kerb weight
Drivetrain-
Gearbox8-speed Steptronic

The start: 0 to 100 km/h

Off the line, the M2 hits 100 km/h in 4.12 s versus 5.57 s for the 840i Convertible. At this point, the M2 leads by 1.46 s and sits roughly 13 m ahead.

From 100 km/h to 400 metres

At 200 metres, the M2 is doing 155 km/h against 136 km/h for the 840i Convertible. The gap is 1.12 s. The challenger starts to claw back ground.

At 400 metres standing start, the M2 crosses the line in 12.08 s versus 13.79 s. The 1.71 s gap represents roughly 78 m of track - a gap visible to the naked eye.

Beyond 400 metres: top speed comes into play

Past 400 metres, the M2 continues to build its lead. At 600 metres, it runs at 215 km/h versus 190 km/h. At 1,000 metres, the M2 finishes in 21.80 s versus 24.82 s, with a 3.02 s lead.

What the numbers don’t tell you

Both rivals are electronically governed, but not at the same level: the M2 is capped at 285 km/h, the 840i Convertible at 250 (i.e. 155 mph - industry threshold) 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 (3.76 kg/hp vs 5.53 kg/hp) and transmission (Automatic vs Automatic).

In European road use (130 km/h max), both vehicles reach the legal speed limit in under 8.44 seconds. The 1.46 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.

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Frequently asked questions

Over 0–100 km/h, M2 G87 wins (4,12 s vs 5,57 s).

M2 G87 goes from 0 to 100 km/h in 4,12 seconds (calibrated simulation).

M2 G87: 460 hp, ratio 3,76 kg/hp. 840i Convertible G15: 333 hp, ratio 5,53 kg/hp.

M2 G87: 285 km/h. 840i Convertible G15: 250 km/h.