02-10-2012, 07:56 PM
Join Date: Jul 2009
Total Cats: 0
MS Assembly Help
Halfway through the steps, so far so good! I want to ensure there is no guessing on my part as I build this. I may have more questions along the way (I promise I'm searching as I go along, it's how I've gotten this far already!
What kind of tach signal does the miata use? What should I be doing with step 50?
50. Next you need to make a decision. There are two input circuits for the tach signal:
The Hall/optical/etc. circuit takes the square wave input from a Hall sensor, optical sensor, or points. It can also be used for triggering off the coil (but only if you are not controlling ignition timing).
The VR circuit takes the AC signal from a variable reluctor sensor and converts it to a square wave for use by MegaSquirt.