#58054, "RE: how many volts is the rpm signal wire?" In response to Reply # 0
The actual tach signal is measured in mV. Use a multimeter on the tach wire.. solid white, no stripe, maybe brown/pink/tannish dots... it might go as far as 5V at 7000+ RPM, but i couldn't tell you..
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'95 Eclipse TurboGS (garage deco) '95 TSi AWD (restoring a survivor) '97 Talon ESi-T (poor impulse control) '99 Eclipse RS-T (daily beater) '13 Evo X (mostly stock) '17 Sienna (Middle Aged Dad Mobile)
#58062, "RE: how many volts is the rpm signal wire?" In response to Reply # 2
Quote yeah.. it should go up in volts dependignn on high the rpm
Of course it does. I just don't remember the scale of it. I remmeber it was reading in millivolts, but scale that to 7,000RPm, i don't know. If you have a stutterbox, i imagine it would be pretty easy to find out
______________________________ If a sentence found online has 35% misspellings or greater and includes at least two racially charged expletives, chances are it is a YouTube comment.
'95 Eclipse TurboGS (garage deco) '95 TSi AWD (restoring a survivor) '97 Talon ESi-T (poor impulse control) '99 Eclipse RS-T (daily beater) '13 Evo X (mostly stock) '17 Sienna (Middle Aged Dad Mobile)
#58096, "RE: how many volts is the rpm signal wire?" In response to Reply # 3
Last I checked the tach wire was not a linear 0-5V signal (like the TPS or MAP). It was a pulse type signal that could not be properly read by a volt-meter. The signal switches from low to high at a certain frequency. I believe that the frequency increases as you increase the RPM. I believe that you would need an oscilloscope to properly read the tach signal.
Corbin
'95 ESI-T HRC+FMIC+ETC...
Gimme fuel...Gimme fire...Gimme that which I desire
#58115, "RE: how many volts is the rpm signal wire?" In response to Reply # 4
^^^ Correct. The signal isn't linear and almost every manufacturer uses a different method to trigger the tach. My WBo2 logs the rpm signal and lots of people have to change a resistor (I think) to get it to work. That is in addition to the hi/lo jumper setting that's available.
Greg
'19 Genesis G70 3.3t AWD '88 Chrysler Conquest TSI
#58125, "RE: how many volts is the rpm signal wire?" In response to Reply # 5
Quote ^^^ Correct. The signal isn't linear and almost every manufacturer uses a different method to trigger the tach. My WBo2 logs the rpm signal and lots of people have to change a resistor (I think) to get it to work. That is in addition to the hi/lo jumper setting that's available.
thats the same software / hardware i want to use. im going to build the unit this weekend. did you have to put a resistor in or did you just hook it up and it worked?
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