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josrph berki wrote:
Ernest,
I have been studying the various Megasquirt documentaion on the web. Did you use a BAC valve and a TPS? If not how did you alter the code? Is that something in the tuner software that is on a menu? I guess TPS could be implemented by connecting throttle linkage to a variable resistor in a voltage divider. we would not need the BAC valve. Thanks for any help
BAC valve is for idle control, if I remember correctly. Just set "Idle Control Algorithm" to none and you're done. MS spends a lot of its resources to achieve smooth running at idle, cold starting, cold running, hard accelerations and combinations of all of those. Getting a smooth engine across all those combinations is actually MUCH more difficult than what we have to deal with.
I used the stem of a potentiometer as the pivot point in my throttle. One of the very first things you do after getting the MS installed is to set the TPS with the tuner software. It pops up a dialog, asking for the ADC values at 0% and 100% throttle. Set the throttle to off, click on "Get Current" and the tuning software will pull the throttle setting from the MS. Set the throttle to full and click "Get Current" to set the other end of the scale.
BTW, you don't need a voltage divider. The potentiometer IS the voltage divider. MS provides a 5V reference that connects to one end of the pot, and a ground to the other end. The sense wire goes to the center point.
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