Car reviews - BMW - Z4 - sDrive20i and sDrive28i
Impressive new four-pot transforms BMW’s Z4 into a frugal fun machine
21 Dec 2011
IT HAS taken more than two years, but criticism levelled at BMW’s folding hard-top Z4 when it was launched in Australia in 2009 has finally been addressed, with weight, price and fuel savings coming in the shape of a new downsized N20 four-cylinder engine.
In addition to saving weight by reducing the cylinder count, the high-tech 2.0-litre unit employs twin-scroll turbocharging, direct fuel injection, sophisticated valve control and EfficientDynamics features such as idle-stop and regenerative braking, meaning six-cylinder performance is achieved without sacrificing four-cylinder efficiency.
BMW has also acted to squeeze out the engine’s maximum potential by offering it with ZF’s wonderful eight-speed automatic transmission for customers who cannot abide the six-speed manual.
Those measures combine to earn the Z4 a sizeable luxury car tax saving, and BMW is offering the engine in 135kW or 180kW tune, respectively replacing the naturally-aspirated 2.5-litre and 3.0-litre six-cylinder units.
Z4 sales have struggled this year, but things are now looking good for BMW’s re-priced and fully-turbocharged roadster line-up, which is now more competitive against the recently-redesigned Mercedes-Benz SLK.
The new engine looks good on paper and the new pricing should give Benz something to think about but can a force-fed four-pot offer the same top-down thrills as the Bavarian brand’s evocative six?
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