Car comparison

Porsche Boxster (987) · Facelift 2009 2.9vsBMW Z4 (E89) 28i

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

New comparison

Porsche Boxster (987) · Facelift 2009

2.9

255 hp2893 ccGasolineRWDAutomaticNaturally aspiratedRoadster2009-2012

BMW Z4 (E89)

28i

245 hp1997 ccGasolineRWDAutomaticTurbochargedRoadster2011-2013

Comparison overview

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

BMW Z4 (E89) 28i

Quickest 0-100 km/h
5.5 s
Highest torque
350 Nm
258 lb-ft
Lowest combined fuel consumption
6.8 L/100 km
34.6 mpg US
41.5 mpg UK
Lowest city consumption
9.4 L/100 km
25.0 mpg US
30.1 mpg UK
Lowest highway consumption
5.3 L/100 km
44.4 mpg US
53.3 mpg UK
Lowest CO2 emissions
159 g/km
Best estimated range
809 km
503 mi
Best overall score
52/100
Best economy score
89/100
Best practicality score
32/100

Porsche Boxster (987) Facelift 2009 2.9

Fastest top speed
261 km/h
162 mph
Most powerful
255 hp
190 kW
Lightest
1,365 kg
3,009 lb
Best power-to-weight
187 hp/t
139 kW/t
5.4 kg/hp
Best performance score
62/100

Specification comparison

Specification comparison
Model	PorscheBoxster (987)Facelift 20092.9	BMWZ4 (E89)28i
Power	255hp190kW	245hp183kW
Torque	290Nm214lb-ft	350Nm258lb-ft
Curb weight	1,365kg3,009lb	1,495kg3,296lb
Gross weight	1,670kg3,682lb	1,750kg3,858lb
Top speed	261 km/h 162 mph	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph Calculated
To 99% top speed	89.6s99% target: 258 km/h / 161 mph Calculated	73.0s99% target: 257 km/h / 160 mph Calculated
0-100 km/h	5.8s	5.5s
0-200 km/h	22.1s	19.6s Calculated
0-60 mph	5.5s Calculated	5.2s Calculated
Fuel consumption	9.1L/100 km25.8mpg US31.0mpg UK	6.8L/100 km34.6mpg US41.5mpg UK
Fuel consumption city	13.6L/100 km17.3mpg US20.8mpg UK	9.4L/100 km25mpg US30.1mpg UK
Fuel consumption highway	6.5L/100 km36.2mpg US43.5mpg UK	5.3L/100 km44.4mpg US53.3mpg UK
Quarter mile	13.9s Calculated	13.6s Calculated
Power-to-weight	187hp/t139kW/t85hp/1000 lb Calculated	164hp/t122kW/t74hp/1000 lb Calculated
Torque-to-weight	212Nm/t142lb-ft/ton Calculated	234Nm/t157lb-ft/ton Calculated
Estimated range	714km444mi Calculated	809km503mi Calculated
Displacement	2,893cc177cu in	1,997cc122cu in
Length	4,342mm171in	4,239mm167in
Width	1,801mm71in	1,790mm70in
Height	1,292mm51in	1,291mm51in
Wheelbase	2,415mm95in	2,496mm98in
Front track	1,490mm59in	1,511mm59in
Rear track	1,534mm60in	1,559mm61in
Ground clearance	127mm5in	-
Trunk volume	130L	-
Doors	2	2
Seats	2	2
Fuel tank	65L	55L
CO2 emissions	214g/km	159g/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) Facelift 2009 2.9BMW Z4 (E89) 28iPowerTorque

Dyno simulation data table
Vehicle	Peak power RPM	Peak torque RPM	Max engine speed
PorscheBoxster (987)Facelift 20092.9	7,200 rpm	4,400-6,000 rpm	7,500 rpm
BMWZ4 (E89)28i	5,000-6,500 rpm	1,250-4,800 rpm	6,750 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
Metric	PorscheBoxster (987)Facelift 20092.9	BMWZ4 (E89)28i
	Acceleration checkpoints
0-60 mph 0-97 km/h	5.5 s	5.2 s
0-100 km/h 0-62 mph	5.8 s	5.5 s
0-200 km/h 0-124 mph	22.1 s	19.6 s
Top speed	261 km/h 162 mph	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph Likely limited
	Drag race simulation
60 ft 18 m	2.2 s	2.3 s
330 ft 101 m	6.0 s	5.9 s
1/8 mile 201 m	9.1 s	8.9 s
1000 ft 305 m	11.7 s	11.5 s
1/4 mile 402 m	13.9 s	13.6 s
Trap speed 1/4 mile 402 m	165 km/h 102 mph	171 km/h 106 mph

Power comparison

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

Chart data table
Vehicle	Value
PorscheBoxster (987)Facelift 20092.9	255 hp 190 kW
BMWZ4 (E89)28i	245 hp 183 kW

Porsche Boxster (987) Facelift 2009 2.9 has 10 hp more than BMW Z4 (E89) 28i.

The biggest power difference is between BMW Z4 (E89) 28i and Porsche Boxster (987) Facelift 2009 2.9: 10 hp (7 kW).

Torque comparison

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

Chart data table
Vehicle	Value
PorscheBoxster (987)Facelift 20092.9	290 Nm 214 lb-ft
BMWZ4 (E89)28i	350 Nm 258 lb-ft

Curb weight comparison

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

Chart data table
Vehicle	Value
PorscheBoxster (987)Facelift 20092.9	1,365 kg 3,009 lb
BMWZ4 (E89)28i	1,495 kg 3,296 lb

Top speed without limiter comparison

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

Chart data table
Vehicle	Value
PorscheBoxster (987)Facelift 20092.9	261 km/h 162 mph
BMWZ4 (E89)28i	Unrestricted 260 km/h162 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
Vehicle	Value
PorscheBoxster (987)Facelift 20092.9	5.8 s
BMWZ4 (E89)28i	5.5 s

Although Porsche Boxster (987) Facelift 2009 2.9 has more power, BMW Z4 (E89) 28i is quicker from 0-100 km/h.

