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Tach reference

Old 01-04-2019, 05:52 PM
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Tach reference

2006 RX8... Should there be a tach reference while cranking?
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Old 01-04-2019, 06:14 PM
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What do you mean tach reference?
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Old 01-04-2019, 06:33 PM
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Like a movement in the tach when cranking. Aka starter is moving the engine at 500 RPM would you see that be reflected in the tach? Yes I believe when you crank you're car it will move the tach. But I haven't started my car in a min and looked for that
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Old 01-04-2019, 06:37 PM
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While engine cranks most cars, the tach will jump as engine turns.
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Old 01-05-2019, 01:42 PM
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Never really paid attention to that.

If you want to get an accurate cranking RPM number, use a live data capable OBD2 reader and put your foot down on the gas pedal, then crank. The reason is that a healthy 8 will start before the OBD2 picks up a consistent number.
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