Author Topic: Dwell overlap?  (Read 5414 times)

Offline wazzu70

  • Jr. Member
  • **
  • Posts: 45
  • BHP: 1
Dwell overlap?
« on: October 22, 2013, 11:30:30 pm »
I am just curious if dwell is controlled as if its a distributor base or if dwell overlap is allowed on the individual circuits? I am just curious, my application would be fine either way :)
BMW E30 M42 project

Offline VEMS

  • Administrator
  • Sr. Member
  • *****
  • Posts: 487
  • BHP: 22
Re: Dwell overlap?
« Reply #1 on: October 23, 2013, 09:29:00 am »
Overlapping dwell is used, but only when ignition output selection allows it (no collisions allowed) and desired dwell requires it, example
  • simple trigger no cam sync, no overlap
  • multitooth wheel with or without camsync or simple trigger (with or without camsync), but only one output in use, no overlap
  • multitooth wheel with or without camsync or simple trigger + camsync, but only cyl_nr/2 output in use (and all different), overlap, but max 360_degree_time - minimum_off_time
  • multitooth wheel with camsync or simple trigger + camsync, but cyl_nr output in use (and all different), full overlap, but max 720_degree_time - minimum_off_time
Any dwell limiting either due to non allowed overlapping or minimum_off_time will be represented on dwell gauge in VemsTune for reference.

Regards, Dave
« Last Edit: October 23, 2013, 10:26:26 am by VEMS »

Offline wazzu70

  • Jr. Member
  • **
  • Posts: 45
  • BHP: 1
Re: Dwell overlap?
« Reply #2 on: October 23, 2013, 08:12:02 pm »
Thank you for the detailed answer. That helps a lot!
BMW E30 M42 project