AC Schnitzer tunes Z4 to 355bhp
23 September 2009

German tuner AC Schnitzer has tuned the BMW Z4 Roadster, creating the ACS4 Turbo.

The modifications are designed for the range-topping sDrive35i. ECU changes mean the twin-turbocharged, 3.0-litre engine goes up from 302bhp to 355bhp.

See the BMW Z4 ACS4 Turbo picture gallery

The result is in an increased top speed of 178mph and a reduced 0-62mph dash of 4.9 seconds, a fifth of a second faster than the standard Z4. AC Schnitzer has also included a new set of springs and a sports exhaust system in the upgrade, to provide a more sporty ride and handling package

The ACS4 also has a new aerodynamic package, which includes a front spoiler, new side air vents for improved brake cooling, a two-piece rear spoiler and a chrome front grille.

It also sits on a set of 18-inch alloys, although the options list includes 19- and 20-inch wheels.

The interior has also undergone some minor changes – the Aachen-based tuner has put an aluminium cover on the iDrive controller, pedals and gearstick.

Our Verdict

BMW Z4
The BMW Z4 has more comfort and added practicality, but has it gone soft?

The BMW Z4 is a fine-looking two-seat roadster with indifferent driving dynamics

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Driven this week

At the moment, upgrades are only available on the sDrive35i, and while there's no word yet on prices, a premium over the £37,060 list price would likely mean the ACS4 costs around the same as the £40,486 Porsche Boxster S.

Tom Richards

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Our Verdict

BMW Z4
The BMW Z4 has more comfort and added practicality, but has it gone soft?

The BMW Z4 is a fine-looking two-seat roadster with indifferent driving dynamics

Find an Autocar car review

Driven this week