Porsche 911 Turbo User Handbook Manual page 21

Engine cooling. ECU is responsible for all engine-
related functions and assemblies
The 911 Turbo engine features (see diagram), e.g., Variable
cross-flow water cooling with fully Turbine Geometry (VTG),
integrated coolant management. VarioCam Plus and the electronic
This technology ensures a consist- throttle system – one of the
ent flow of coolant to each of essential prerequisites for the
the engine's cylinders. Waste heat standard Porsche Stability
from the oil is transferred to Management (PSM). The results:
the coolant via two oil/water heat optimum economy, emissions
exchangers. The coolant is routed and performance, regardless of
through twin radiator modules driving style.
ahead of the front wheels and a
centrally placed unit in the nose. Another important task performed
by the engine management sys-
tem is cylinder-specific knock
Engine management.
control. By preventing pre-ignition
at high engine speeds, this func-
Optimum performance is assured tion can avert costly damage to
at all times with the aid of the pistons and cylinders. Since
the Motronic ME7.8.1 engine temperatures tend to vary across
management system. This powerful the engine, each cylinder is
monitored separately. If a
risk is detected, the individual
ignition timing is adjusted.
The EU-compliant on-board
diagnostics system provides
continuous fault detection as
well as early warning for the
exhaust and fuel supply sys-
tems. This actively prevents
harmful emissions while
maintaining consistent rates of
fuel consumption.
· 50 ·
Input data
Engine speed (from crankshaft)
Camshaft phase angles
Engine load
Pressure upstream from throttle
Throttle-valve angle
Throttle-pedal position
Lambda signal
Knock sensor signal
Temperatures
– coolant
– airflow upstream from throttle
– engine oil
– air in engine compartment
– ambient air
Vehicle speed
Air-conditioning settings
Engine immobiliser status
Clutch pedal switch
Ambient air pressure
Exhaust-gas temperature
Moment interface to Porsche
CAN interface to transmission
Stability Management (PSM)
911 Turbo |
Used to regulate/control
Ignition
Fuel injection
Throttle valve
Heating elements in Lambda sensors
Fuel pump
Fuel-tank venting
VarioCam Plus
– camshaft phase angle
– valve lift control
Electronic controller for
Variable Turbine Geometry (VTG)
Bypass valve
Secondary air injection
Engine-bay fan
Starter
On-board diagnostics
Air-conditioning compressor
Interface to instrument cluster
Radiator fans
CAN interface to
all-wheel drive control unit
· 51 ·
Drive