Table of Contents E85 M Roadster Subject Page Introduction .3 Technical Data.4 Drivetrain.5 Chassis.6 Body/Interior Equipment .7 Electrical System .8 Bus Systems.8 Initial Print Date: 03/06 Revision Date: E85 M Roadster Model: E85 M Roadster Production: from March 2006 ■MICTIWIS After completion of this module you will be able to: • Identify the changes between the E85 LCI and the M Roadster variant 2 E85 M Roadster Introduction The Z4 M Roadster will be introduced to the market as from March 2006. Although the basic concept and proportions are identical to those of the E85 LCI, the new Z4 M Roadster differs considerably, not only in terms of performance. For example, striking features include the precision lines of the bonnet as well as the front apron with large air inlets. Further distinguishing features include: • M ore distinct kidney grills. • 18 inch wheels with exclusive M design • Rear bumper cover with horizontal diffuser • Chrome-plated pairs of exhaust tail pipes • Three exclusive M exterior colors (Imola red, Sepang bronze metallic and Interlagos blue metallic). / 3 E85 M Roadster Technical Data Dimensions Vehicle length/width/height 161.9/70.1/51.3 in Track, front/rear 58.5/59.7 in Wheelbase 98.3 in Weight Unladen 3197 lbs Weight distribution, front/rear 50.7/49.3 % Engine Liter/type/valves 3.2/DOHC inline 6/24 Bore/stroke 3.58/3.43 inch Nominal output/rpm 330/7900 hp Max. torque/rpm 262/4900 lb-ft Performance Drag coefficient 0.38 Cd l Top speed 155 mph 2 Acceleration 4.9 sec 3 Fuel Consumption Manual Transmission (mpg) 17.8/29 city/highway Wheels Wheel dimensions - front (standard) 17 x 8.0 Wheel dimensions - rear (standard) 17 x 8.0 Material Cast alloy Wheel dimensions - front (optional) 18 x 8.0 Wheel dimensions - rear (optional) 18 x 8.5 Material Cast alloy 1: Top speed limited electronically. 2: BMW test results. Actual acceleration results may vary, depending on specification of vehicle, road and environmental conditions, testing procedures, and driving style. These results should be used for comparison only and verification should not be attempted on public roads. BMW urges you to obey all posted speed laws and always wear safety belts. 3: EPA-estimated figures are for comparison purposes only. Your actual mileage will vary, depending on speed, driving habits, trip length, and driving conditions; actual mileage will most likely be lower. 4 E85 M Roadster Drivetrain The 3.2 liter in-line 6-cylinder engine (S54B32) is known from the E46 M3.The high¬ speed concept of this engine allows the Z4 M Roadsterto develop 330 bhp at 7900 rpm. The maximum torque is 262 Ib-ft at 4900 rpm. The maximum speed is 8000 rpm. With this engine, the vehicle has a power-to-weight ratio of 5.6 kg/kW and accelerates from 0 to 60 m/h in 4.9 seconds.The Z4 M Roadster's top speed is governed at 155 m/h. Fora sports car, the concept of a high speed engine is optimum in combination with a short overall gear ratio as the available engine torque can be optimally converted to thrust at the rear axle. The Z4 M Roadster is equipped with the speed-sensitive variable differential lock as known from the M3. The vehicle is equipped with a 6-speed manual gearbox with typical short shift paths is standard. An automatic gearbox will not be offered. A new engine management system, MSS70, has been specially developed forthe E85 M Roadster. There are a few modifications compared to the MSS54 that are already known from the S54B32 engine of the M3 (E46). The changes are: • Alternator now controlled via a BSD interface (bit-serial data interface). • The sport button is now resistance coded. • The fuel pump is activated via the PT-CAN (separate diagnosable control unit). • The previous oil sensor is replaced by the oil quality sensor. 5 E85 M Roadster Chassis In line with the engine performance, the chassis of the Z4 M Roadster has been equipped with a sporty M chassis with variable differential lock. Together with the extremely powerful brake system (from the M3 CSL) as well as the 18 inch aluminium rims (front 225/45 ZR18, rear255/40 ZR18), the vehicle offers an outstanding overall concept in terms of driving dynamics. The rear axle essentially corresponds to the rear axle known from the M3 E46.The front axle has been adapted from the Z3 M Roadster. The steering is similarthe steering of the M3 E46.The EPS system utilized in the base E85 is not used. The steering system in the M Roadster is a rack and pinion design with power hydraulic assist (pump driven by the engine via pulley/belt). Run-flat tires are not available on the Z4 M Roadster. Instead the vehicle used the M tire mobility tire inflation kit for repairing punctures. This kit is located in the luggage com¬ partment. 6 E85 M Roadster Body/Interior Equipment The M sports seats as well as the M leather steering wheel are immediately noticeable at first glance in the interior. Further M-specific details include: • M shift knob, illuminated • Aluminium sill strips with M logo • M color design of instruments (black dial face, white numerals, red pointer, white permanent illumination) • Four exclusive M leather trim styles in fulled Napa leather. Some exterior M-specific details include: • Squarer lines on the hood: achieved by a new rolling/pressing process and gives the hoodline a distinctly aggressive appearance. • A new front bumper cover with large cooling air inlets • M badging on frontfenders and reartrunk lid • Elimination of the fog lights (not available due to air duct openings) • M signature 4 exhaust tailpipes 7 E85 M Roadster Electrical System A new feature of the electrical system is the position of the battery in the luggage com¬ partment. The battery is maintenance free (as on the M 5 E60). Bus Systems The Z4 M Roadster is equipped with the advanced crash and safety management sys¬ tem (ACSM)The ACSM is described in the training material for 5T503 Passive Safety Systems. E85 Bus Overview from 01/2006 ** Separate control unit with diagnostic capabilities BKAW KjMT 8 E85 M Roadster