Reply With Quotenow thats more like it, I agree with you there.
Now back to my second question, would it be any issue having two parallel solid state relays to send the ECU's single output to either one of two ignitors?
Re: current draw of a twin outlet coil.
on the exhaust side, it is easier for spark to jump, and the spark lasts for longer, so it has lower current density/amps per unit time... ie skinny spark but lasts a while
i guess that helps build up a sort of capacitance for the compression side, and the spark is shorter in time, but fatter (ie more amps per unit time)...
so the total current move is same, bu tthe power side has fatter spark....
edit: but this is all a moot point, the current draw of the coil is simply to do with the resistance/impedance of the main coil while it is charging up... nothing else
"I'm a Teaspoon, not a mechanic"
"There is hardly anything in the world that a man can not make a little worse and sell a little cheaper" - John Ruskin (1819 - 1900)
AU$TRALIA... come and stay and PAY and PAY!!! The moral high horse of the world!
Re: current draw of a twin outlet coil.
now thats more like it, I agree with you there.
Now back to my second question, would it be any issue having two parallel solid state relays to send the ECU's single output to either one of two ignitors?
Re: current draw of a twin outlet coil.
Why would you use SSRs and not IGBT's?
Cheers
Wilbo
Re: current draw of a twin outlet coil.
whats an IGBT?
Re: current draw of a twin outlet coil.
Insulated Gate Bipolar Transistor....Originally Posted by Sam_Q
http://en.wikipedia.org/wiki/Insulat...lar_transistor
They are what are used in most ECU for the coil / ignition driving circuits....
Maybe I'm a bit confused... what is it you are trying to achieve exactly? Are you trying to turn wasted spark into sequential spark, or something else or?
Edit: And you've also mentioned igniters... usually inside the igniter is an IGBT... if you have igniters then you could more than likely just parallel your low level signal to them directly...?
Cheers
Wilbo
Re: current draw of a twin outlet coil.
i remember a type of coil ( cant remember if it was points(high rsistance primary winding) or electronic, drawing about 4 amps..
modern electronic coils have a lot less resistance i would have a guess at around 10 amps or less each coil.. would be plenty
are you testing different types of ignitors ?
Re: current draw of a twin outlet coil.
erk well I am trying to stay away from electronics for now with my bad track record but I am considering it.
good guess wilbo but I am trying to make one signal into two so dizzy to waste spark with an external connection.
Yes I thinking that I could directly intercept the signal to the igniters instead of after, more trouble in some regards but less unknowns
Re: using a solid state relay on a twin outlet coil.
you would need a top dead centre number 1 cyl reference for that.. and then you would need to program an ic to suit this and use mutiple igntion transisters.. would get quite complicated..
and remember typical charge time for these types of coil would be around 2ms you would need something to controll that aswell
Owner built, tuned and driven. 420kw 9000rpm 3sGTE AE86 Levin
Re: using a solid state relay on a twin outlet coil.
if you're using the factory ECU then stick with the current setup.
If you're keen on changing to waste-spark, talk to someone about an aftermarket ECU (Adaptronic, Megasquirt, Haltech, Microtech, autronic, etc. Trying to build some electronics to do coil-switching is going to be frustrating.
Re: using a solid state relay on a twin outlet coil.
well I have a sneaky way of getting a signal on when to fire which I prefer not to share, I wish I could but I don't want it copied before I atleast get a chance to try it, sorry guys.
S14series2: the way it would work is that the twin coils would receive the exact same charge time as the stock single coil, that's ok then right?
thechuckster: I wish I could stick with the stock setup but this is for the people I cant educate on how bad the stock ecu is on a 20v engine or just dont want to spend the cash for something that's actually worthwhile. This is all about removing the dizzy cap for clearance in RWD.
Re: using a solid state relay on a twin outlet coil.
Interesting!
Is your idea limited to only 2 channels or do you think it could be expanded to 3 channels? Are there additional trigger inputs required?
I'll be watching very closely, hopefully you idea pans out and you will be nice enough to share or maybe point in the right direction
"Don't worry what people think, they don't do it very often."
Daily: Glorified Taxi (F6 Typhoon). Out Of Action: Twin-charged Adub. Ongoing Nightmare: Over re-engineered (not) Alfa Romeo 75.
Re: using a solid state relay on a twin outlet coil.
not limited to any amount of channels and it's quite a simple concept. An additional input is required.
Re: using a solid state relay on a twin outlet coil.
so this is like the box Kellam made many years ago or?
"I'm a Teaspoon, not a mechanic"
"There is hardly anything in the world that a man can not make a little worse and sell a little cheaper" - John Ruskin (1819 - 1900)
AU$TRALIA... come and stay and PAY and PAY!!! The moral high horse of the world!
Re: using a solid state relay on a twin outlet coil.
nah thats some fancy box that uses the factory crank angle sensor, mines way more crude (and cheap! hehehe) than that. Now corollas or any else can they tell me how the signal coming back from the igniter looks to the ECU? is it a pulse?
Re: using a solid state relay on a twin outlet coil.
It is a pulse but going by http://www.users.on.net/~jezza323/IG...Gf_circuit.pdf it is a different shaped pulse than the igniter trigger pulse.
"Don't worry what people think, they don't do it very often."
Daily: Glorified Taxi (F6 Typhoon). Out Of Action: Twin-charged Adub. Ongoing Nightmare: Over re-engineered (not) Alfa Romeo 75.
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