Car comparison

Porsche Boxster (981) GTS 3.4vsBMW Z4 (G29) M40i

Compare specs, acceleration, fuel consumption, dimensions, practicality, and estimated running costs side by side.

New comparison

Porsche Boxster (981)

GTS 3.4

330 hp3436 ccGasolineRWDDual-clutchNaturally aspiratedRoadster2015-2016
VS

BMW Z4 (G29)

M40i

340 hp2998 ccGasolineAWDAutomaticTurbochargedRoadster2018-2022

Comparison overview

Use the estimates as comparison hints and verify exact figures before making decisions.

Best choices

BMW Z4 (G29) M40i

  • Quickest 0-100 km/h
    4.5 s
  • Most powerful
    340 hp
    254 kW
  • Highest torque
    500 Nm
    369 lb-ft
  • Lowest combined fuel consumption
    7.4 L/100 km
    31.8 mpg US
    38.2 mpg UK
  • Lowest city consumption
    9.2 L/100 km
    25.6 mpg US
    30.7 mpg UK
  • Lowest CO2 emissions
    168 g/km
  • Largest trunk
    281 L
  • Best overall score
    60/100
  • Best performance score
    73/100
  • Best economy score
    87/100
  • Best practicality score
    32/100

Porsche Boxster (981) GTS 3.4

  • Fastest top speed
    279 km/h
    173 mph
  • Lightest
    1,375 kg
    3,031 lb
  • Best power-to-weight
    240 hp/t
    179 kW/t
    4.2 kg/hp
  • Lowest highway consumption
    6.3 L/100 km
    37.3 mpg US
    44.8 mpg UK
  • Best estimated range
    780 km
    485 mi

Specification comparison

Specification comparison
ModelPorscheBoxster (981)GTS 3.4BMWZ4 (G29)M40i
Power
330hp246kW
340hp254kW
Torque
370Nm273lb-ft
500Nm369lb-ft
Curb weight
1,375kg3,031lb
1,535kg3,384lb
Gross weight
1,685kg3,715lb
1,860kg4,101lb
Top speed
279 km/h
173 mph
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Calculated
To 99% top speed
64.2s99% target: 276 km/h / 172 mph
Calculated
57.6s99% target: 262 km/h / 163 mph
Calculated
0-100 km/h
4.9s
4.5s
0-200 km/h
15.5s
Calculated
15.2s
Calculated
0-60 mph
4.7s
Calculated
4.3s
Calculated
Fuel consumption
8.2L/100 km28.7mpg US34.4mpg UK
7.4L/100 km31.8mpg US38.2mpg UK
Fuel consumption city
11.4L/100 km20.6mpg US24.8mpg UK
9.2L/100 km25.6mpg US30.7mpg UK
Fuel consumption highway
6.3L/100 km37.3mpg US44.8mpg UK
6.3L/100 km37.3mpg US44.8mpg UK
Quarter mile
12.9s
Calculated
12.6s
Calculated
Power-to-weight
240hp/t179kW/t109hp/1000 lb
Calculated
221hp/t165kW/t100hp/1000 lb
Calculated
Torque-to-weight
269Nm/t180lb-ft/ton
Calculated
326Nm/t218lb-ft/ton
Calculated
Estimated range
780km485mi
Calculated
703km437mi
Calculated
Displacement
3,436cc210cu in
2,998cc183cu in
Length
4,404mm173in
4,324mm170in
Width
1,801mm71in
1,864mm73in
Height
1,273mm50in
1,304mm51in
Wheelbase
2,475mm97in
2,470mm97in
Front track-
1,594mm63in
Rear track-
1,589mm63in
Ground clearance-
114mm4in
Trunk volume
280L
281L
Doors
2
2
Seats
2
2
Fuel tank
64L
52L
CO2 emissions
190g/km
168g/km

Performance charts

Use the estimates as comparison hints and verify exact figures before making decisions.

Dyno simulation

Estimated stock-style power and torque curves by engine speed.

Porsche Boxster (981) GTS 3.4BMW Z4 (G29) M40iPowerTorque
  • Porsche Boxster (981) GTS 3.4: Power / Torque
  • BMW Z4 (G29) M40i: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
PorscheBoxster (981)GTS 3.46,700 rpm4,500-5,800 rpm6,950 rpm
BMWZ4 (G29)M40i5,000-6,500 rpm1,600-4,500 rpm6,750 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricPorscheBoxster (981)GTS 3.4BMWZ4 (G29)M40i
Acceleration checkpoints
0-60 mph
0-97 km/h
4.7 s
4.3 s
0-100 km/h
0-62 mph
4.9 s
4.5 s
0-200 km/h
0-124 mph
15.5 s
15.2 s
Top speed
279 km/h
173 mph
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Likely limited
Drag race simulation
60 ft
18 m
2.2 s
2.1 s
330 ft
101 m
5.7 s
5.5 s
1/8 mile
201 m
8.5 s
8.2 s
1000 ft
305 m
10.9 s
10.6 s
1/4 mile
402 m
12.9 s
12.6 s
Trap speed
1/4 mile
402 m
183 km/h
114 mph
184 km/h
114 mph

