Anyone tried firing leading and trailing plugs at the same time, PFC or other ECU?

[royal]

Thanks ...

[Prof]

Yes mate, I have an Apexi PFC and commander. I want to really learn how it all works and really like the idea of a DIY system like the VEMS or Megasquirt rather than a solution in a box so to speak. Just me in tinker mode I suppose. If I\'m going to map the PFC myself I need to buy a wideband and datalogit and for a similar price I can buy the full VEMs system which includes a wideband anyway. The only problem is there doesn\'t seem to be many people who\'ve done it with the VEMS. There\'s a guy with a 3 rotor turbo called bcool on rx7club who I\'m trying to get in touch with. I\'m pretty sure he\'s just using leading plug, but don\'t know how far he\'s got to getting it running.
 
If I could just confirm if doing leading only is ok then alls well but until then I can\'t make a decision and will have to use what I have. The VEMs guys were talking about adding in a split spark feature but I don\'t know how long that would take.

Does the VEMS allow you to add ignition channels, or have more than 1 map and select the channels in that map ?
 
I was just thinking that maybe you could set up 1 channel for leading, and 2 for trailing. That way you could set the split up by putting the timing you need in one map, then some offset values to get the split in the other map. Since you don\'t have the switch over circuit that the stock ECU has to toggle the trailing ignition firing, you will need 3 channels at a guess. (The trailing plugs are fired by a timing signal, and also a select signal which alternately fires one rotor or the other). That\'s not needed on the leading ignition, as you can use wasted spark.

[royal]

I\'m not sure prof. I don\'t think you can do it as you say, as someone over there would have suggested that I\'d have thought? From what I can see there\'s only one channel and you can\'t offset it. I\'ll bring it up as I\'m sure it\'ll help me to understand the software better. They are talking of adding a proper trailing spark feature though, just depends how quick that could happen for me.