1987 PORSCHE 944 fuel additives

WARNING
Never carry additional fuel in portable containers in your car. Such containers,
full or partially empty, may leak, cause an
explosion, or result in fire in case of a
collision.
Porsche does not recommend the use of
fuel additives.
Do not use any fuel with octane ratings
lower than 91 RON or 87 CLC or AKI,
944S/944 Turbo 95 RON or 90 CLC or AKI.
Gasolines containing alcohol
Gasoline containing alcohol is available at gas
stations in some areas. The gas pump may not
be labeled to identify that alcohol is present in
the gasoline. If it is labeled, it may not identify
what amount and type(s) of alcohol
are used. We recommend you DO NOT use
fuels where the alcohol content cannot be
identified.
Gasolines containing methanol
DO NOT
use fuels containing methanol (methyl alcohol, wood alcohol). The use of fuel
containing this type of alcohol can result in
vehicle drivability and performance problems
and may damage critical parts of your vehicle's
fuel and emission control systems.
Gasolines containing ethanol
A mixture of unleaded gasoline and ethanol (ethyl alcohol, grain alcohol) is sold in some
areas. This mixture is sometimes called
"Gasohol".
You may use gasohol in your

Porsche, provided it contains no more than
10% ethanol, and the octane requirements for
your vehicle are met. However, we strongly
recommend to switch back to gasoline without
ethanol, if you experience any of the following
problems with your vehicle:
Deterioration of drivability and performance.
Substantially reduced fuel economy. Vapor lock and non-start problems, especially
at high altitude or at high temperatures.
Engine malfunction or stalling.
Continued use of gasohol under these
conditions may cause costly damage to the fuel system and the emission control system of your vehicle.

51

Gearshifting Manual Transmission


Maximum downshift points
5th to 4th gear
944 115 mph/1 80 km/h or 4300 rpm
944 S 123 mph/1 98 km/h or 5400 rpm
Turbo 130 mph/210 km/h or 5000 rpm
4th to 3rd gear
944 85 mph/1 36 km/h or 4750 rpm
944 S 91 mph/1 46 km/h or 5000 rpm
Turbo 96 mph/1 55 km/h or 4500 rpm
3rd to 2nd gear
944 58 mph/ 94 km/h or 4500 rpm
944 S 61 mph/ 98 km/h or 4600 rpm
Turbo 65 mph/1 05 km/h or 4250 rpm
2nd to 1st gear
944 34 mph/ 55 km/h or 3850 rpm
944 S 36 mph/ 58 km/h or 4000 rpm
Turbo 38 mph/ 62 km/h or 3700 rpm
Minimum upshifting points
1st to 2nd gear at 15 mph/24 km/h or
944 2850 rpm
944 S 2800 rpm
Turbo 2850 rpm
2nd to 3rd gear at 25 mph/40 km/h or
944 2800 rpm
944 S 2750 rpm
Turbo 2400 rpm
3rd to 4th gear at 40 mph/64 km/h or
944 3050 rpm
944 S 3000 rpm
Turbo 2750 rpm
4th to 5th gear at 48 mph/77 km/h or
944 2700 rpm
944 S 2650 rpm
Turbo 2300 rpm
The Porsche transmission with servo-lock
synchronization permits rapid and precise
shifting of gears. But be sure when changing
gears that the clutch pedal is fully depressed
to the floor, and that the gearshift lever is
completely engaged. The engine speeds for
the individual gears are listed on this page.
Reverse
Only shift into reverse when the car has
come to a complete stop.

The clutch pedal must be depressed and the
vehicle must be stationary before shifting into
reverse; only then move the gearshift lever to
the right (overcoming the spring resistance)
and then to the rear. Both back-up lights come on when the
transmission is put into reverse (with ignition
on).
For smooth shifting, observe the following shift points:
The specified maximum rpm figures should
not be exceeded when shifting down, as
otherwise the engine speed would be too
high. This applies to standard gear ratios only.

Please observe all local and national speed limits!
52

How Emission Control Works

When an automobile engine is running, it uses energy generated through the combustion of a mixture of air and fuel. Depending on whether
a car is driven fast or slowly or whether the
engine is cold or hot, some of the fuel
(hydrocarbons) may not be burned completely but be discharged into the engine crankcase
or exhaust system. Additional hydrocarbons
may enter the atmosphere through
evaporation of fuel from the fuel tank. These
hydrocarbons (HC), when released into the
air, contribute to undesirable pollution.
In addition, carbon monoxide (CO) and oxides of nitrogen (NOx) contribute to engine
emissions. They, too, are formed during the
combustion process and discharged into the
exhaust system.
To reduce these pollutants, your Porsche is
equipped with a precisely calibrated fuel
injection system to assure a finely balanced
air/fuel mixture under all operating conditions.