The biggest 0-100 km/h difference is between BMW Z4 (E89) 28i and Porsche Boxster (987) Facelift 2009 2.9: 0.3 s.

Fuel consumption comparison

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

Chart data table
Vehicle	Value
PorscheBoxster (987)Facelift 20092.9	9.1 L/100 km 25.8 mpg US 31.0 mpg UK
BMWZ4 (E89)28i	6.8 L/100 km 34.6 mpg US 41.5 mpg UK

The biggest fuel consumption difference is between BMW Z4 (E89) 28i and Porsche Boxster (987) Facelift 2009 2.9: 2.3 L/100 km.

Power-to-weight comparison

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

Chart data table
Vehicle	Value
PorscheBoxster (987)Facelift 20092.9	187 hp/t 139 kW/t 5.4 kg/hp
BMWZ4 (E89)28i	164 hp/t 122 kW/t 6.1 kg/hp

Estimated range comparison

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

Chart data table
Vehicle	Value
PorscheBoxster (987)Facelift 20092.9	714 km 444 mi
BMWZ4 (E89)28i	809 km 503 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
Vehicle	Power	Acceleration	Top speed
PorscheBoxster (987)Facelift 20092.9	255 hp 190 kW	5.8 s	261 km/h 162 mph
BMWZ4 (E89)28i	245 hp 183 kW	5.5 s	Unrestricted 260 km/h162 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.

Vehicle

Performance score

Practicality score

PorscheBoxster (987)Facelift 20092.9

Power	255 hp 190 kW
0-100 km/h	5.8 s
Top speed 261 km/h 162 mph

Doors/seats	2 doors 2 seats
Trunk	130 L 4.6 cu ft
Length	4,342 mm 170.9 in
Height	1,292 mm 50.9 in

BMWZ4 (E89)28i

Power	245 hp 183 kW
0-100 km/h	5.5 s
Top speed Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph

Doors/seats	2 doors 2 seats
Trunk	-
Length	4,239 mm 166.9 in
Height	1,291 mm 50.8 in

Performance vs fuel economy

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

Vehicle

Performance score

Fuel economy score

PorscheBoxster (987)Facelift 20092.9

Power	255 hp 190 kW
0-100 km/h	5.8 s
Top speed 261 km/h 162 mph

9.1 L/100 km

25.8 mpg US

31.0 mpg UK

BMWZ4 (E89)28i

Power	245 hp 183 kW
0-100 km/h	5.5 s
Top speed Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph

6.8 L/100 km

34.6 mpg US

41.5 mpg UK

BMW Z4 (E89) 28i 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
Vehicle	Fuel consumption, L/100 km	0-100 km/h, s
PorscheBoxster (987)Facelift 20092.9	9.1 L/100 km 25.8 mpg US 31.0 mpg UK	5.8 s
BMWZ4 (E89)28i	6.8 L/100 km 34.6 mpg US 41.5 mpg UK	5.5 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
Vehicle	Power-to-weight, hp/t	Fuel consumption, L/100 km
PorscheBoxster (987)Facelift 20092.9	187 hp/t 139 kW/t 5.4 kg/hp	9.1 L/100 km 25.8 mpg US 31.0 mpg UK
BMWZ4 (E89)28i	164 hp/t 122 kW/t 6.1 kg/hp	6.8 L/100 km 34.6 mpg US 41.5 mpg UK

Detailed score breakdown

Vehicle

PorscheBoxster (987)Facelift 20092.9

BMWZ4 (E89)28i

Power

255 hp

190 kW

245 hp

183 kW

Torque

290 Nm

214 lb-ft

350 Nm

258 lb-ft

Acceleration

5.8 s

5.5 s

Top speed

261 km/h

162 mph

Unrestricted

260 km/h162 mph

Restricted

250 km/h155 mph

Lightness

1,365 kg

3,009 lb

1,495 kg

3,296 lb

Fuel consumption

9.1 L/100 km

25.8 mpg US

31.0 mpg UK

6.8 L/100 km

34.6 mpg US

41.5 mpg UK

Practicality

Doors/seats	2 doors 2 seats
Trunk	130 L 4.6 cu ft
Length	4,342 mm 170.9 in
Height	1,292 mm 50.9 in

Doors/seats	2 doors 2 seats
Trunk	-
Length	4,239 mm 166.9 in
Height	1,291 mm 50.8 in

Range score

714 km

444 mi

809 km

503 mi

CO2 score

214 g/km

159 g/km

Trunk score

130 L

4.6 cu ft

Power-to-weight score

187 hp/t

139 kW/t

5.4 kg/hp

164 hp/t

122 kW/t

6.1 kg/hp

Overall

Fixed score

Fuel cost and annual usage

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

Average annual distanceDistance unitFuel price in your local currencyPrice unit

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
Vehicle	Porsche Boxster (987) Facelift 2009 2.9	BMW Z4 (E89) 28i
Consumption	9.1 L/100 km25.8 mpg US31 mpg UK	6.8 L/100 km34.6 mpg US41.5 mpg UK
Cost / 100 km	15.92 LC100 km	11.90 LC100 km
Cost / 100 mi	25.63 LC100 mi	19.15 LC100 mi
Annual fuel used	1,365 L361 US gal300 UK gal	1,020 L269 US gal224 UK gal
Annual fuel cost	2,389 LC/year	1,785 LC/year