Haltech Platinum Pro 350z - Manual (Page 28)

User Manual – Haltech 350Z
7.4 Knock detection
The 350Z ECU has a built in knock detection circuit that allows the filtered output of the knock sensor to be
viewed and logged via the Knock Level Display channel.
 Knock Level Display – When knock is detected which exceeds the noise
threshold, then spikes will appear in this trace. The height of the spike
indicates how severe the knock event was.
 Knock Signal – This is the raw signal from the Knock sensor.
It is only displayed as a reference.
 Knock Threshold – This is the noise threshold which is used to mask the
engine's background noise. The table is where the thresholds are entered.
When displayed as a trace, the line on the trace follows the noise
thresholds.
Calibrating the Knock Threshold Table
The Knock Threshold table is filled out to mask any non knock related engine noise.
 To calibrate this table, drive the car at the RPM and Load and adjust the map until no spikes appear in
the Knock Level Display channel.
 Start with numbers that are low, then increase them until the spikes disappear from the Knock Level
Display.
 You may need to set the threshold higher under light load to ensure that noises under deceleration are not
mistaken for Knock. An engine under rapid deceleration can often generate noises that are similar to
knock.
Figure 21: The Knock Threshold Table
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