adrianreeve
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| posted on 26/3/11 at 07:00 AM |
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Megasquirt and Tacho driving - opinions please
As far as I can see, there are two ways of driving a traditional coil driven tachometer if you have megasquirt:
1. Use the tacho output from the 'squirt, and add a relay coil in line to provide a voltage spike (as per extra efi website)
2. Use a tacho driver made of 3 diodes to directly drive the tacho from the coil pack, no connection to the megasquirt required. (Trigger wheels sell
one for £10)
Which method have you chaps used / would you recommend?
Thanks
Adrian
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snapper
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| posted on 26/3/11 at 07:17 AM |
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I have used the 3 diodes off a coil pack, this worked without issue.
I have used the Tacho out from the EDIS no problems.
I am now using Megajolt Tacho out on a Smiths electronic
I eat to survive
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matt_gsxr
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| posted on 26/3/11 at 07:43 AM |
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I have a coil (like the relay solution) driven from the low tension side (just one ignition output on my wasted spark system). This gives the right
number of pulses for my Aprilia rev counter.
I set it up this way as previously I was using the stock suzuki CDI, and haven't changed it.
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SPYDER
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| posted on 26/3/11 at 01:56 PM |
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I used method one. No problems.
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scudderfish
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| posted on 26/3/11 at 05:07 PM |
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I used the relay method, but the buzzing annoyed me as the relay was behind the dash and not in the engine bay. I now drive my tacho off my EDIS
module.
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paulf
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| posted on 26/3/11 at 10:01 PM |
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If you have an Edis then the pip signal sometimes works better than the tacho output on some rev counters, i have mine connected up like this and the
smiths type tacho works reliably .
Paul
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adrianreeve
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| posted on 27/3/11 at 02:44 PM |
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No edis, so I think I may go for the diode option.
Cheers
Adrian
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scudderfish
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| posted on 27/3/11 at 04:11 PM |
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My tacho just packed up  Time to fiddle with the wiring again....
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DaveFJ
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| posted on 28/3/11 at 12:18 PM |
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i went for the diode option.. a few cheap parts from maplins and a few mins with a soldering iron - jobs a good'n
Dave
"In Support of Help the Heroes" - Always
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austin man
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| posted on 31/3/11 at 08:45 PM |
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quote:
Originally posted by DaveFJ
i went for the diode option.. a few cheap parts from maplins and a few mins with a soldering iron - jobs a good'n
any chance of a diagram and detail of parts I have an acewell with Tacho which reads a little sporadic and a seperate 52 mm gauge which reads wrongly
so im going to have to do someting. I have megajolt and EDIS fitted
Life is like a bowl of fruit, funny how all the weird looking ones are left alone
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Snuggs
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| posted on 3/4/11 at 10:36 AM |
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quote:
Originally posted by austin man
quote:
Originally posted by DaveFJ
i went for the diode option.. a few cheap parts from maplins and a few mins with a soldering iron - jobs a good'n
any chance of a diagram and detail of parts I have an acewell with Tacho which reads a little sporadic and a seperate 52 mm gauge which reads wrongly
so im going to have to do someting. I have megajolt and EDIS fitted
Megajolt has a Tach Out that normally works.
U have U2U
Clive
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