CHAPTER 6
RPM
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EVO5
6. RPM
The system can receive the RPM signal from three different sources:
n
From ECU
n
Through a square wave signal (8 to 50 V)
n
From the low voltage (from 150 to 400 V) of the coil
6.1 RPM from ECU
To get RPM from the ECU, please configure your device and enable RPM channel. RPM is one
of the many data flowing from your ECU.
6.2 RPM via a 5-50 V square wave signal or coil (150-400 V)
In case your engine is not managed by any ECU, the device can read the signal from the low
voltage of the coil (whose peak can be from 150 to 400 V) or from a possible square wave (the
peak can be from 5 to 50V). The pin labelled
"RPM"
reported in appendix
“Pinout”
receives
the signal.
The output, labelled
“GRAY TACH”
gives a
5-50V output that can be directly acquired
from EVO5.
If the output is not available from the
ignition system, the system has to be c
onnected to the low voltage of the coil, as
shown in the following schematic.
The image shows an example of wiring for the ignition system.
Point 1
: Low voltage of the coil
Point 2
: Connected to the spark plug
Point 3
: Connected to the +12V of the
battery
After connecting the RPM signal, please use
the software Race Studio 3 for enabling the
RPM channel.
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