2004 PORSCHE 911 GT3 ECU

Cassette tapeplayer

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Caution!
To avoid damage tocassette tapeplayer and
tapes.

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Use only cassette tapesofgood quality, hav-
ing nodamage.

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Avoid usingtapes withatotal playing timelong-
er than 90minutes.
Longer tapesarenotrecommended because
of the thinner crosssection ofthe tape.

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Besure thatthetape isnot slack andthat the
label isfirmly secured onthe shell before in-
serting thecassette intotheplayer.

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Have thetape firmly wound around thetape by
turning thehub with apencil orsimilar items.
Be careful nottotouch theexposed tapesur-
face.

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When notinuse, take thecassette outofthe
player, putitback intoitscase andstore it
away fromdust, magnets anddirect sunlight.
Leaving thecassette tapeonthe dashboard in
the sun can damage thetape.

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Keep theplayback head,capstan andpinch
roller clean.

106
Controls, Instruments
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Remove tapecoating residueaccumulated on
the head, capstan andpinch rolleronceor
twice amonth.
A cleaning tape,which candothis, should be
available inaudio stores.

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Donot oilany part ofthe tape player anddo
not insert anyobject otherthanacassette
tape intotheslot.

Compact discplayer

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Caution!
To avoid damage tocompact discplayer and
discs.

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Use only compact discslabeled asshown, hav-
ing nodirt, damage orwarpage.

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Never attempt todisassemble oroil any part of
the player unit.
Do not insert anyobject otherthanadisc into
the slot.
Remember therearenouser-serviceable parts
inside thecompact discplayer.
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Donot allow thedisc tosustain anyfinger-
prints, scrapes orstickers onthe surfaces.
This maycause poorsound quality.
Hold thedisc only onthe edge orcenter hole.

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When notinuse, take thedisc outofthe play-
er, put the disc back intoitscase andstore it
away fromdust, heat,damp anddirect sun-
light.
Leaving thedisc onthe dashboard inthe sun
can damage thedisc.

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Ifthe disc gets dirty, clean thedisc bywiping
the surfaces fromthecenter tothe outside in
a radial direction withasoft cloth.
Do not use aconventional recordcleaner or
anti-static recordpreservative.
Disc cleaners areavailable inaudio stores.

RoofTransport System

Follow theseparate instructions forfitting
the Roof Transport System.

Fitting commercially availableluggageracksis

not
possible.
The
Porsche RoofTransport System
allowsthe
transport ofvarious sportsandhobby equipment.
Your authorized Porschedealerwillbepleased to
inform youabout themany usesofthe Roof Trans-
port System.
Controls, Instruments
A

Warning!
Risk ofan accident, lossofcontrol anddam-
age tothe vehicle.

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Completely removetheRoof Transport Sys-
tem before usinganautomatic carwash.

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Fitthe side support elements ofthe basic car-
rier only inconjunction withthetransverse sup-
porting pipes.

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The permissible useableloadof165 Ibs
(75 kg), thepermissible totalvehicle weight
and thepermissible axleloads mustnotbe
exceeded. Please observe thechapter "WEIGHTS" on
Page 186.
Items ofluggage mustnotproject substantially
beyond theside ofthe load area.
Distribute loadevenly, withheavy itemsaslow
as possible.
Every itemmust befixed andsecured tothe
basic carrier witharope orlashing strap(do
not use elastic rubbertensioners).

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Before everyjourney, andatregular intervals
during longtrips, check thatRoof Transport
System andload aresecure.
Retighten ifnecessary andsecure additionally
by locking.
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Inthe loaded state,adjust maximum speedto
the nature, sizeandweight ofthe load being
carried.
In no case, however, shouldyoudrive atmore
than 90mph (140 km/h).

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With thebasic carrier installed andnoload, do
not exceed amaximum speedof110 mph
(180 km/h) sincedriving stability willbead-
versely affected.
Adapt yourdriving styleandspeed tothe
changed conditions.
Nevertheless, Porscherecommends thatyou
do not exceed theposted speedlimit.

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Driving, brakingandsteering behavior ofthe
vehicle change duetothe higher center of
gravity andthegreater wind-resistant area.
You should adaptyourdriving styleappropri-
ately.

Note

Since fuelconsumption andnoise areincreased
with theRoof Transport Systeminstalled, itshould
not remain onthe car ifit is not inuse.

Gearshifting

The positions ofthe gears areshown onthe gear-
shift lever.

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Warning!
Risk ofan accident.

~ Always checkthemovement ofthe clutch ped-
al before driving andmake surethatitis not
obstructed byafloor matorany other object.
~ Secure thefloor mattoprevent itfrom sliding
into positions thatcould interfere withthesafe
operation ofyour vehicle.
Your Porsche dealercanoffer youfloor mats
of the correct sizeincluding asecuring possi-
bility.

