Car comparison

Porsche Boxster (987) 2.7vsBMW Z4 (E85) 2.5i

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

New comparison

Porsche Boxster (987)

2.7

240 hp2687 ccGasolineRWDManualNaturally aspiratedRoadster2004-2006
VS

BMW Z4 (E85)

2.5i

192 hp2494 ccGasolineRWDManualNaturally aspiratedRoadster2002-2006

Comparison overview

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

Best choices

Porsche Boxster (987) 2.7

  • Quickest 0-100 km/h
    6.2 s
  • Fastest top speed
    256 km/h
    159 mph
  • Most powerful
    240 hp
    179 kW
  • Highest torque
    270 Nm
    199 lb-ft
  • Lightest
    1,295 kg
    2,855 lb
  • Best power-to-weight
    185 hp/t
    138 kW/t
    5.4 kg/hp
  • Best overall score
    48/100
  • Best performance score
    59/100

BMW Z4 (E85) 2.5i

  • Lowest combined fuel consumption
    7.4 L/100 km
    31.8 mpg US
    38.2 mpg UK
  • Lowest city consumption
    10.4 L/100 km
    22.6 mpg US
    27.2 mpg UK
  • Lowest highway consumption
    5.7 L/100 km
    41.3 mpg US
    49.6 mpg UK
  • Best estimated range
    743 km
    462 mi
  • Largest trunk
    240 L
  • Best economy score
    87/100
  • Best practicality score
    30/100

Specification comparison

Specification comparison
ModelPorscheBoxster (987)2.7BMWZ4 (E85)2.5i
Power
240hp179kW
192hp143kW
Torque
270Nm199lb-ft
245Nm181lb-ft
Curb weight
1,295kg2,855lb
1,335kg2,943lb
Gross weight
1,610kg3,549lb
1,560kg3,439lb
Top speed
256 km/h
159 mph
235 km/h
146 mph
To 99% top speed
91.5s99% target: 253 km/h / 157 mph
Calculated
80.5s99% target: 233 km/h / 145 mph
Calculated
0-100 km/h
6.2s
7.0s
0-200 km/h
24.0s
29.1s
Calculated
0-60 mph
5.9s
Calculated
6.6s
Calculated
Fuel consumption
9.6L/100 km24.5mpg US29.4mpg UK
7.4L/100 km31.8mpg US38.2mpg UK
Fuel consumption city
13.9L/100 km16.9mpg US20.3mpg UK
10.4L/100 km22.6mpg US27.2mpg UK
Fuel consumption highway
6.9L/100 km34.1mpg US40.9mpg UK
5.7L/100 km41.3mpg US49.6mpg UK
Quarter mile
14.3s
Calculated
15.0s
Calculated
Power-to-weight
185hp/t138kW/t84hp/1000 lb
Calculated
144hp/t107kW/t65hp/1000 lb
Calculated
Torque-to-weight
208Nm/t140lb-ft/ton
Calculated
184Nm/t123lb-ft/ton
Calculated
Estimated range
667km414mi
Calculated
743km462mi
Calculated
Displacement
2,687cc164cu in
2,494cc152cu in
Length
4,329mm170in
4,091mm161in
Width
1,801mm71in
1,781mm70in
Height
1,295mm51in
1,299mm51in
Wheelbase
2,415mm95in
2,495mm98in
Front track-
1,473mm58in
Rear track-
1,523mm60in
Ground clearance
121mm5in
-
Trunk volume
130L
240L
Max trunk volume-
260L
Doors
2
2
Seats
2
2
Fuel tank
64L
55L
CO2 emissions
229g/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 (987) 2.7BMW Z4 (E85) 2.5iPowerTorque
  • Porsche Boxster (987) 2.7: Power / Torque
  • BMW Z4 (E85) 2.5i: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
PorscheBoxster (987)2.76,400 rpm4,700-6,000 rpm7,200 rpm
BMWZ4 (E85)2.5i6,000 rpm3,500 rpm6,250 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricPorscheBoxster (987)2.7BMWZ4 (E85)2.5i
Acceleration checkpoints
0-60 mph
0-97 km/h
5.9 s
6.6 s
0-100 km/h
0-62 mph
6.2 s
7.0 s
0-200 km/h
0-124 mph
24.0 s
29.1 s
Top speed
256 km/h
159 mph
235 km/h
146 mph
Drag race simulation
60 ft
18 m
2.3 s
2.5 s
330 ft
101 m
6.2 s
6.5 s
1/8 mile
201 m
9.3 s
9.8 s
1000 ft
305 m
12.0 s
12.6 s
1/4 mile
402 m
14.3 s
15.0 s
Trap speed
1/4 mile
402 m
161 km/h
100 mph
155 km/h
96 mph

Power comparison

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

Chart data table
VehicleValue
PorscheBoxster (987)2.7
240 hp
179 kW
BMWZ4 (E85)2.5i
192 hp
143 kW

Porsche Boxster (987) 2.7 has 48 hp more than BMW Z4 (E85) 2.5i.

The biggest power difference is between BMW Z4 (E85) 2.5i and Porsche Boxster (987) 2.7: 48 hp (36 kW).

