Author Topic: Tachometer Output - Divider Question  (Read 2217 times)

Offline Slow_Audi

  • Jr. Member
  • **
  • Posts: 2
  • BHP: 0
Tachometer Output - Divider Question
« on: September 08, 2020, 05:48:09 pm »
What should the tachometer divider be for a 36-1 crank wheel? Having trouble understanding the tachometer divider. I'm sure I could dial it in with my scope and guesswork but it would be preferable to understand the theory. Thanks in advance.

Offline Kamuto

  • Hero Member
  • *****
  • Posts: 814
  • BHP: 19
Re: Tachometer Output - Divider Question
« Reply #1 on: September 11, 2020, 12:51:08 am »
no, your trigger have no relation with tacho pulses, only cylinder number does
Vems installer in Lithuania
[email protected]

Offline Slow_Audi

  • Jr. Member
  • **
  • Posts: 2
  • BHP: 0
Re: Tachometer Output - Divider Question
« Reply #2 on: September 17, 2020, 10:56:27 pm »
Thanks, I've been trying to 'backwards engineer' numbers but nothing makes sense. What do these numbers mean in the divider area? Are they call out for a script or are they the actual integer involved in the math?

Offline jrussell

  • VEMS USA
  • Administrator
  • Full Member
  • *****
  • Posts: 221
  • BHP: 15
    • VEMS USA
Re: Tachometer Output - Divider Question
« Reply #3 on: December 04, 2020, 07:36:43 pm »
A divider of 16 is 1:1 mapping. 1 pulse per revolution. That allows adjustment up or down if you need to do something weird such as use a 8cyl tach on a 4cyl engine, etc.
VEMS USA - Located in beautiful Burlington, Vermont
1988 RX7 Turbo