VEMS Community Forum

VEMS => Modifications and Repairs => Topic started by: Slow_Audi on September 08, 2020, 05:48:09 pm

Title: Tachometer Output - Divider Question
Post by: Slow_Audi 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.

Title: Re: Tachometer Output - Divider Question
Post by: Kamuto on September 11, 2020, 12:51:08 am

no, your trigger have no relation with tacho pulses, only cylinder number does

Title: Re: Tachometer Output - Divider Question
Post by: Slow_Audi 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?

Title: Re: Tachometer Output - Divider Question
Post by: jrussell 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.