Torque comparison

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

Chart data table
VehicleValue
PorscheBoxster (987)2.7
270 Nm
199 lb-ft
BMWZ4 (E85)2.5i
245 Nm
181 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
PorscheBoxster (987)2.7
1,295 kg
2,855 lb
BMWZ4 (E85)2.5i
1,335 kg
2,943 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 (987)2.7
256 km/h
159 mph
BMWZ4 (E85)2.5i
235 km/h
146 mph

0-100 km/h comparison

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

Chart data table
VehicleValue
PorscheBoxster (987)2.76.2 s
BMWZ4 (E85)2.5i7.0 s

The biggest 0-100 km/h difference is between Porsche Boxster (987) 2.7 and BMW Z4 (E85) 2.5i: 0.8 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 (987)2.7
9.6 L/100 km
24.5 mpg US
29.4 mpg UK
BMWZ4 (E85)2.5i
7.4 L/100 km
31.8 mpg US
38.2 mpg UK

The biggest fuel consumption difference is between BMW Z4 (E85) 2.5i and Porsche Boxster (987) 2.7: 2.2 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 (987)2.7
185 hp/t
138 kW/t
5.4 kg/hp
BMWZ4 (E85)2.5i
144 hp/t
107 kW/t
7.0 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
PorscheBoxster (987)2.7
667 km
414 mi
BMWZ4 (E85)2.5i
743 km
462 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
PorscheBoxster (987)2.7
240 hp
179 kW
6.2 s
256 km/h
159 mph
BMWZ4 (E85)2.5i
192 hp
143 kW
7.0 s
235 km/h
146 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 (987)2.7
Power
240 hp
179 kW
0-100 km/h6.2 s
Top speed
256 km/h
159 mph
Doors/seats
2 doors
2 seats
Trunk
130 L
4.6 cu ft
Length
4,329 mm
170.4 in
Height
1,295 mm
51.0 in
BMWZ4 (E85)2.5i
Power
192 hp
143 kW
0-100 km/h7.0 s
Top speed
235 km/h
146 mph
Doors/seats
2 doors
2 seats
Trunk
240 L
8.5 cu ft
Length
4,091 mm
161.1 in
Height
1,299 mm
51.1 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 (987)2.7
Power
240 hp
179 kW
0-100 km/h6.2 s
Top speed
256 km/h
159 mph
9.6 L/100 km
24.5 mpg US
29.4 mpg UK
BMWZ4 (E85)2.5i
Power
192 hp
143 kW
0-100 km/h7.0 s
Top speed
235 km/h
146 mph
7.4 L/100 km
31.8 mpg US
38.2 mpg UK

Porsche Boxster (987) 2.7 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 (987)2.7
9.6 L/100 km
24.5 mpg US
29.4 mpg UK
6.2 s
BMWZ4 (E85)2.5i
7.4 L/100 km
31.8 mpg US
38.2 mpg UK
7.0 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 (987)2.7
185 hp/t
138 kW/t
5.4 kg/hp
9.6 L/100 km
24.5 mpg US
29.4 mpg UK
BMWZ4 (E85)2.5i
144 hp/t
107 kW/t
7.0 kg/hp
7.4 L/100 km
31.8 mpg US
38.2 mpg UK

Detailed score breakdown

Detailed score breakdown
VehiclePorscheBoxster (987)2.7BMWZ4 (E85)2.5i
Power
240 hp
179 kW
192 hp
143 kW
Torque
270 Nm
199 lb-ft
245 Nm
181 lb-ft
Acceleration
6.2 s
7.0 s
Top speed
256 km/h
159 mph
235 km/h
146 mph
Lightness
1,295 kg
2,855 lb
1,335 kg
2,943 lb
Fuel consumption
9.6 L/100 km
24.5 mpg US
29.4 mpg UK
7.4 L/100 km
31.8 mpg US
38.2 mpg UK
Practicality
Doors/seats
2 doors
2 seats
Trunk
130 L
4.6 cu ft
Length
4,329 mm
170.4 in
Height
1,295 mm
51.0 in
Doors/seats
2 doors
2 seats
Trunk
240 L
8.5 cu ft
Length
4,091 mm
161.1 in
Height
1,299 mm
51.1 in
Range score
667 km
414 mi
743 km
462 mi
CO2 score
229 g/km
-
Trunk score
130 L
4.6 cu ft
240 L
8.5 cu ft
Power-to-weight score
185 hp/t
138 kW/t
5.4 kg/hp
144 hp/t
107 kW/t
7.0 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 (987) 2.7BMW Z4 (E85) 2.5i
Consumption9.6 L/100 km24.5 mpg US29.4 mpg UK7.4 L/100 km31.8 mpg US38.2 mpg UK
Cost / 100 km16.80 LC100 km12.95 LC100 km
Cost / 100 mi27.04 LC100 mi20.84 LC100 mi
Annual fuel used1,440 L380 US gal317 UK gal1,110 L293 US gal244 UK gal
Annual fuel cost2,520 LC/year1,943 LC/year

Head-to-head comparisons

Porsche Boxster (987) 2.7

  • Has 48 hp more
  • Has 25 Nm more
  • Is 40 kg lighter
  • Is 0.8 s quicker from 0-100 km/h
  • Has 21 km/h (13 mph) higher top speed
  • Has 42 hp/t better power-to-weight

Pros

  • Quickest 0-100 km/h in this comparison
  • Highest top speed
  • Most powerful
  • Highest torque
  • Lightest
  • Best power-to-weight ratio

Cons

  • Highest combined fuel consumption
  • Smallest trunk

BMW Z4 (E85) 2.5i

  • Uses 2.2 L/100 km less fuel
  • Has 77 km (48 mi) more estimated range
  • Has 110 L more trunk volume

Pros

  • Lowest combined fuel consumption
  • Best estimated range
  • Largest trunk

Cons

  • Slowest 0-100 km/h
  • Lowest power
  • Heaviest
  • Lowest top speed

Choose cars to compare

Brand
Model
Generation
Engine or modification
Porsche Boxster (987) 2.7
BMW Z4 (E85) 2.5i
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