Ignition (output, ignadv and dwell) page for MembersPage/EricN
Note that trigger is on MembersPage/EricN/Trigger
Even-fire 6-cyl
LS1 ignition transformers
This is what I know so far: 4 wires
- 12v
- ground
- ground to the ecu
- trigger wire
Since there is only 1 "trigger wire", I assume this can only work with distributor. Maybe a 6-cyl wasted-spark coilpack off of a Ford or Chrysler or whatever worths considering (drawback is that it might prevent factory look).
I have done some various measurements on a running vehicle. Trigger is by a 4 Volt signal (I didn't check the trigger time but the scale was set to 1 second and it was just a vertical blip) that does not change at all with RPM. I suspect it is extremely low amp, logic level signal.
How to output a logic-level ignition signal
Use the same driver as the original IGBT is driven from, just solder a jumper wire in place of the IGBT (don't solder IGBT for given channels), between the gate and drain the 2 pins closest to the EC36 connector, and use ign_out=70 in your config /Emil
We usually use ignition channel 2 and 5 for these (recent tradition, that assembled ECMs are setup with ign channel 2 and 5 this way unless ECM goes for V8 with COP: very handy when IgnitionPage/TransformerWithAmplifier is to be used), for 6-cyl with ignition module with logic level input you need a 3d logiclevel channel.
MembersPage/MarcellGal/EngineSwap also uses similar logic-level ign setup for IgnitionPage/TransformerWithAmplifier
Dwell - for LS1 ignition transformers
I have measured dwell:
- dwell length is around 59 degrees at all engine speeds and loads.
- Duty cycle was at about 95%, stayed constant.
Please correct the above, obviously there must be some misunderstanding as 59 degrees is not equal to 95%*120 crankdegrees.
- Pulse width changed dramatically but if I understand it correctly: if either of the above (59 degrees or constant 95%) is true, that is natural consequence of engine speed ( pulse period decreasing as RPM increases)