Making its world debut at the 2010 North American International Auto Show (NAIAS) in Detroit and arriving at BMW dealers in the Spring is the new BMW Z4 sDrive35is. This is the rather awkward name for the high-performance version of the 3.0 twin-turbo version of the BMW Z4 Roadster.
The new Z4 model features a revised air intake and increased turbo boost pressure release a maximum output of 335hp at 5900rpm and 332 lb-ft from 1500 to 4500rpm.
The enhanced engine management of the BMW Z4s includes an electronically-controlled overboost function to briefly increase torque under full load by another 37 lb-ft. This temporary torque peak of 369 lb-ft gives the car a significant increase in acceleration. This gets the car from 0-60mph in just 4.7 seconds, although the top speed is again limited to 155 mph.
The exhaust system has been tuned to give the car a unique sound thanks to special baffles and a unique set of mufflers. The sound is characterized by a deep rumble with a focus on the low frequency sound range.
The BMW Z4 sDrive35is offers the extra performance without an increase in fuel consumption or emissions. Its figures are expected to match those of the regular BMW Z4 sDrive35i with Double-Clutch Transmission on the EPA test cycle. Although this could be thanks to the inclusion of technologies such as Brake Energy Regeneration, Electric Power Steering, and on-demand operation of engine accessory units.
The standard 7-speed Double-Clutch Transmission (DCT) in the BMW Z4s has been reprogrammed to complement the car’s sporty nature. When shifting gears manually or within the SPORT and SPORT+ modes, the transmission will shift faster and allow a greater increase in torque before shifting. It also features a Launch Control function for maximum acceleration from a standstill.
Furthermore, the BMW Z4s includes new M Sport upgrades such as Aerodynamics and adaptive suspension. The latter lowers the ride height 10mm to improve the vehicle’s agility.
Special 18" five-spoke wheels round off the upgrades but 19" wheels are available as an option. Additionally, the new model is distinguished by a new front bumper with a matte aluminum trim bar in the outer intakes, plus a rear bumper with tailpipe surrounds as well as a rear diffuser finished in body color at the top and black underneath.
Inside, the Z4s gets a new thick-rimmed M leather steering wheel with gearshift paddles, an M driver’s footrest and sport seats. Grey-faced instrument dials feature the "sDrive35is" model designation. Further special features inside include an anthracite-colored BMW Individual roof lining, M door sill strips plus floor mats with colored piping and the "sDrive35is" logo, as well as M interior trim in Aluminum Carbon.
The range of leather upholstery is being increased to all versions of the Z4 Roadster, which get Kansas Walnut leather as an option. The BMW Z4 sDrive35is is available with a choice of six paintwork colors. In addition to Alpine White and the metallic colors Titanium Silver, Black Sapphire, Space Grey, and Deep Sea Blue, the Z4 Roadster is now available for the first time in Melbourne Red metallic. Regardless of the color chosen, the exterior mirror caps on the BMW Z4 sDrive35is are always Oxide Silver.