To avoid damage tothe clutch andtransmis-
sion:

~ Always depress theclutch pedalfullywhen
changing gears.
Make surethatthegearshift leveriscomplete-
ly engaged.
~ Only shiftintoreverse whenthecar has come
to acomplete stop.
~
Permitted enginespeed

~ Change intoahigher gearbefore theneedle
reaches thered mark onthe tachometer, or
ease offthe accelerator.
If the redzone isreached duringacceleration, fuel
feed isinterrupted.

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Caution!
To avoid severe engine damage.

~ Always observe theengine rpmbefore down-
shifting toalower gear,soyou donot exceed
the maximum enginerpm.

Reverse

~ Depress theclutch pedalforseveral seconds
before shifting intoreverse.
Only then move thegearshift levertothe left,
overcoming thespring tension, andthen tothe
front.
Both back-up lightscome onwhen thetransmis-
sion isput into reverse (withignition on).
Controls,Instruments
109

A-
Passenger's side

B -
Driver's side

Wiper Blades

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When wiper performance deteriorates,replace
the wipers,

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Please observe thechapter "CARCARE IN-
STRUCTIONS" onPage 130.
A

Caution!
Risk ofdamage
if
the wiper armaCcidentally
falls back ontothe window.

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Always holdthewiper armsecurely whenre-
placing thewiper blade.

Risk ofdamage ifwiper blades thatarefro-
zen inplace areloosened improperly.

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Thaw thewiper blades beforeloosening them.
1.

Pull outignition key.
Fold wiper armaway fromthewindow.
2. Press together theplastic springofthe wiper
blade (rightarrow).
Pull wiper bladeoutofwiper arm.
3. Insert newwiper bladeandensure itengages.
Ensure thatthenew wiper bladegoesintothe
same position (direction ofspoiler) inthe wiper
arm andengages.
For wiper bladeAon the passenger's side,the
arch must facedown.
4. Carefully foldwiper armback ontothe win-
dow.
Maintenance, CarCare
129

Fabric, upholstery, carpetsand
floor-mats

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Use only avacuum cleaneroramedium stiff
brush.

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Remove stainsandspots withPorsche stain
remover.
The Porsche rangeofaccessories includesfloor-
mats toprotect thecarpets insummer andwinter.

A
Warning!
Risk ofan accident.

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Always checkthemovement ofthe pedals be-
fore driving andmake surethatthey arenot
obstructed byafloor-mat orany other object.

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Secure thefloor-mat toprevent itfrom sliding
into positions thatcould interfere withthesafe
operation ofyour vehicle -do not liethem
loosely inthe vehicle.
Your Porsche dealerwillbeglad tooffer you
floor-mats ofthe correct sizeincluding asecur-
ing possibility.

136
Maintenance, CarCare
Alcantara

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Donot use aleather careproduct toclean
Alcantara.
For regular careitis sufficient toclean thecover
with asoft brush.

Cleaning whenlightly soiled

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Wet asoft cloth withwater oraneutral soap
solution andwipe offthe dirt.

Cleaning whenheavily soiled

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Wet asoft cloth withlukewarm wateror
thinned whitespiritanddabthedirt from the
outside in.
Safety
belts

If itbecomes necessary toclean thebelts, you
can useanymild washing agent.
Allow thebelts todry prior toretracting, butavoid
direct sunlight.

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Only usesuitable cleaners.
If unsuitable cleanersareused orany attempt
is made todye orbleach thebelts, theweb-
bing maybeweakened andthus constitute a
safety risk.

Tiredamage, puncture

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Check tiresforimbedded material,cuts,punc-
tures, cracks andbulges (sidewall)before
driving off.
In case oftire damage, whereitis uncertain
whether thereisabreak inthe plywith allits con-
sequences ortire damage causedbythermal or
mechanical overloading duetoloss ofpressure or
any other priordamage, werecommend thatthe
tire bereplaced forsafety reasons.
If one faulty tireisreplaced itshould benoted that
the difference intread depth onone axle must not
exceed 30
%.

Handling inconsistencies mayresult.

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Perform avisual inspection ifnecessary.
Tire replacements
If in doubt, contact yourPorsche dealeror
Porsche Importer ofyour country.
Use only tiremakes andtypes tested byPorsche.

