Anyone have a table of rpm vs voltage for the tach wire. Pin #13, red connector on PCM?

 

are you sure it's voltage and not a pulsing signal?

I don't know for sure, but thats how i always thought they worked.

 

Nope, not sure. lol. I have heard the pulse thing before too, but i have also heard voltage.

If it is a pulse, how is that measured vs rpm?

Thanks guys

 

ttt cause i want an answer too now

 

8 pulses per revolution? common i know someone knows

 

^^^

 

well, if it is just using the coil signal then it should only be four pulses per revolution. four stroke motor, 1 stroke up and 1 down is 1 revolutioin, therefore each cylinder fires every 2 rev and so 8cyl* 1pulse/2rev= 4 pulses/rev.

Still just the two of us in here, haha.

SOMEBODY .....
SOMEBODY ......
SOMEBODY ....
SOMEBODY ......


Please .....
Please ......
Please ....
Please ......

Confirm this!

 

Assuming you get the answer to your question, what are you going to do with the the info?

 

lol....thats for me to know and you to find out rob!

jk... I have a buddy that is an EE, we were going to try to put together a very cheap shiftlight from some parts he had lying around, but we need to figure out the output of that wire first...

I know about harlan before everyone says that, but i am BEYOND burned out on him. long story im not going into

 

I will do nothing but put it away with other useless trivia information I just wanted altjar to get his answer really. Thanks for joining the party in this empty thread shoebox, hahaha.

 

Here's an idea. Put an Oscilloscope on that wire and see what it does.