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Practical Standalone Tuning: Setting Base Ignition Timing - Post Startup

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Setting Base Ignition Timing - Post Startup

01.40

00:00 Getting the base timing close at cranking speed is enough to get the engine running, but we want to make sure, once the engine is running, that the timing is absolutely perfect.
00:09 I address this section after I've got the engine running and idling by itself, and once I know the mixtures are pretty close.
00:16 Once you're at this point, you can come back and check and set the base timing accurately.
00:22 The procedure is the same as before, only this time the engine will be running.
00:27 Depending on the trigger setup, you may find that, at a low idle speed, the ignition timing moves around a few degrees.
00:33 This is normal and not something to worry about.
00:36 If you increase the engine RPM to around 1,500 to 2,000 though, you should find that the timing becomes much smoother.
00:43 This is where we want to hold the engine speed while we set the timing.
00:48 Follow the same procedure we just went through and adjust the timing offset until the timing at the crankshaft matches what the laptop's displaying.
00:57 (whirring sound) The other test I perform at this stage is to rev the engine up to around 3,000 to 4,000 RPM and watch to make sure the ignition timing stays stable. If a reluctor crank sensor has been wired with the wrong polarity, you will see the timing drift significantly as the RPM rises, even though the ignition advance is fixed in the [ACU]. Once the timing is set, you can exit out of the Base Timing Mode, and you're ready to continue.