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Practical Standalone Tuning: Reluctor Sensor

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Reluctor Sensor

01.50

00:00 -A reluctor pick-up produces a sinusoidal waveform, which means the direction of current flow and the polarity of the voltage output is constantly changing.
00:09 The amplitude of the waveform also changes with engine speed.
00:13 This means the peak voltage produced increases with the engine RPM.
00:17 If your ECU has an option for tuning a pull-up on or off on the trigger input, this should be set to off with a reluctor sensor.
00:24 There are a couple of important points here, first we need to be certain that the polarity of the sensor wiring is correct.
00:31 A reluctor sensor has two terminals and it will produce a signal regardless which way the sensors wired.
00:38 In it's correct polarity the waveform will look like this, If the sensor's wired backwards, the signal will look like this, the waveform is basically inverted.
00:50 If the sensor is wired back to front, the engine will still run but it will result in the timing drifting as engine RPM increases.
00:58 At best this will result in wildly inaccurate timing and poor running.
01:03 In worst case scenarios it could cause engine damage so we need to be sure it's correct.
01:09 The best way to confirm the polarity is correct is to connect an oscilloscope to the sensor and look at the wave form the ECU is receiving.
01:17 This makes it very clear if the sensor's wired correctly, and you can check the waveform while cranking the engine, you don't actually need it running.
01:26 Most people don't have an oscilloscope though, so another option I use is to check for timing drift once the engine is running, we'll look at this in detail in the base ignition timing module.