Lotus Elan

Crazy rev counter

PostPost by: Jaybee » Sun Oct 13, 2013 7:47 pm

Ever since fitting accuspark ignition trigger ( no control box or special coil) the rev counter reading bears no relation to the engine revs plus it bounces all over the place. Any body know the answer ? Please no guessing ,might be. Just the facts would be great thanks. John
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PostPost by: billwill » Sun Oct 13, 2013 9:39 pm

There are several topics where the rev counter has been discussed recently.

In a nutshell:

The new sensor has changed the shape of the pulses in the coil you may need to get your rev counter converted to voltage sensing instead of current sensing.


Read all about it by reading the topics found by doing a seach for tachometer, i.e click this:
http://www.lotuselan.net/cgi-bin/search ... oom_sort=0
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PostPost by: AHM » Sun Oct 13, 2013 10:09 pm

It is possible to get it to work reliably.
Make sure all of the connections are good from ignition to coil, rev counter etc.
adjust the size and position of the loop of wire
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PostPost by: rgh0 » Mon Oct 14, 2013 12:59 am

Also with a current sensing tacho dont power the electronic ignition from the positive terminal of the coil as the instructions typically show as the tacho then also picks up the power pulses that go to the electronics in addition to the power pulse that are powering the ignition coil.

cheers
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PostPost by: bob_rich » Mon Oct 14, 2013 7:00 pm

Hi Jon

There have been a few posts on this. attached is one related to the accuspark which I hope will help

Best of luck

Bob

lotus-electrical-f38/tacho-after-accuspark-and-ballast-resistor-t26558-15.html
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PostPost by: pharriso » Tue Oct 15, 2013 10:31 am

John, I just went through this, there is info on the board but in summary I did the following:

1. Fitted the Spiyda RVI --> RVC tacho conversion available at www.spiyda.com
2. Connected the 2 white wires that went to the tacho together
3. Ran a new wire from the Coil -ve terminal to the tacho.

Works perfectly now! :D
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PostPost by: Jaybee » Wed Oct 16, 2013 5:57 pm

Thanks all for the info ill work through the suggestions. John.....
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PostPost by: stugilmour » Thu Oct 17, 2013 6:00 pm

Phil, that looks like a great product. I sent mine away to Nisonger for conversion, but this looks like a similar DIY solution. The Nisonger conversion was $360 and about six weeks turnaround if you don't feel up to the tach disassembly.

Here is a direct link to the product Nice set of install instructions with calibration method using your lap top. Pretty cool. About $65 plus shipping and they take PayPal.

https://www.spiyda.com/magento/index.ph ... board.html

Thanks for sharing. Had not seen that option before.
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PostPost by: pharriso » Fri Oct 18, 2013 11:33 am

If you're not handy with a soldering iron they will do the conversion for you for a total of $85 plus shipping. The instructions do not mention adding a resistor on the input...

I used their Tech support & even being 3200 miles away it was great!
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