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RPM Input
Posted: Wed Feb 06, 2019 12:17 am
by MikeStang
Can you use the MSD box output as the RPM input into the MK3 Pro? (Using FREQ1)
Noob question, I searched expecting to find the answer, but did not.
Posted: Wed Feb 06, 2019 12:40 am
by brentp
Hi - what kind of signal does the MSD box output? Is it a clean square wave? If so, you should be able to connect it directly to the RPM input.
If it's a flyback signal from the coil, you may need CoilX:
http://wiki.autosportlabs.com/CoilX
Let us know and we can guide you in the right direction. Thanks!
Posted: Thu Feb 07, 2019 3:23 pm
by MikeStang
Not 100% sure of the signal, it got stupid cold here so I have not got a chance to scope that signal. Was just curious if anyone knew. I will scope it and report back, thanks.
Posted: Thu Feb 07, 2019 7:15 pm
by PS14
Most all the MSD box's like a 6AL produce a 12volt square wave signal with a 20% duty cycle for a tach signal. simple answer is, yes.
Posted: Mon Feb 18, 2019 2:25 am
by MikeStang
Yup, for sure 12v square waveform.
Posted: Mon Feb 18, 2019 10:20 pm
by brentp
If it is a clean 12v square wave, then you should be good to go without CoilX.
Posted: Wed Feb 20, 2019 4:38 pm
by MikeStang
brentp wrote:If it is a clean 12v square wave, then you should be good to go without CoilX.
Yup, clean square wave. Took a pic of my scope with my phone, was gonna post, but screen glare makes it hard to see.