Power comparison

Bar comparison chart for Power. Higher is better · hp / kW

Chart data table
VehicleValue
PorscheBoxster (981)GTS 3.4
330 hp
246 kW
BMWZ4 (G29)M40i
340 hp
254 kW

BMW Z4 (G29) M40i has 10 hp more than Porsche Boxster (981) GTS 3.4.

The biggest power difference is between Porsche Boxster (981) GTS 3.4 and BMW Z4 (G29) M40i: 10 hp (7 kW).

Torque comparison

Bar comparison chart for Torque. Higher is better · Nm / lb-ft

Chart data table
VehicleValue
PorscheBoxster (981)GTS 3.4
370 Nm
273 lb-ft
BMWZ4 (G29)M40i
500 Nm
369 lb-ft

Curb weight comparison

Bar comparison chart for Curb weight. Lower is better · kg / lb

Chart data table
VehicleValue
PorscheBoxster (981)GTS 3.4
1,375 kg
3,031 lb
BMWZ4 (G29)M40i
1,535 kg
3,384 lb

Top speed without limiter comparison

Bar comparison chart for Top speed without limiter. Higher is better · km/h / mph

Chart data table
VehicleValue
PorscheBoxster (981)GTS 3.4
279 km/h
173 mph
BMWZ4 (G29)M40i
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph

0-100 km/h comparison

Bar comparison chart for 0-100 km/h. Lower is better · seconds

Chart data table
VehicleValue
PorscheBoxster (981)GTS 3.44.9 s
BMWZ4 (G29)M40i4.5 s

The biggest 0-100 km/h difference is between BMW Z4 (G29) M40i and Porsche Boxster (981) GTS 3.4: 0.4 s.

Fuel consumption comparison

Bar comparison chart for Fuel consumption. Lower is better · L/100 km / mpg US / mpg UK

Chart data table
VehicleValue
PorscheBoxster (981)GTS 3.4
8.2 L/100 km
28.7 mpg US
34.4 mpg UK
BMWZ4 (G29)M40i
7.4 L/100 km
31.8 mpg US
38.2 mpg UK

The biggest fuel consumption difference is between BMW Z4 (G29) M40i and Porsche Boxster (981) GTS 3.4: 0.8 L/100 km.

Power-to-weight comparison

Bar comparison chart for Power-to-weight. Higher is better · hp/t / kW/t

Chart data table
VehicleValue
PorscheBoxster (981)GTS 3.4
240 hp/t
179 kW/t
4.2 kg/hp
BMWZ4 (G29)M40i
221 hp/t
165 kW/t
4.5 kg/hp

Estimated range comparison

Bar comparison chart for Estimated range. Higher is better · km / mi

Chart data table
VehicleValue
PorscheBoxster (981)GTS 3.4
780 km
485 mi
BMWZ4 (G29)M40i
703 km
437 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
PorscheBoxster (981)GTS 3.4
330 hp
246 kW
4.9 s
279 km/h
173 mph
BMWZ4 (G29)M40i
340 hp
254 kW
4.5 s
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph

Most attractive quadrant

Scatter chart with performance score on the X axis and practicality score on the Y axis.

Chart data table
VehiclePerformance scorePracticality score
PorscheBoxster (981)GTS 3.4
Power
330 hp
246 kW
0-100 km/h4.9 s
Top speed
279 km/h
173 mph
Doors/seats
2 doors
2 seats
Trunk
280 L
9.9 cu ft
Length
4,404 mm
173.4 in
Height
1,273 mm
50.1 in
BMWZ4 (G29)M40i
Power
340 hp
254 kW
0-100 km/h4.5 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Doors/seats
2 doors
2 seats
Trunk
281 L
9.9 cu ft
Length
4,324 mm
170.2 in
Height
1,304 mm
51.3 in

Performance vs fuel economy

Cars closer to the top-right corner combine stronger performance with better fuel economy scores.

Performance vs fuel economy data table
VehiclePerformance scoreFuel economy score
PorscheBoxster (981)GTS 3.4
Power
330 hp
246 kW
0-100 km/h4.9 s
Top speed
279 km/h
173 mph
8.2 L/100 km
28.7 mpg US
34.4 mpg UK
BMWZ4 (G29)M40i
Power
340 hp
254 kW
0-100 km/h4.5 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
7.4 L/100 km
31.8 mpg US
38.2 mpg UK

BMW Z4 (G29) M40i is closest to the top-right balance target for performance and fuel economy.