If you donot use aPorsche recommended
replacement tire,make surethatyou
purchase yournewtires from areputable
tire dealer andthat thedealer complies with
all manufacturers warningsforthose tires.
Only tires withthesame make andwith the
same specification code(e.g."NO", "Nl"... )
can bemounted. Before
mounting newtires, check withyour
Porsche dealeraboutthecurrent release
status.
Use tires with"ZR" quality standards.
There
are currently nostandards concerning tire
strength atspeeds above150mph (240 kmjh).
Tires should bereplaced noless than onone axle
at the time.
Only tires ofthe same makeandtype must be
used. Mixed tiresarenotpermissible.
Initially, newtires donot have theirfulltraction.
You should therefore driveatmoderate speeds
during thefirst 60-120 miles (100-200 km).
If new tires areinstalled onlyonone axle, anotice-
able change inhandling occursduetothe different
tread depth ofthe other tires.
This happens especially ifonly reartires arere-
placed. However, thiscondition disappears asthe
new tires arebroken in.

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Please adjustyourdriving styleaccordingly.
Installation ofnew tires should onlybedone bya
qualified tiretechnician.
Valves

Rubber valvestems mustbereplaced everytime
a tire isreplaced.
For metal valves, theinstallation andreplacement
instructions mustbeobserved.
Use only genuine Porsche metalvalves.
Parking atthe curb

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Warning!
Hard impacts againstcurbs(ortraffic
islands) aredangerous andmay cause hid-
den tiredamage whichisnot noticeable until
later. Suchdamage canresult inaccidents
at high speeds causing severepersonal inju-

ry.

Depending onthe force ofimpact, theedge
of the rim can also bedamaged.

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Ifyou areindoubt, havethewheel checked by
an expert, particularly ifyou suspect damage
on the inside.

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Ifyou must driveoveracurb orother obstacle,
drive slowly andatan obtuse angle.Exercise
care when parking alongcurbs.
Practical Tips,Emergency Service

WheelBolts

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Warning!
Risk ofwheel boltbreakage andwheel sepa-
ration, resulting insevere personal injuryor
death.

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Follow allinstructions concerningwheelbolts.

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Always cleanthewheel boltsbefore fitting.

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Apply athin coat of
Optimoly TA
(aluminium
pastel onthe thread andbetween thebolt head
and movable spherical capring
(arrows).
The bearing surfaceofthe spherical cap
facing thewheel mustnotbegreased.

Practical Tips,Emergency Service
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Replace damaged wheelbolts.
Only usetheOriginal Porsche wheelbolts
specially designed forthis vehicle type.

Tightening torque

Tightening torqueofwheel bolts:

130 Nmj96 ftlb.

Wheel Securing Bolts

The wrench socketforthe wheel securing boltsis
in the tool pocket.
To loosen ortighten thewheel boltwith anti-theft
protection, awrench socketwiththeappropriate
coding mustbeused between thewheel boltand
the wheel-bolt spanner.

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When positioning thewrench socket, ensure
that itengages fullyinthe teeth ofthe wheel
bolt.
If the wheels havetobe removed atthe workshop,
please donot forget tohand overthewrench
socket forthe wheel securing boltsalong withthe
car key.
Changing
awheel

A
Warning!
Risk ofinjury. Thecarmay slipoffthe jack.

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Make surethatnoone isinthe vehicle when
jacking upand changing awheel.

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Always placethecar onstable supports ifwork
has tobe carried outunder thecar.

Risk ofdamage tothe brake discsofthe
Porsche Ceramic Composite Brake(PCCB).

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Always screwinboth assembly aidswhen
changing awheel.
1. Fully apply thehand brake, engage 1st gear
and withdraw theignition key.
2. Secure thecaragainst rollingaway,e.g.by
means ofwedges underthewheels onthe op-
posite side.
This isparticularly importantonslopes.

Battery care

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Ensure thatbattery issecurely mounted.

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Keep terminals andconnections cleanand
properly tightened.
Corrosion canbeprevented bycoating theter-
minals andconnections withpetroleum jellyor
silicone spray.

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Ensure thatvent caps aresecurely tightened
to prevent spillage.
Practical Tips,Emergency Service Checking
theelectrolyte fluidlevel
Generally, theelectrolyte levelmust bechecked
more ofteninsummer thaninthe winter, andmore
often when driving longdistances.

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When adding water,useonly clean vessels.
In no case mayalcohol (e.g.window cleaner
residues) bepermitted toenter thebattery.

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Unscrew andopen thefiller ventcaps ofeach
cell.
With thecarhorizontal, thefluid level should meet
the indicator markineach cell.

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Ifnecessary, topupwith distilled water.
Do not use acid.
Only fillup tothe mark, otherwise theelectro-
lyte willoverflow whenthebattery isbeing
charged andcause damage. Battery
charging
Automotive batteriesloosetheirefficiency when
not inuse.
The charge available inyour battery canbemea-
sured withabattery hydrometer.
We recommend thatthebattery voltage betested
by your Porsche dealerwhohastheappropriate
equipment.
If the car isnot driven forprolonged periods,the
battery mustbecharged atleast every 6weeks.
A discharged batteryallowsrapidformation ofsul-
fates, leading topremature deterioration ofthe
plates.