i need an rpm signal from one of my coil packs.. hmmm which color? red / black / purple? anyone know??

thanks

 

i need this info i dont want to run to my ecu i just want to tap the coil packs closest to the mevi i'm installing right nowwww.. hmmm help porfavor?

 

What RPM switch are you using? Do you have an FSM? Do you know what FSM means? Do you know the meaning of hertz and its relation to frequency?

 

hah sweet, i'll figure it out, thanks

 

I wasn’t trying to be a buttocks. The thing is, where you obtain RPM signal depends on the RPM switch. Some require the use of the ECU wire. Some do not (Harlan). The Harlan you can use the coil wire.

The FSM will tell you which wire to tap via ECU, as well as which wire is the main signal wire re: coil pack wires which will give you the reading you want.

Frequency is a speed input/output (i.e. RPM revs PER minute) so, if you read the manual you will see that x hertz = x RPM, roughly. Turn that into an equation, and you have a nice reference and linear equation. Plug in some #'s and you have a relation. You’ll need some type of hardware &/or software to read it this way.

If you have an RPM switch, it does it for you (the conversion) and makes it sound more human like, and not geek like.

 

What he said ^^^ actually, every coil pack has +12 volts battery, a ground, and a trigger signal on a wire - and that wire's color is different for each coil. Cylinder #1's color is not the same as cylinder #6. The tachometer output from the ECU has a pulse for each coil being fired. An individual coil fires by itself, and sees only 1/6 of the pulses shown by the Tach output from the ECU.

I know that a MSD 8969 RPM switch can be programmed to work from different numbers of cylinders. I use a 8969 connected to one coil trigger wire to control my MEVI, and another 8969 connected to the Tach output to shift my automatic.

? hope this helps ???