BMW Z4 M Roadster vs BMW Z4 M Coupe

Picture of BMW Z4 M Coupe
Picture of BMW Z4 M Roadster
Category BMW Z4 M CoupeBMW Z4 M Roadster
Engine layout 3.2 l R63.2 l R6
Max power (ps / bhp) 343 / 338343 / 338
Max torque (Nm / lb-ft) 365 / 269365 / 269
Curb weight (kg / lb) 1486 / 32761444 / 3183
Power / tonne (ps / bhp) 231 / 227238 / 234


Speed & distance BMW Z4 M CoupeBMW Z4 M Roadster
0 - 100 kph 4.9 s4.9 s
0 - 200 kph 17.3 s17.0 s
Est. 100 - 200 kph 12.4 s12.0 s
0 - 60 mph 4.8 s4.6 s
0 - 100 mph 12.1 s11.3 s
0 - 150 mph 34.9 s32.9 s
Est. 1/8 mile 9.2 s @ 93.2 mph9.2 s @ 93.2 mph
1/4 mile 13.4 s @ 105.0 mph13.2 s @ 107.5 mph

General performance

Category BMW Z4 M CoupeBMW Z4 M Roadster
Top speed 257 kph (160 mph)251 kph (156 mph)
Est. max acceleration 0.63 g (6 m/s²)0.62 g (6 m/s²)
Fuel economy 11.8 l/100 km (20 mpg US / 24 UK)10.9 l/100 km (22 mpg US / 26 UK)


Category BMW Z4 M CoupeBMW Z4 M Roadster
Track Performance 296300
Straight line speed 10961188
Total 13921488


Z4 M Roadster is the fastest by a small margin.

This comparison has been viewed 6.2k times.

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kb24  12y ago

0-200km/h for coupe is 17,3 s tested in auto bild sportscars 2008

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bryan  13y ago

Clearly the weight difference can't be the culprit. Could there be other differences to blame (are the tires the same, aerodynamics/downforce, etc)? Any ideas?

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rage999  13y ago

quite a few mags like the EVO also tested the the roadster faster in a straight line pick-up at 4.8s vs 5s 0-60mph.

autocar has the z4M coupe at 5.1s but not test data for the roadster.

caranddriver had 4.6s for the roadster and 4.8s for the coupe

roadandtrack had 4.7s for the roadster but no data for the coupe.

based on the mag tests, it would appear that the roadster manages to do 0-60 consistently under 5 sec whereas most of the coupe is on the low 5s.

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rage999  13y ago

unlike most convertible, the Z4 is designed to be a roadster in the first place and therefore its not short of rigidity even though the coupe technically is supposed to have more rigidity. however, you will find that extra rigidity pretty intangible on track and it all comes down to the tyres, surfaces temp on the day and the driver that makes the difference.

however, for whatever reason, the coupe would appear to be genuinely slower in a straight line compared to the roadster which would appear to be due to lack of traction as this vid demonstrates.


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Viking  13y ago

One thing that could give an edge on a track would be if the suspension tuning was different. A minor change by BMW in spring rates (or something similar) could affect the balance of the car and thus make one better or worse in lap times.

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Viking  13y ago

I agree with both of you. 20 kg is pretty much negligible as far as cars in this power to weight catagory. It might make a tenth of a second difference over a quarter mile (or not). Clearly the acceleration tests were done by different drivers or conditions. As for the lap times, Oschersleben is listed as wet for the Coupe test, easily accounting for the six second difference. The other lap times are very close/same. All together, it looks to me like the extra rigidity of the Coupe hasn\'t given a significant advantage and the extra weight really doesn\'t slow it down either. Driver skill would determine the winner if a Z4 M roadster competed against the coupe. I doubt the computer program\'s verdict is correct.

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tom  13y ago

i agree with you rob...i have the roadster but have driven the coupe and it feels much stiffer thus you would think it would have quicker lap times...the cars have the same engine / bhp etc although i believe the coupe weighs 20 kg more but im sure this wouldnt make a difference like the stats above.

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Rob  13y ago

How is this possible? The Z4 M Coupe weighs only 22kgs more than the Z4 M Roadster and I\'ve heard that it\'s more rigid allowing for faster tracker times?

Also, the Z4 M Coupe is slower than the M3 Coupe (E46) despite it being 99kgs lighter, having the same engine and suspension as the M3!

Are we 100% sure that these Z4 M Coupe stats are correct? Something doesn\'t tie up with these 2 comparisons!