Oxygen Sensor
The oxygen sensor, installed in the exhaust
pipe continuously senses the oxygen content
of the exhaust and signals the information to
an electronic control unit. The control unit
corrects the air/fuel ratio, so that the engine
always receives an accurately metered air fuel mixture. .
Crankcase Ventilation
Through Crankcase Ventilation undesirable
emissions from the engine crankcase are not
permitted to reach the outside atmosphere.
These emissions are recirculated from the
crankcase to the air intake system. From here
the emissions mix with the intake air and are
later burned in the engine.
Catalytic converter
The catalytic converter is an efficient
"cleanup" device built into the exhaust system
of the vehicle. The catalytic converter burns
the undesirable pollutants in the exhaust gas
before it is released into the atmosphere.
The exclusive use of unleaded fuel is critically important for the life of the
catalytic converter. Therefore, only
unleaded gasoline without additives must
be used.
The catalytic converter will be damaged by

push or tow starting your vehicle
misfiring of the engine turning off the ignition while the vehicle is moving or
by other unusual operating conditions.
Do not continue to operate your vehicle
under these conditions, as otherwise fuel
can reach the catalytic converter. This
could result in overheating of the
converter.
Federal law prohibits use of leaded
gasoline in this car.
The Emission Control System and its other
related components are illustrated and
described on the following pages.
101

Emission Control System
1 Fuel pump
2 Fuel filter
3 Pressure damper
3a Pressure regulator
4 Injector
5 Auxiliary air valve
6 Air flow meter
7 Throttle valve switch
8 Temperature sensor
9 Engine temperature sensor
10 Speed sensor
11 Reference mark sensor (TDC)
12 Control unit
13 Ring gear
14 Ignition coil
15 Distributor
16 Relay (fuel pump / control unit)
17 Oxygen sensor
18 Catalytic converter
19 Muffler

102

Engine Design Specifications
Design
Operating cycle
Lubrication
Cylinder block
Cylinder head
Valve operation
Camshaft drive
Crankshaft
Fuel injection 4-cylinder, in-line engine, front mount with two ba
lance-shafts
4-stroke
Pressure oil circulation from oil sump,
full flow filter
Light metal
Light metal
Overhead camshaft
(944 S: 2 overhead camshafts)
Spur belt drive
Forged, 5 main bearings
AFC (Air Flow Control) Power Train
Manual transmission
Gear ratio
1st gear
2nd gear
3rd gear
4th gear
5th gear
Axle ratio Gear ratio 944
3.600:1
2.125:1
1.458:1
1.071:1
0.730:1
3.500:1
3.889:1 Gear ratio 944 S
3.500:1
2.059:1
1.400:1
1.034:1
0.829:1
3.500:1
3.889:1 Gear ratio 944 Turbo
3.500:1
2.059:1
1.400:1
1.034:1
0.829:1
3.500:1
3.375:1
Clutch
Power transmission Single plate dry disc, hydraulically operated
Double constant velocity joints and drive shaft
Automatic transmission 944
Gear ratio 1st gear
2nd gear
3rd gear
Reverse gear
Axle ratio
Clutch 2.714:1
1.500:1
1.000:1
2.429:1
3.455:1
Hydrodynamic torque converter
109

Filling Capacities
Engine oil With filter change approx. 6.34 (Turbo: approx. 6.87) U.S. qts. or 6 (Turbo: approx. 6.5) liters.
Check oil level with dipstick a few minutes after e ngine has stopped. The difference between
the max. and min. marks on the dipstick is approx. 1 U.S. qt. or 1 liter.
Only use brand name oil which has been tested and a pproved by Porsche.
Your authorized Porsche dealer will be glad to advi se you.
Porsche does not recommend the use of oil additives . See also "Engine Oils".
Cooling system with heating
Approx. 8,2 U.S. qts. or 7,8 liters. Factory filled to -31°F (-35°C). Only use phosphate-free
anti-freeze containing ethylene glycol recommended for aluminum engines and radiators.
Manual transmission
Approx. 0.53 U.S. gal. or 2.0 liters. Use hypoid oi l SAE 80 labeled "For Service API/GL4 or
Mil-L 2105".
Automatic transmission with
torque converter Approx. 1.72 U.S. gal. or 6.5 liters ATF Dexron®. At oil c hanges 3 U.S. qts. or 2.8 liters are
required.
Differential of automatic transmission
Approx. 1 U.S. qts. or 1 liter hypoid oil SAE 90 ac cording to API classification GL 5 or
Mil-L 2105 B.
Power steering
Approx. 0.63 U.S. qts. or 0.6 liter ATF Dexron®
Fuel tank Approx. 21.1 U.S. gals, or 80 liters including a re serve of 2.1 U.S. gals, or 8 liters.
Unleaded fuel only! Minimum octane rating 944 91 RO N (87 CLC or AKI ((R+M)/2) rating on fuel
pumps in U.S.A.), 944 S / 944 Turbo 95 RON (90 CLC or AKI ((R+M)/2) rating on fuel pumps in U.S.A.)
Brake fluid Approx. 0.42 U.S. pint or 0.2 liter. Only use brake fluid conforming to specifications
SAE J 1703, DOT 3 or DOT 4.
Windshield and headlight washer system
Approx. 1.59 U.S. gals, or 6.0 liters.
Refrigerant for air conditioning Approx. 33.5 oz or 950 g. Refrigerant R 12 (CCI2F2)
Cooling system mixing chart
(Approximate values)
Anti-freeze-Water
Consult your authorized dealer about
the approved anti-freeze mixtures. Temp, down to
-13° F (-25°C) -23° F (-30° C) -31° F (-35° C)
Anti-freeze
40%
45%
50% Water
60% 55% 50%
Anti-freeze

