Microsquirt V3 Running Dynatech Ignition

[jeeping68]

I have seen a lot of info on running a Dynatech ignition on a motorcycle using Microsquirt, but I am still not totally clear on the setup, so I am hoping I can get some clarification. If the answers are posted on another topic link, let me know and I will gladly go there. I am installing a Microsquirt V3 on my Honda CB750 running a Dynatech ignition. I want to let the Microsquirt run the ignition as well as the fuel, but I know I can't run the coils directly from the Microsquirt. My plan is to read the Hall sensor with the Microsquirt and then have Microsquirt pass the signal to the Dynatech unit. I am running 2 coils in a wasted spark configuration currently. There are two hall sensors. I know how to connect the sensors to the Microsquirt. My question is, how do I wire the Microsquirt signal out to the Dynatech unit. Has anyone set up something like this? Will my idea work, or should I just run fuel only and let Dynatech handle the spark? If I go fuel only, how do I get a signal from the Dynatech unit to the Microsquirt so it knows the RPMs? Thanks for any help. This forum has always proven to be a wealth of great info.

[wombat258]

Are you using Dyna S or Dyna 2000. I run fuel only and let the Dyna 2000 programmable look after spark. The Dyna 2000 has a tach wire that inputs into the microsquirt. With the Dyna S you would have to condition a tach signal from the coils as per the guide. The microsquirt cannot run the Dyna coils directly without a driver unit. I have toyed with the idea of using the Dyna 2000 to drive the coils using a signal from the microsquirt using toothed wheels, but cannot see any real advantage, even with a turbcharged engine. The programmable Dyna 2000 units are reliable and are easy to setup.

[jeeping68]

Thanks Wombat258. I am running the Dynatech 2000 and the more thought I gave it, the more I am was leaning towards running just fuel only with the microsquirt. I had thought about switching to some GM coils to run from the Microsquirt, but then I have to figure out where to mount them at. Looking like the Dynatech is the best solution.

[jeeping68]

Wombat 258, one follow-up question. My Dyna 2000 has a Green tach wire that outputs 1 pulse per revolution and a yellow wire that outputs 2 pulses per revolution. I am assuming that I will be connecting the yellow wire to the microsquirt since the microsquirt is interested in each time the engine fires so it knows to inject fuel. Is this correct?

[wombat258]

Yes, use yellow tach wire. Ignition settings - Rising edge, Trigger rise, Trigger wheel teeth = 0. That should cover it.

[nakedninja900]

which input do you wire the Dyna tach output into?