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Porsche 911 Carrera Cabriolet 991.2 vs BMW i8 Roadster I12: 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.

sports car · 2017 vs 2018 · Methodology
PorschePetrol

911 Carrera Cabriolet 991.2

375 hp · 449 Nm · 1,500 kg · 2017

VS
BMWPHEV

i8 Roadster I12

374 hp · 320 Nm · 1,595 kg · 2018

Donnée constructeur en cours de validation pour ce profil

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.

Porsche

911 Carrera Cabriolet 991.2

4,00kg/hpratio better by 0,26 kg/hp
CharacteristicValueDetail
Power375 hpB6
Torque449 Nm
Weight1 500 kgmanufacturer kerb weight
DrivetrainPropulsion
GearboxDUAL_CLUTCH
BMW

i8 Roadster I12

4,26kg/hpcompensated by −95 kg
CharacteristicValueDetail
Power374 hpPending
Torque320 Nm
Weight1 595 kgmanufacturer kerb weight
DrivetrainPropulsion
Gearbox6-speed automatic

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911 Carrera Cabriolet vs Z4 sDrive30i

Frequently asked questions

See the simulation above.

911 Carrera Cabriolet 991.2 goes from 0 to 100 km/h in 4,42 seconds (calibrated simulation).

911 Carrera Cabriolet 991.2: 375 hp, ratio 4,00 kg/hp. i8 Roadster I12: 374 hp, ratio 4,26 kg/hp.

911 Carrera Cabriolet 991.2: 286 km/h. i8 Roadster I12: 250 km/h.