3.1 liters / 3.3 U.S. qts.3.5 liters / 3.7 U.S. qts.3.9 liters / 4.1 U.S. qts.
Water
4.7 liters / 5.0 U.S. qts.
4.3 liters / 4.5 U.S. qts. 3.9 liters / 4.1 U.S. qts.
110

Engine Oils
Use only engine oils which meet the
specifications designated by PORSCHE. Your Porsche dealer will be glad to advise you on
the correct type of oil for your engine.
All current engine oils are compatible with each other, i. e. when making an oil change it
is not necessary to flush the engine if you
wish to use a different brand or grade of oil. Since, however, each brand of oil has a
special composition, you should, if possible,
use the same oil brand if it becomes
necessary to top up between oil changes.
PORSCHE engines have long intervals
between oil changes. You can make best use
of these long oil change intervals by using
multigrade oils since these are largely
independent of seasonal fluctuations in
temperature.
If your vehicle is used frequently in stop-and-
go traffic in winter, the engine will not always
be properly warmed up. Condensation from
products of combustion may accumulate in
the oil. In this case, it is advisable to change
the oil in spring so that your engine once
again has a 100% efficient engine oil.
Engine oil performance class

Engine oil is not only a lubricant, but also
serves to keep the engine clean, to neutralize
the dirt which penetrates into the engine
through combustion and to protect the engine
against corrosion. To perform these functions, the oil is provided with additives which have
been specially developed for these functions.
So-called mineral oils are produced directly
from crude oil. The oils can be further refined
(hydrocrack oils) or totally converted through a number of chemical processes (synthetic oils). These oils are structurally more efficient and
require fewer additives than simple mineral
oils.
The efficiency of an oil is expressed, for
example, by the API classifications which are
divided into categories "S" and "C". The
degrees of quality are expressed by final
letters in alphabetical order: The requirements for PORSCHE engines are API class SE/CC
to SF/CD.
Viscosity
Like all liquids, engine oil is viscous when
cold, and thin-bodied when warm.

The viscosity of an oil is expressed by its SAE class. For cold viscosity (measured at
temperatures below 0°C) the SAE class is
given as a number and the letter "W" (as in
winter); for hot viscosity (measured at 100°C) the SAE class is given only as a number. The viscosity of an oil is, therefore, always the same if it has the same number of an SAE
class.
E. g.: A 10 W -30 oil and a 10 W-40 oil have
the same viscosity when cold (below 0°C);
when hot (at 100°C) the oil with the number 30 is thinner than the oil with the number 40.
Single-grade/multigrade oils
Oils with two viscosities are called multi-g
rade oils; oils with only one viscosity are termed
single-grade oils.
Single-grade oils can only be used for the
narrow temperature range identified by their
SAE number; multigrade oils cover a wider
temperature range (see chart).
Fuel efficient oils
Fuel efficient oils reduce internal friction in the
engine. PORSCHE approves only fuel
efficient oils which are structurally so stable
that they can be used in PORSCHE engines
both as summer and winter oils (see chart of
areas of application for oils of different
viscosity). These conditions are currently
fulfilled by synthetic or hydrocrack fuel
efficient oils.

111

Tires, Rims 944 / 944 S
Tires, Rims
(Rim offset 52,3 mm) 215/60 VR 15 front and rear on rims 7 J x 15 H2
or 205/55 VR 16 on 7 J x 16 H2 front and 225/50 VR
16 on 8 J x 16 H2 rear
Snow tires
(Rim offset 52,3 mm) 195/65 R 15 80 Q M + S front and rear on rims 7 J x
15 H2
or 215/60 R 15 80 Q M + S front and rear on rims 7 J X 15 H2
or 205/55 R 16 80 Q M + S front and rear on rims 7 J x 16 H2
or 205/55 R 16 80 Q M + S on rims 7 J x 16 H2 front and
225/50 R 16 80 Q M + S on 8 J x 16 H2 rear
The load rating and identification letter for allow able maximum speed (e.g. 80 Q/VR 15)
represent minimum requirements.
Collapsible spare tire 165-15 8 PR 89 P on rim 51/2 J x 15 H2
Tire pressure always 36 psi (2.5 bar/atm.), front o r rear use. Maximum speed is 50 mph (80km/h).
Cold tire pressure front 29 psi (2.0 bar), rear 36 psi (2.5 bar)
Snow chains Should snow chains be necessary, they m ust be mounted on the drive wheels only. Maximum speed is 30 mph (50
km/h).
Always use Porsche - approved snow chains.

Important hint:
For tires with VR quality standard , there are currently no final standards concerning tire strength at speeds above 210 km/h. For this r eason,
only use tire makes and types tested by Porsche.
If you intend to use other than original equipment wheels, be sure that they conform to Porsche specif ications for your model. Check with your
Porsche dealer regarding the correct wheel specific ations for type and model year.

112