luke2152
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| posted on 17/6/14 at 11:26 PM |
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wiring tacho
Have a small 'universal' cheap tach from ebay. It is 4 wired (-,+,lamp, signal). Comes with no instructions. mk1 MX5 engine. Where
should I run signal to. I'm guessing not straight to HT leads. One of the coil wires maybe? Or perhaps off the cam angle sensor?
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snapper
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| posted on 18/6/14 at 04:50 AM |
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I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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luke2152
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| posted on 18/6/14 at 11:02 AM |
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Thanks. But do I need to take the signal off both coils? I take it the diodes are to stop the needle jumping around?
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r1_pete
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| posted on 18/6/14 at 11:56 AM |
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quote:
Originally posted by luke2152
Thanks. But do I need to take the signal off both coils? I take it the diodes are to stop the needle jumping around?
Yes, you need to take a feed from each coil pair, in a 4 cyl setup you need two ignition events per revolution.
The diodes are to prevent cross firing the coils.
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Smoking Frog
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| posted on 18/6/14 at 12:31 PM |
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If using MX5 ECU it has a signal wire for the tachometer.
Edit
Hang on, I think it comes from the igniter not ECU. Pin D yel/blu wire.
[Edited on 18/6/14 by Smoking Frog]
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luke2152
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| posted on 18/6/14 at 12:47 PM |
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Could just set tach to 2cyl and use one coil and just the zener diode? Im using megasquirt but didn't make the internal links for tach if i
remember right so ill just go off coils
[Edited on 18/6/14 by luke2152]
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