Crazy rev counter
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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
- Jaybee
- First Gear
- Posts: 31
- Joined: 26 Mar 2013
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
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
Bill Williams
36/6725 S3 Coupe OGU108E Yellow over Black.
36/6725 S3 Coupe OGU108E Yellow over Black.
- billwill
- Coveted Fifth Gear
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- Joined: 19 Apr 2008
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
Rohan
cheers
Rohan
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rgh0 - Coveted Fifth Gear
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- Joined: 22 Sep 2003
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
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
- bob_rich
- Fourth Gear
- Posts: 564
- Joined: 06 Aug 2009
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!
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!
Phil Harrison
1972 Elan Sprint 0260K
1972 Elan Sprint 0260K
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pharriso - Coveted Fifth Gear
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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.
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.
Stu
1969 Plus 2 Federal LHD
1969 Plus 2 Federal LHD
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stugilmour - Coveted Fifth Gear
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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!
I used their Tech support & even being 3200 miles away it was great!
Phil Harrison
1972 Elan Sprint 0260K
1972 Elan Sprint 0260K
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pharriso - Coveted Fifth Gear
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- Joined: 15 Sep 2010
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