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DYNA S electronic tacho wiring

Agemax

Agemax

Forum Guru
Anybody know what electronic gadgetry i need to make an electronic tach signal generator from a Dyna S / Dyna coil set up on a GS1000?
Dyna sell a cable for the job but i am sure it is just a few resistors or diodes or sommat like that, which could probably be made for a fraction of the price that Dyna are selling the cable for.
TIA
 
The signal conditioning is going to be dependent on what you are driving (i.e. what TACHO). What are the signal requirements?
Someone has probably done it already; I know there was a thread here in the last month for a VaporTrail.
 
its for a shift light, make unknown. originally intended for a car as the diagram included just says to take the signal from the - wire to the coil.
 
spoke to Dynatek UK and they say their cable adaptor will power any electronic tacho or shif light that uses a low voltage signal. They wont tell me what the secret parts involved are, so i guess i will just have to purchase one.........
 
JonnyC said:
Check out this thread - http://www.thegsresources.com/_forum/showthread.php?240184-Trail-Tech-Vapor-Tach-Problems

I ended having to connect the tach lead for the Trail Tech to both negative terminals on the coils through diodes as no matter what I tried I would always get feedback from the other coil signal when connecting to just one. This requires changing the tach setting since you'll get 2 pulses per revolution.

Have you tried connecting the shift light yet?
Click to expand...

Can you draw a schematic? I could never figure out what you actually did. Include the partnumber.
 
JonnyC said:
Check out this thread - http://www.thegsresources.com/_forum/showthread.php?240184-Trail-Tech-Vapor-Tach-Problems

I ended having to connect the tach lead for the Trail Tech to both negative terminals on the coils through diodes as no matter what I tried I would always get feedback from the other coil signal when connecting to just one. This requires changing the tach setting since you'll get 2 pulses per revolution.

Have you tried connecting the shift light yet?
Click to expand...
No i haven't tried yet as i will wait until i get the cable adapter from Dynatek. basically that is all the cable is, 2 wires connected to the neg side of the coils with diodes inline to stop the pulses from triggering both coils at the same time. if i knew what diodes to fit then it would be easy to make the cable myself....
 
posplayr said:
Can you draw a schematic? I could never figure out what you actually did. Include the partnumber.
Click to expand...

Code: 
[FONT='inherit']                                      1N4005
                               ---------|<---------- Primary Coil (-) Terminal
                              |
Trail Tech Tach Input Wire ---|
                              |
[/FONT][FONT='inherit']                               ---------|<---------- Primary Coil (-) Terminal
                                      1N4005[/FONT]
 
Thanks..........

So a single diode on only one coil did not work? Bike did not run or the Tach bounced?
 
Tach bounced. I got a smaller voltage spike (sub 12v) on the lead when the other coil fired, but not always, and a single diode or resistor couldn't fix that issue. Was exploring a filtering mechanism to only send a voltage signal on the tach lead when voltage was higher than maybe 20v or so (flyback voltage from coil), but experimenting with series zener diodes had me confused, and this approach was simpler and reliable.
 
Agemax said:
so that is all i need, 2 of those 1N4005 diodes and i can make the cable myself?
Click to expand...

I believe so, yes. And really I think a 1N4002 through 1N4007 would work, I just went with the 1N4005 since it was the same price and can handle higher voltages.

Are there settings for the shift light to account for different pulses per revolution? Or is it something where you just press a button when you're at the RPM you want it to trigger at?
 
JonnyC said:
I believe so, yes. And really I think a 1N4002 through 1N4007 would work, I just went with the 1N4005 since it was the same price and can handle higher voltages.

Are there settings for the shift light to account for different pulses per revolution? Or is it something where you just press a button when you're at the RPM you want it to trigger at?
Click to expand...
It is adjustable between 1k and 11k, has jumpers on it to change it from a 4,6 or 8 cyl engine. I will have to experiment with those jumpers when it is fitted.
 
Agemax said:
It is adjustable between 1k and 11k, has jumpers on it to change it from a 4,6 or 8 cyl engine. I will have to experiment with those jumpers when it is fitted.
Click to expand...

Okay perfect, it seems setting it to 4 cylinder should work fine then as that should equal 2 PPR assuming the shift light was built for an automotive distributor system with a single coil.
 
JonnyC said:
Okay perfect, it seems setting it to 4 cylinder should work fine then as that should equal 2 PPR assuming the shift light was built for an automotive distributor system with a single coil.
Click to expand...
Hopefully, just ordered the diodes, 99p for 10 delivered, much better than ?25 for the cable from Dynatek!!!
Will post up results when i get it all connected up. Thanks for the help JonnyC.
Maybe someone should add this mod to Basscliff's website, would be very helpful info for someone in the future.
 
A word of caution while this appears to work on the trail tech, it might not work if the tach is expecting a 0-5 or 0-12v signal.

The trail tech is an AC signal input that those diodes can create but would probsbly be in compatiable with the DC signals mentioned.

Yea I know the dytech used diodes but there are various was to use them depending upon the type of input.

you are going to apply 12v to the tach input so as long as it can handle that there will be no damage so give it a try.
 
Last edited:
All connected up and tested, works as it should. only tested it by statically revving the engine but light appears to come on when the tacho roughly coincides with the dial on the shift light. will test better when i next take it for a ride.
The tacho signal cable works fine with the diodes, started as normal and no sign of misfire or ignition issues.
 
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