Electromotive xdi, Installation Manual & Users Manual

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XDI Manual Version 1.8 Page 25
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2017 Electromotive, Inc.
Advance Curve
0
5
10
15
20
25
30
35
0 1 2 3 4 5 6 7 8
10 12 14
RPM (x1000)
A
d
v
a
n
c
e
(
D
e
g
re
e
s
)
5.3 Measuring Timing
The XDI allows the user to measure the timing using a digital voltmeter. To convert the measured
voltage to the advance angle, simply multiply by 100, or move the decimal two digits to the right. There are
two places to measure this voltage. The first is on the unit itself as shown in
Figure 15 .
To measure the voltage from the unit, place your voltmeter’s positive probe in the ADV+ hole and place
the negative probe in the GND- hole on the XDI’s cover plate. Set your voltmeter to its lowest voltage setting.
The scenario shown in Figure 14 has the XDI advancing the timing 24 degrees BTDC.
The second place to measure the timing voltage is between the Advance Output wire (pink, pin 21 on
the XDI) and ground. This allows the timing to be measured in the event that the XDI is inaccessible during
driving conditions. The Advance Output wire serves a dual purpose and also controls the auxiliary rev limiter.
This is described in Section 5.6.
Figure 14
–
Timing curve for the
example discussed
and shown in Figure
12
Figure 15
–
Measuring timing with a digital
voltmeter