Acceleration vs fuel consumption

Cars closer to the lower-left corner offer a better mix of quick acceleration and low fuel consumption.

Acceleration vs fuel consumption data table
VehicleFuel consumption, L/100 km0-100 km/h, s
PorscheBoxster (981)GTS 3.4
8.2 L/100 km
28.7 mpg US
34.4 mpg UK
4.9 s
BMWZ4 (G29)M40i
7.4 L/100 km
31.8 mpg US
38.2 mpg UK
4.5 s

Power-to-weight vs fuel consumption

The shaded area favors higher power-to-weight with lower combined fuel consumption.

Power-to-weight vs fuel consumption data table
VehiclePower-to-weight, hp/tFuel consumption, L/100 km
PorscheBoxster (981)GTS 3.4
240 hp/t
179 kW/t
4.2 kg/hp
8.2 L/100 km
28.7 mpg US
34.4 mpg UK
BMWZ4 (G29)M40i
221 hp/t
165 kW/t
4.5 kg/hp
7.4 L/100 km
31.8 mpg US
38.2 mpg UK

Detailed score breakdown

Detailed score breakdown
VehiclePorscheBoxster (981)GTS 3.4BMWZ4 (G29)M40i
Power
330 hp
246 kW
340 hp
254 kW
Torque
370 Nm
273 lb-ft
500 Nm
369 lb-ft
Acceleration
4.9 s
4.5 s
Top speed
279 km/h
173 mph
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Lightness
1,375 kg
3,031 lb
1,535 kg
3,384 lb
Fuel consumption
8.2 L/100 km
28.7 mpg US
34.4 mpg UK
7.4 L/100 km
31.8 mpg US
38.2 mpg UK
Practicality
Doors/seats
2 doors
2 seats
Trunk
280 L
9.9 cu ft
Length
4,404 mm
173.4 in
Height
1,273 mm
50.1 in
Doors/seats
2 doors
2 seats
Trunk
281 L
9.9 cu ft
Length
4,324 mm
170.2 in
Height
1,304 mm
51.3 in
Range score
780 km
485 mi
703 km
437 mi
CO2 score
190 g/km
168 g/km
Trunk score
280 L
9.9 cu ft
281 L
9.9 cu ft
Power-to-weight score
240 hp/t
179 kW/t
4.2 kg/hp
221 hp/t
165 kW/t
4.5 kg/hp
Overall
Fixed score
Fixed score

Fuel cost and annual usage

Estimate running costs from combined consumption, your annual distance, and the fuel price in your local currency.

Enter the fuel price in your local currency, for example €/L, $/gal, £/L or any other local currency.

LC = Local Currency

Fuel cost and annual usage
VehiclePorsche Boxster (981) GTS 3.4BMW Z4 (G29) M40i
Consumption8.2 L/100 km28.7 mpg US34.4 mpg UK7.4 L/100 km31.8 mpg US38.2 mpg UK
Cost / 100 km14.35 LC100 km12.95 LC100 km
Cost / 100 mi23.09 LC100 mi20.84 LC100 mi
Annual fuel used1,230 L325 US gal271 UK gal1,110 L293 US gal244 UK gal
Annual fuel cost2,153 LC/year1,943 LC/year

Head-to-head comparisons

Porsche Boxster (981) GTS 3.4

  • Is 160 kg lighter
  • Has 14 km/h (9 mph) higher top speed
  • Has 19 hp/t better power-to-weight
  • Has 78 km (48 mi) more estimated range

Pros

  • Highest top speed
  • Lightest
  • Best power-to-weight ratio
  • Best estimated range

Cons

  • Slowest 0-100 km/h
  • Lowest power
  • Highest combined fuel consumption
  • Smallest trunk
  • Highest CO2 emissions

BMW Z4 (G29) M40i

  • Has 10 hp more
  • Has 130 Nm more
  • Is 0.4 s quicker from 0-100 km/h
  • Uses 0.8 L/100 km less fuel
  • Has 1 L more trunk volume
  • Emits 22 g/km less CO2

Pros

  • Quickest 0-100 km/h in this comparison
  • Most powerful
  • Highest torque
  • Lowest combined fuel consumption
  • Largest trunk

Cons

  • Heaviest
  • Lowest top speed

Choose cars to compare

Brand
Model
Generation
Engine or modification
Porsche Boxster (981) GTS 3.4
BMW Z4 (G29) M40i
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