2004 BMW Z4 ROADSTER 3.0I Owner's Manual

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95
Connecting jumper cables
Always adhere to this sequence when
connecting jumper cables; failure to
observe this procedure can lead to sparks
at the battery terminals and pose an injury
hazard.<
The auxiliary jump-starting terminal located
in your BMW's engine compartment acts as
the positive battery terminal. Refer to the
engine compartment overview on page 82.
The cover is marked with a +.
1.Open the cover of the BMW auxiliary
jump-starting terminal. Do so by pulling
the tab
2.With the + jumper cable, connect the
positive terminal of the drained battery
and the positive terminal of the support
battery.
To do this:
Connect one terminal clamp to the pos-
itive terminal of the battery or to an aux-
iliary jump-starting terminal of the sup-
port vehicle.
Connect the second terminal clamp to
the positive terminal of the battery or to
an auxiliary jump-starting terminal of
the vehicle to be jump-started.
Your BMW is equipped with a special
nut, refer also to the engine compart-
ment overview on page 823.With the – jumper cable, connect the
negative terminals of both vehicles.
To do this:
Attach one cable clamp to the negative
battery terminal or to a suitable ground
on the engine or body work of the sup-
port vehicle.
Attach the second cable clamp to the
negative battery terminal or to a suit-
able ground on the engine or body work
of the vehicle to be jump-started.
Starting the engine
1.Start the engine of the support vehicle
and let it run for several minutes at a
slightly elevated engine idle speed
2.Start the engine of the other vehicle as
usual.
If the first start attempt is not success-
ful, wait a few minutes before another
attempt in order to allow the discharged
battery to recharge.
3.Allow the engines to run for several
minutes
4.Then disconnect the jumper cables in
reverse sequence.
Depending on the cause of the fault, have
the battery checked and recharged by your
BMW center.
Never use spray starter fluids to start
the engine.<

Giving and receiving assistance
96
Towing the vehicle
Always observe all applicable towing
laws and regulations.<
Towing with a commercial tow truck
>Use a wheel lift or flatbed carrier
>Do not tow with sling-type equipment.
Never allow passengers to ride in a
towed vehicle for any reason.<
Towing the vehicle with the front axle
raised
Vehicles with automatic
transmission
>Towing speed:
Maximum 45 mph / 70 km/h
>Towing distance:
Maximum 90 miles/150 km.
Vehicles with sequential manual
gearbox SMG
With the ignition on, move the selector
lever to position N, then turn off the igni-
tion.
Towing eyelet
The screw-in towing eyelet is stored in the
onboard tool kit, refer to page 88; be sure
that it remains in the vehicle at all times. It
can be attached at the front or rear of the
vehicle.
Access to towing socket
Front
Press out the cover panel with a screw-
driver inserted in the recess at the top.
Rear
Press out the cover panel with a screw-
driver inserted in the recess at the top.
Use only the towing eyelet supplied
with the vehicle and screw it in firmly
until it stops. Use the towing eyelet for tow-
ing on paved roads only. If you do not fol-
low these instructions, the towing eyelet
could be torn out and vehicle damage
could occur.
Do not tow the vehicle by any components
of the chassis or suspension, or lash them
down in any way. If you do, the compo-
nents could be damaged, possibly leading
to accidents.<

Reference
At a glance
Controls
Driving tips
Mobility
97

Reference
This chapter will help you find the desired
information as quickly as possible.
It contains the Technical data section as
well as the manual's index.

Technical data
100
Technical data
Engine data
Z4 2.5iZ4 3.0i
Displacement
Number of cylinderscu in/cmµ152.1/2,494
6181.7/2,979
6
Maximum power output
at engine speedhp/kW
rpm184/141
6,000225/170
5,900
Maximum torque
at engine speedlb ft/Nm
rpm181/245
3,500221/300
3,500
Compression ratioε10.5 10.2
Stroke
Borein/mm
in/mm2.95/75
3.31/843.53/89.6
3.31/84
Fuel-injection system Digital electronic engine-management system DME

Reference
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Mobility
101
Weights
Z4 2.5iZ4 3.0i
Curb weight
with manual transmission
with SMG
with automatic transmissionlbs/kg
lbs/kg
lbs/kg2,932/1,330
2,976/1,350
2,998/1,3602,998/1,360
3,020/1,370
3,042/1,380
Approved gross vehicle weight
with manual transmission
with SMG
with automatic transmissionlbs/kg
lbs/kg
lbs/kg3,483/1,580
3,527/1,600
3,549/1,6103,549/1,610
3,571/1,620
3,593/1,630
Load lbs/kg 551/250 551/250
Approved front axle load lbs/kg 1,720/780 1,742/790
Approved rear axle load lbs/kg 1,841/835 1,863/845
Luggage compartment capacity
with the convertible top compartment raisedcu ft/l
cu ft/l8.5/240
9.2/2608.5/240
9.3/260
Never exceed either the approved axle loads or the approved gross vehicle weight.

Technical data
102
Dimensions
All measurements in inches/millimeters. Smallest turning circle dia. 32 ft 2 in/9.8 m.