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Porsche Boxster S vs BMW Z4 sDrive30i 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.

sports car · 2012 vs 2018 · Methodology
PorschePetrolFaster

Boxster S

314 hp · 361 Nm · 1,355 kg · 2012

VS
BMWPetrol

Z4 sDrive30i G29

258 hp · 400 Nm · 1,415 kg · 2018

Result · 0–100 km/h

APorsche Boxster S

5.08 s

Gap0.27 sin favour of Boxster S
BBMW Z4 sDrive30i G29

5.35 s

Summary · Caralogy simulation
MeasureBoxster SZ4 sDrive30i G29Gap
0–100 km/h5.08 s5.35 s0.27 s · Boxster S
400 m standing start13.23 s13.60 s0.37 s · Boxster S
1,000 m standing start23.87 s24.60 s0.73 s · Boxster S
Top speed (electronically limited)262 km/h250 km/h12 km/h · Boxster S
Power-to-weight ratio4.32 kg/hp5.48 kg/hpbetter ratio · Boxster S

Watch the race

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

PorschePetrolBoxster S
Speed
0km/h
Timer
0,00s
Distance
0m
BMWPetrolZ4 sDrive30i 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. Best value in bold.
StageBoxster SZ4 sDrive30i G29
0–30 km/h1.43 s · tight gap1.44 s
0–50 km/h2.38 s · tight gap2.40 s
0–80 km/h3.91 s · tight gap3.96 s
0–100 km/h5.08 s5.35 s
0–120 km/h6.61 s7.11 s
0–160 km/h10.72 s11.95 s
0–200 km/h17.41 s19.65 s
400 m standing start13.23 s13.60 s
1,000 m standing start23.87 s24.60 s
Top speed limited262 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.

Porsche

Boxster S

4,32kg/hpratio better by 1,17 kg/hp
CharacteristicValueDetail
Power314 hpEngine block and cylinder heads formed in aluminum
Torque361 Nm
Weight1 355 kgmanufacturer kerb weight
DrivetrainPropulsion
Gearbox6 speed standard
BMW

Z4 sDrive30i G29

5,48kg/hpcompensated by −60 kg
CharacteristicValueDetail
Power258 hp4 cyl
Torque400 Nm
Weight1 415 kgmanufacturer kerb weight
Drivetrain-
GearboxEight-speed Steptronic transmission

The start: 0 to 100 km/h

Off the line, the Boxster S hits 100 km/h in 5.08 s versus 5.35 s for the Z4 sDrive30i. The 0.27 s gap is negligible: both vehicles are neck and neck.

From 100 km/h to 400 metres

At 200 metres, the Boxster S is doing 143 km/h against 137 km/h for the Z4 sDrive30i. The gap is 0.18 s. The gap remains stable from the start.

At 400 metres standing start, the Boxster S crosses the line in 13.23 s versus 13.60 s. The 0.37 s gap represents roughly 17 m of track - two to three car lengths.

Beyond 400 metres: top speed comes into play

Past 400 metres, the Boxster S continues to build its lead. At 600 metres, it runs at 198 km/h versus 191 km/h. At 1,000 metres, the Boxster S finishes in 23.87 s versus 24.59 s, with a 0.73 s lead. Both vehicles have similar top speeds (262 vs 250 (i.e. 155 mph - industry threshold) km/h), preventing any comeback.

What the numbers don’t tell you

Both rivals are electronically governed, but not at the same level: the Boxster S is capped at 274 km/h, the Z4 sDrive30i 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 (4.32 kg/hp vs 5.48 kg/hp) and transmission (Unknown vs Automatic).

In European road use (130 km/h max), both vehicles reach the legal speed limit in under 8.13 seconds. The 0.27 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.

Other duels you might be interested in

PorscheVSJaguar

Boxster S vs F-TYPE P300

PorscheVSBMW

Boxster vs Z4 sDrive30i

BMWVSPorsche

Z4 M40i vs Boxster S

PorscheVSBMW

Boxster vs Z4 sDrive30i

Frequently asked questions

Over 0–100 km/h, Boxster S wins (5,08 s vs 5,35 s).

Boxster S goes from 0 to 100 km/h in 5,08 seconds (calibrated simulation).

Boxster S: 314 hp, ratio 4,32 kg/hp. Z4 sDrive30i G29: 258 hp, ratio 5,48 kg/hp.

Boxster S: 262 km/h. Z4 sDrive30i G29: 250 km/h.