DaveEFI wrote: ↑Fri Oct 23, 2020 3:57 pm
From what I've read, the Nodiz come with 4 ignitors to allow plain wasted spark coils. And decent coil drivers are actually quite expensive in electronic component terms - at least to buy in relatively small quantities. If you go to active coils - either wasted spark ones, or individual ones, that makes the Nodiz more expensive than needed.
On my SD1, I mounted the 4 EDIS coils on a bracket made for the job from IIRC Trigger Wheels. Fitted it to the alternator bracket. Of course there is some lead crossover, but I've not had a problem with that in the ten years or so I've been running EDIS. Nor have I had a problem with the EDIS module. mounted where the original single coil was on the SD1.
Leads crossing over isn't a problem persay. Same way a dizzy with HT leads flying everywhere isn't a problem. Compared to modern stuff, it just looks crap and is untidy when it is so simple to make it neater.
Keep it simple.
Coils with built in ignitors, coil near plug so short HT leads and whatever control/ecu option you want. Just setup in wasted spark as you have no cam trigger.
Modern coils are all cheap, plentiful either new or used and pretty much all very powerful.
I wouldn't bother with regular inductive coils. In general they are not as powerful, but these days they are just less common, so would be fewer options if you are wanting new parts. There's nothing wrong with them of course though.
And although you might say ignition drivers are not cheap in electronic terms.....in real terms they are still dirt cheap. Surely still only £2, 3, 4, maybe at most £5 each for a high current option ?
In order to drive a IGBT style coil with a regular inductive driver setup, the trigger needs to be inverted. Not all controllers can do this.
ie.
Inductive will ground the trigger coil input to charge it ( coil has a permanent 12v supply ), and often either totally remove the ground to fire ( points ), or in electronic terms, apply 12v to the trigger input ( no potential difference, same thing, coil fires )
IGBT or modern internal ignitor coils will usually apply a voltage to tell the coil to charge, ( 5-12v usually ) and as per above but opposite so to speak, 0v at the trigger then fires the coil.
So dwell from one to the other are opposites.
a 10% dwell duty on Inductive applied to IGBT would be 90% and burn things out in no time.
So to repeat....Maxxecu Mini, LS coils...simple, neat, tidy, no long or messy HT leads
But with whatever coils you choose, you will need to find out what is a suitable dwell time for them