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Product Specifications
Part contents:
Snap connectors * 4
Mounting Screws * 4
Display unit * 1
Wiring loom * 1
Installation:
The display requires a cut out of the following
dimensions 66 * 110 mm. It is recommended to use MDF or ply wood to
mount the display then cover with vinyl. The screws included are
self-tapping.
Wiring:
The display has two negative connections and one
positive connection. These connections are ring type connections. It is
recommended that a suitable place on the bodywork (vehicles with
negative ground only) for the negative connection (Black Wires) and a
suitable place for the positive connection. The positive connection
(Red wire) must be only on when the vehicle is on to prevent the
battery being drained.
The lambda sensor input connection is the grey wire on
the unit. This grey wire is connected to the signal output on the
lambda sensor. This on many Bosch sensors, it is the black wire on the
sensor itself. It is possible to check which wire by using a voltmeter.
The sensor output will output between 0.1 - 1v when the sensor is warm.
Connect the grey wire by ideally soldering or by using snap connection
included.
The Output for the map sensor is the yellow wire. This
wire is connected to the output of the map sensor. This output is on
the Webber type sensors are the right connection, looking at the sensor
with the connector at the bottom. The correct wire can be determined on
other sensor types by connecting one wire of a multimeter to the
negative connection. With the ignition on, one wire will show about
+5v, one will show 0v and one will be in between 0 - 5V. It is the wire
in between 0 and 5 volts that is needed. Connect the yellow wire by
ideally soldering or by using snap connection included. On the Webber
sensors the signal wire, when looking at the display with connector on
the bottom, is the wire on the right.
Insert the temperature sensor in the manifold either in
the manifold or before the turbo. Before the turbo, the temperature of
the air entering the turbo can be monitored. After the turbo, and
intercooler if fitted, the temperature of the air charge entering the
engine can be monitored. The sensor is fitted by using a M14 nut
or by tapping a M14 * 1.5mm thread into a suitable position on the
intake manifold.
Display:
The display will give the actual values of the boost
pressure, temperature and the air fuel ratio.
On the first line:
The pressure is shown as Psi ranging from -12 Psi to
+14.5Psi for a 2 bar type, 22Psi for a 2.5 Bar display or +29 Psi for a
3 Bar type.
The temperature is shown in degrees Celsius. This is
ranges from 0 - 105C.
The air fuel ratio is shown from very lean to very rich
by the following display values:
V LEAN, LEAN, STOICH, RICH, POWER, V RICH.
The air fuel ratio should be RICH or POWER when on boost
as the cylinder temperature when at STOICH is high risking engine
damage.
The second line shows the BOOST pressure as a bar-chart
formed of a line of block characters which extends further from left to
right as the pressure increases from negative, through zero (i.e.
atmosphere) to positive.
The third line shows the Temperature as a bar-chart
formed of a line of block characters which extends further from left to
right as the temperature increases from 20C to 70C.
The fourth line is a similar line of block characters
showing A/F ratio but also includes the letter "L" for lean at the far
left, "S" for stoichiometric, and "R" for rich at the far right. The
ideal minimum value for when running the engine on boost is one block
higher than "S". When running on boost, the richer the mixture, the
lower the cylinder temperature and hence the lower the likelihood of
engine damage due to detonation.
Specifications:
Input range:
Temp 0 - 5v
Map 0 - 5v
Lambda 0 - 5v
Input impedance:
Temp - Current source 650 uA +- 2%
Lambda 1 Megohm
Map 2K2
Pressure Range:
2 Bar -12 to +14.7 Psi
2.5 Bar -12 to 22 Psi
3 Bar -12 to +29.4 Psi
Display response time:
Display samples and refreshes at approximately 3 times a
second, the bar graphs will refresh at a faster rate. Pressure accuracy
is +-1% fsd (full scale deflection) +-1 digit.
Temperature sensor deatils:
Thermsistor type ATS04 construction.
Respone time constant: Less than 5 seconds.
Display type:
STN LCD negative. White characters on blue background.
Wide temperature range.
Power specifications:
Voltage 8 - 16V Reverse polarity protected.
Current: 70 mA at full brightness, 5 ma dimmed .
Fuse: 1A Quick blow 20 mm inline fuse.
Calibration:
The map sensor is calibrated to give 0 Psi at sea level
pressure. Due to the map sensor age, or altitude this can result in a
value that is not zero at atmospheric pressure. The turbo display can
compensate for a -10 to + 10 percent variation of pressure output when
turned on. The pressure is sampled 2 seconds after turn on. When
calibration mode is chosen leave 2 seconds between turning ignition on
and turning the starter motor. If the pressure is outside this 10
percent margin (i.e. the engine is running when display is turned on)
the default value is used.
Calibration mode requires the bottom (3) jumper
fitted. To turn calibration mode off just remove a jumper. The default
value for 0psi is used. Remove jumper carefully using tweezers, being
careful not to damage the circuit board.
Pressure can be shown as Psi or as Bar. When the centre
(2) jumper at the rear is removed the pressure is shown as Psi.
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