Criticisms
- Electro-mechanical power assist steering. The Z4 includes an electro-mechanical power assist steering system which earned the vehicle considerable criticism. The system was introduced as a fuel-saving device by removing hydraulic pump loads from the engine. BMW claims this system provides a "more dynamic drive" and a "more direct feel." Motor journalists and racing drivers complained, however, that this device gave the vehicle an artificial, synthetic or indirect steering feel. The BMW Z4 M on the other hand, only included conventional hydraulic assistance, said to have given the car a much more direct and communicative feel.
- Some motorsports journalists have on a couple of occasions complained on the harsh ride of a car they otherwise favor. The harsh ride of the vehicle is possibly explained by a change in rear toe angle when the Z4's rear suspension moves up and down, meaning it would begin to 'steer' from the rear on undulations found on less than track condition roads.
Read more about this topic: BMW Z4 (E85)
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