AC Schnitzer ACS4 Z4

Most people demand as high a standard from their car as they do from their life partners. Firstly it must have innumerable inner values - in a car of this class, you expect pure performance. Secondly it must also have an extremely attractive external appearance. When the two come together, things can quickly get serious. This happened to us with the Z4. But after love at first sight, the first doubts started to appear, and suggested improvements followed. So the AC Schnitzer specialists set out to develop true love on wheels: The AC Schnitzer ACS4.

For the power plant of the most powerful variant at present - the BMW Z4 3.0i - a performance upgrade is already "in the pipeline". A development achieved in close collaboration with the BMW Motorsport Team Schnitzer, Freilassing.

The power of the AC Schnitzer ACS4 is increased by supercharger technology. The heart of the upgrade is a turbine supercharger which thanks to its toothed belt drive allows almost noiseless running. Only in the upper speed ranges is the characteristic compressor note - totally desirably! - produced.
The geometric design of this supercharger means it only needs maximum 38.000 rpm to achieve a boost pressure of 0.35 bar at an engine speed of 6.500 rpm. This increases the output of the standard power plant to a stately 295 HP / 217 kW and brings the maximum torque up by 80 Nm.

Thanks to the excellent efficiency of the supercharger, there is no need for an extra charge cooler. The high-tech bearings are permanently lubricated via an autonomous, dedicated oil reservoir. This has the advantage of allowing the two oil circuits to work independently.

http://www.netcarshow.com/ac_schnitzer/2003-acs4_z4/