Okayyyyyyy in the midst of planning my engine re-wire, on the to do list is make the variable plane intake manifold work.
uses a small DC motor to turn 6 butterflys in the intake manifold from long to short runners. The DC motor pulls about 1.5A of current and then slowly falls.
Anyway, First hitch was making the DC motor switch polarity (to open and close) based on an RPM output. That was done with 2 changeover relays and the RPM based output on the ECU.
Now the last problem, which we thought we could control with a time-delay relay but cant, is getting the DC motor to stop drawing current (i.e. cut off supply) once in its open or closed position. Reason we cant use a time delay relay is it instructed me not to keep dropping the earth in order to reset the relay, which is how I planned it....
So, here's the basic dual changeover relay setup to make the motor go one way, and then another way.
My question is, (Must be a cheap option here out of a job now lol) after the motor at say 3000RPM has closed the longer runners off, HOW do i have the motor NOT drawing any current, UNTIL it gets a signal again to re-open...
Just imagine the 12v is actually 5v...
(when I tested current draw that was at 12v so probably less at 5v)
