As the 2011 Z4 sDrive35is, a new version of the Z4 roadster, will soon go on sale, details have been released. The car was given several major modifications, which include a revised straight six cylinder engine with Twin Turbo Technology, High Precision Injection and the M Sports Package, complete with M Suspension.
Unveiled at this year's North American International Auto Show (NAIAS) in Detroit, the new roadster will take point in the Z4 range and comes with a twin-turbo straight-six power unit that delivers 340 hp at 5,8000 rpm and 450 Nm of torque at 1,400 rpm.
Being teamed with a seven-speed Sport Automatic transmission with double clutch operation, the engine enables the Z4 to accelerate from zero to 62 mph in 4.8 seconds, with an electronically limited speed of 250 km/h (155 mph). Its standout features include the M Sport Package and the M Suspension, both of which are offered as standard on the sDrive35is.
The M Sport includes the M Aerodynamics Package (new front bumper with a horizontal trim bar in the outer air intakes finished in matt aluminum, rear bumper with specially accentuated surrounds on the exhaust tailpipes).
It also has several interior modifications that consist of the M leather steering wheel with gearshift paddles, M footrest and sports seats, grey faces for the instrument cluster, M entry strips, foot-mats with colored piping and the sDrive35is model designation, as well as M interior trim in aluminum carbon.
The car is offered in six paintwork colors: Alpine White, Titanium Silver, Sapphire Black, Space Grey, Deep Sea Blue and Melbourne Red metallic.
The whole car is lower by around 10 millimeters or 0.4 inches. This is due to the adaptive M Suspension which helps the car react quickly to unexpected manoeuvres. It also has four twin-sleeve gas-pressure dampers that can be continuously adjusted and with the interacting adjustment of the strokes, both rebound and inbound, the car acquires the precision it needs when entering a bend.
Another reason why the suspension is able to quickly respond to any situation is the central control unit. This is the unit responsible for adjusting its four dampers independent of each other using the data provided by its three accelerometers.
On the other hand, the damper harshness is regulated through the use of valves that have been fitted externally. These control how the damper fluid flows making the damper either softer or harder depending on the driving requirements or what the present conditions are.
The system’s reaction time is indeed exceptionally short considering that when the front wheels run over a bump or a hole in the road, the rear dampers are adjusted almost instantly.
BMW Z4 sDrive35is also has an Electric Power Steering that has a control map whose objective is to give the driver a clear and strong feedback by having the electric motor give some measure of power assistance. This also allows the driver to enter curves with the right precision no matter what the speed of the engine is.