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Home›Duel›Porsche 2020 911 vs BMW Z4

Performance comparison

Porsche 2020 911 Carrera S Cabriolet 992 vs BMW Z4 M40i G29: 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.

PorschePetrolFaster

2020 911 Carrera S Cabriolet 992

449 hp · 529 Nm · 1,604 kg · 2019

VS
BMWPetrol

Z4 M40i G29

340 hp · 500 Nm · 1,535 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.

2020 911 Carrera S Cabriolet 992Z4 M40i G29
0–100 km/h3,63 s−0,91 s4,54 s
400 m standing start11,59 s−1,11 s12,70 s
1,000 m standing start21,03 s−1,92 s22,95 s
Top speed (electronically limited)306 km/h+56 km/h250 km/h
Power-to-weight ratio3,57 kg/hpbetter ratio4,51 kg/hp

Watch the race

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

PorschePetrol2020 911 Carrera S Cabriolet 992
Speed
0km/h
Timer
0,00s
Distance
0m
BMWPetrolZ4 M40i G29
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.

Palier2020 911 Carrera S Cabriolet 992Z4 M40i G29
0–30 km/h1,03 s1,27 s
0–50 km/h1,71 s2,12 s
0–80 km/h2,73 s3,42 s
0–100 km/h3,63 s4,54 s
0–120 km/h4,67 s5,95 s
0–160 km/h7,52 s9,74 s
0–200 km/h11,68 s15,46 s
400 m standing start11,59 s12,70 s
1,000 m standing start21,03 s22,95 s
Top speed limited306 km/h250 km/h

Under the bonnet

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

Porsche

2020 911 Carrera S Cabriolet 992

3,57kg/hpratio better by 0,94 kg/hp
CharacteristicValueDetail
Power449 hpB6
Torque529 Nm
Weight1 604 kgmanufacturer kerb weight
DrivetrainPropulsion
GearboxDUAL_CLUTCH
BMW

Z4 M40i G29

4,51kg/hpcompensated by −69 kg
CharacteristicValueDetail
Power340 hp6 cyl
Torque500 Nm
Weight1 535 kgmanufacturer kerb weight
DrivetrainZ4 M40i
GearboxEight-speed Steptronic transmission

The start: 0 to 100 km/h

Off the line, the 2020 911 Carrera S Cabriolet hits 100 km/h in 3.64 s versus 4.54 s for the Bmw Z4 M40i. At this point, the 2020 911 Carrera S Cabriolet leads by 0.91 s and sits roughly 10 m ahead.

From 100 km/h to 400 metres

At 200 metres, the 2020 911 Carrera S Cabriolet is doing 161 km/h against 147 km/h for the Bmw Z4 M40i. The gap is 0.76 s. The challenger starts to claw back ground.

At 400 metres standing start, the 2020 911 Carrera S Cabriolet crosses the line in 11.58 s versus 12.70 s. The 1.11 s gap represents roughly 55 m of track — a gap visible to the naked eye.

Beyond 400 metres: top speed comes into play

Past 400 metres, the 2020 911 Carrera S Cabriolet continues to build its lead. At 600 metres, it runs at 223 km/h versus 205 km/h. At 1,000 metres, the 2020 911 Carrera S Cabriolet finishes in 21.03 s versus 22.95 s, with a 1.92 s lead.

What the numbers don’t tell you

Both rivals are electronically governed, but not at the same level: the 2020 911 Carrera S Cabriolet is capped at 306 km/h, the Bmw Z4 M40i 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 (3.57 kg/hp vs 4.51 kg/hp) and transmission (Automatic vs Automatic).

In European road use (130 km/h max), both vehicles reach the legal speed limit in under 6.76 seconds. The 0.91 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 2020 911 Carrera S Cabriolet 992
Bmw M850i xDrive ConvertibleBmw M850i xDrive ConvertibleBmw M4 Competition Convertible
Instead of Z4 M40i G29
Porsche 911 Carrera 4S CabrioletPorsche 911 Carrera S CabrioletPorsche 911 Carrera Cabriolet

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Frequently asked questions

Sur 0–100 km/h, 2020 911 Carrera S Cabriolet 992 gagne (3,63 s vs 4,54 s).

2020 911 Carrera S Cabriolet 992 passe de 0 à 100 km/h en 3,63 secondes (simulation calibrée).

2020 911 Carrera S Cabriolet 992 : 449 hp, ratio 3,57 kg/hp. Z4 M40i G29 : 340 hp, ratio 4,51 kg/hp.

2020 911 Carrera S Cabriolet 992 : 306 km/h. Z4 M40i G29 : 250 km/h.