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A718PetrolvsB420dDiesel
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  • Specs718 · 420d

Porsche 718 Boxster GTS vs BMW 420d Convertible G22: 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 · 2018 vs 2021 · Methodology
PorschePetrolFaster

718 Boxster GTS

365 hp · 420 Nm · 1,375 kg · 2018

VS
BMWDiesel

420d Convertible G22

190 hp · 400 Nm · 1,775 kg · 2021

Result · 0–100 km/h

APorsche 718 Boxster GTS

4.46 s

Gap3.29 sin favour of 718 Boxster GTS
BBMW 420d Convertible G22

7.75 s

Summary · Caralogy simulation
Measure718 Boxster GTS420d Convertible G22Gap
0–100 km/h4.46 s7.75 s3.29 s · 718 Boxster GTS
400 m standing start12.32 s15.64 s3.32 s · 718 Boxster GTS
1,000 m standing start21.97 s28.69 s6.72 s · 718 Boxster GTS
Top speed (electronically limited)290 km/h236 km/h54 km/h · 718 Boxster GTS
Power-to-weight ratio3.77 kg/hp9.34 kg/hpbetter ratio · 718 Boxster GTS

Watch the race

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

PorschePetrol718 Boxster GTS
Speed
0km/h
Timer
0,00s
Distance
0m
BMWDiesel420d Convertible G22
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.
Stage718 Boxster GTS420d Convertible G22
0–30 km/h1.21 s1.52 s
0–50 km/h2.02 s2.64 s
0–80 km/h3.52 s5.29 s
0–100 km/h4.46 s7.75 s
0–120 km/h5.50 s10.87 s
0–160 km/h8.63 s20.11 s
0–200 km/h13.06 s37.54 s
400 m standing start12.32 s15.64 s
1,000 m standing start21.97 s28.69 s
Top speed290 km/h236 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

718 Boxster GTS

3,77kg/hpratio better by 5,57 kg/hp
CharacteristicValueDetail
Power365 hpB4
Torque420 Nm
Weight1 375 kgmanufacturer kerb weight
DrivetrainPropulsion
GearboxMANUAL
BMW

420d Convertible G22

9,34kg/hpcompensated by −400 kg
CharacteristicValueDetail
Power190 hp4 cyl
Torque400 Nm
Weight1 775 kgmanufacturer kerb weight
Drivetrain-
GearboxEight-speed Steptronic transmission

The start: 0 to 100 km/h

Off the line, the 718 Boxster GTS hits 100 km/h in 4.47 s versus 7.75 s for the 420d Convertible. At this point, the 718 Boxster GTS leads by 3.29 s and sits roughly 15 m ahead.

From 100 km/h to 400 metres

At 200 metres, the 718 Boxster GTS is doing 155 km/h against 116 km/h for the 420d Convertible. The gap is 1.89 s. The challenger starts to claw back ground.

At 400 metres standing start, the 718 Boxster GTS crosses the line in 12.32 s versus 15.64 s. The 3.32 s gap represents roughly 125 m of track - a gap visible to the naked eye.

Beyond 400 metres: top speed comes into play

Past 400 metres, the 718 Boxster GTS continues to build its lead. At 600 metres, it runs at 217 km/h versus 161 km/h. At 1,000 metres, the 718 Boxster GTS finishes in 21.96 s versus 28.69 s, with a 6.73 s lead.

What the numbers don’t tell you

Both rivals are electronically governed, but not at the same level: the 718 Boxster GTS is capped at 290 km/h, the 420d Convertible at 236 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 (3.77 kg/hp vs 9.34 kg/hp) and transmission (Manual vs Automatic).

In European road use (130 km/h max), both vehicles reach the legal speed limit in under 12.82 seconds. The 3.29 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.

Other duels you might be interested in

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718 Boxster GTS vs Z4 M40i

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A4 40 TDI vs 420d Convertible

PorscheVSBMW

718 Boxster GTS vs Z4 M40i

VolvoVSBMW

S60 B4 vs 420d Convertible

Frequently asked questions

Over 0–100 km/h, 718 Boxster GTS wins (4,46 s vs 7,75 s).

718 Boxster GTS goes from 0 to 100 km/h in 4,46 seconds (calibrated simulation).

718 Boxster GTS: 365 hp, ratio 3,77 kg/hp. 420d Convertible G22: 190 hp, ratio 9,34 kg/hp.

718 Boxster GTS: 290 km/h. 420d Convertible G22: 236 km/h.