1980's motorbike rev counter

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skelly
Posts: 39
Joined: Thu Nov 10, 2016 8:35 am
ECU Model: S40 Pro

1980's motorbike rev counter

Post by skelly »

Hi all.
I wonder if any of you can shed any light on how to make my S40 ecu work with a rev counter from the 1980's ?
Originally the rev counter took its signal from one of the coil negative wires but apparently the S40 only has a digital tacho output.
Thats all I know.. so far.
Any ideas or suggestions ?
Cheers.
Skel.
stevieturbo
Posts: 3577
Joined: Tue Aug 02, 2011 12:08 pm
ECU Model: No ECU
Location: Norn Iron

Re: 1980's motorbike rev counter

Post by stevieturbo »

You could take it from the coil negative.....

If that cannot work, more details of your install are required.
katana
Posts: 455
Joined: Sun Jan 27, 2013 6:08 pm
ECU Model: S60 Pro
Firmware Version: 29

Re: 1980's motorbike rev counter

Post by katana »

Try this - works on 70 / 80's era cars.....
Attachments
HiVTacho.JPG
Alex DTA
Posts: 1622
Joined: Fri Feb 28, 2014 1:03 pm
ECU Model: S40 Pro
Distributor: DTA
Firmware Version: 79

Re: 1980's motorbike rev counter

Post by Alex DTA »

Here's what I did many years ago on my Mk2 Golf:

http://clubgti.com/showthread.php?16615 ... ost1516418
skelly
Posts: 39
Joined: Thu Nov 10, 2016 8:35 am
ECU Model: S40 Pro

Re: 1980's motorbike rev counter

Post by skelly »

Cheers guys.
Slightly confused though.
On this diagram it takes a neg from both coils but on my bike it only took a neg from one of the coils to drive the revcounter.
If I do it as in the diagram will my revcounter read double due to twice as many pulses ?
EDIS_tach.gif
EDIS_tach.gif (5.63 KiB) Viewed 9365 times
katana
Posts: 455
Joined: Sun Jan 27, 2013 6:08 pm
ECU Model: S60 Pro
Firmware Version: 29

Re: 1980's motorbike rev counter

Post by katana »

It will if yours only needed a single coil feed originally. The Dyna2000 always gave the option of 1 pulse or twin to drive the varied tacho requirements.
skelly
Posts: 39
Joined: Thu Nov 10, 2016 8:35 am
ECU Model: S40 Pro

Re: 1980's motorbike rev counter

Post by skelly »

Cheers Katana (good name)
I'm using Dyna 2.2 ohm grey coils on my bike which should be compatible with the S40.
If I take one coil neg I wont need a diode... will I ?
Just tried to upload a photo of my bike but apparently my 'entity' is too large..
Skel
katana
Posts: 455
Joined: Sun Jan 27, 2013 6:08 pm
ECU Model: S60 Pro
Firmware Version: 29

Re: 1980's motorbike rev counter

Post by katana »

I think you may need the D3 Zener diode to stop reverse voltage spikes but i'm no guru!
The name......I had one GSX1000SZ as a drag bike a few moons ago.
skelly
Posts: 39
Joined: Thu Nov 10, 2016 8:35 am
ECU Model: S40 Pro

Re: 1980's motorbike rev counter

Post by skelly »

Well it looks like I dont have to bother with any of that stuff as it seems to work fine.
strange though as it doesn't work when I use the 'test circuits' function.
but it works and seems to read spot on..
Alex DTA
Posts: 1622
Joined: Fri Feb 28, 2014 1:03 pm
ECU Model: S40 Pro
Distributor: DTA
Firmware Version: 79

Re: 1980's motorbike rev counter

Post by Alex DTA »

The test circuits won't work the rev counter, it's for testing auxiliary components only.
Glad to see you're up and running.
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