I am putting together a spreadsheet so I am prepared to terminate the flying lead harness. I was curious if I can get away with 6 IGN1A coils on one 25A HCO. This is an NA build so I dont think it will need a ton of power for the coils?
I am hoping to use
HCO 1 - Injectors
HCO 2 - ign coils
HCO 3 - fuel pump
HCO 4 - brushless fan(if not, then leave this open or split the ign coils across both.

 

Plug in your proposed duty cycle and dwell time to find your practical current requirements, for example:

For an 8000 RPM target and 5ms dwell:

Rev/sec = RPM / 60 = 8000 / 60 = 133.3
sec/cycle = 1 / cycle/sec = 1 /133.3 = .0075 = 7.5MS
Coil dwell/charge time = 5ms
Duty cycle @ 8000 RPM = On time /Total Time = 4 / 7.5 = .66

Now that you know the duty cycle and you know that coils aren't a constant draw - so you chop it in half - and reach peak saturation at 7.5MS (weird coincidence) you can plug in the rest:

True current consumption per coil at 66% duty = .5(7.5) * .66 = 2.475
True current consumption on a single circuit = 2.475 * 6 = 14.85A

 

yes no problem at all, we run 8 off them all the time, have made over 4000hp with no problems

 

Awesome thanks guys!

 

So, quick revival of this one, im doing this too. Made some comments in red on this ign1a manual from haltech. Is this the correct way to wire it?
And, since it draws about 15 amps(see calculations above from dguy), running 4 coils off 1 HPO is no problem?

Also, to make a ignition harness quick disconnect, i should be able to use deutche DT connector yes, since they are rated for 13 amp per contact.

 

Could you share your excel file. I'm curios on how you went about your setup.

 

All correct.