piddy
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| posted on 9/3/06 at 05:42 PM |
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tacho signal
Hello All.
Where does a tacho get its signal from when using a modern engine such as a zetec.?
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k33ts
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| posted on 9/3/06 at 05:52 PM |
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depends on what ignition usually the - side of a coil.
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mark chandler
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| posted on 9/3/06 at 06:30 PM |
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Diesel cars tend to use the alternator
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MkIndy7
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| posted on 9/3/06 at 06:43 PM |
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In a zetec it would be the (green?) wire from the ECU or EDIS.
Wherever the manufactures get their Taco signal from, should be easy to find in the Heynes, provided your Taco accepts this kind of input.
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piddy
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| posted on 9/3/06 at 08:11 PM |
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Thanks chaps.
It's a wasted spark system so the coil idea doesn't work.
I was thinking the ECU so the Ecu or EDIS makes ense.
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Dusty
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| posted on 9/3/06 at 09:36 PM |
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My Haynes manual says white/black wire from terminal 11 on the ignition module.
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BKLOCO
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| posted on 10/3/06 at 09:50 AM |
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Without knowing which ECU it's hard to say where to pick up Tacho signal.
I'm having similar thoughts at the moment as I need to pick up a tacho drive sigmal from my MegaSquirt.
What occurs to me is that the standard signal from MS that goes to the EDIS comes directly out of the processor chip with no interface and I believe
it has a max current rating of about 10MA.
This is fine for EDIS but if you drive your tacho from this as well you may overload the output, depending of course what sort of current your tacho
sinks.
The answer I guess would be to install the "high current driver" transistor in MegaSquirt. This will still drive the EDIS ok but will
allow you to sink more current through the cars tachometer.
Experience is what you get when you don't get what you want!!! 
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