| Author | Message | ||
     The4ork |
im installing a Veypor gauge, and i cant seem to get a good rpm signal. i tried taking it directly off the coil, but it interferes with the signal to the coil and kills the ignition, works when cranking but makes it so i have no spark. so then i tried it off the signal to the gauge (orange wire) and it doesnt work, also tried the pink wire, but does the same thing as getting the signal off the coil am i going to need a diode so the signal can only go one way or something? ive never had this much of a hassle trying to get a tach signal from an engine lol | ||
| Ratbuell |
The gauge feed *should* work. When you say "doesn't work"...define? Works, but out of whack? Or not at all? Does the Veypor have a switch on it somewhere for 2, 4, 6, or 8 cylinder use? I know when I was dragracing musclecars, all the Autometer stuff (tachs, shift lights, etc) had those switches so it could 'interpret' X number of pulses divided by Y cylinders equaled Z rpm. And, when I switched my old FLHP over to single fire ignition (new coil, new pickup, new box), there was a specific tach output wire to feed the gauge. Should be the same idea - but backwards, obviously - on this setup. (Message edited by ratbuell on July 08, 2010) | ||
| The4ork |
i was told the pink wire in the tach gauge feeds rpm signal. if i hook the wire up it (pink) and crank the motor over i read an rpm signal on the gauge. BUT the engine will not start. ive found that i have NO spark when the wire is hooked up to my veypor. if i disconnect the wire from the veypor it starts. if i leave it running and hook the wire up while running, it kills the engine immediately. so it works, but kills the engine. and yes it has a setup in the gauge to get the right numbers, but i havent gotten to that stage. right now i just need a signal while the engine still runs! do i need to add in a diode or a resistor inline or something? or do i need to feed off of a different wire? | ||
| Ratbuell |
Don't have my manual in the house...what are the wires that go to the tach? Also...is the Veypor an inductive pickup? Or something different? If it's not the same "type"...you could get the symptoms you're seeing (feedback loop). What do the veypor instructions say - can you loop around a plug wire for a signal? Does it have a specific hookup to the coil wires as a "just in case *this* happens" scenario? Depending on what kind of signal/input it wants...you may have to tap into the lead that feeds RPM to the ECM. If you can, post a link to a set of the instructions... | ||
| Oldog |
the pink wire on a carbed bike is the coil pulse, you appear to be grounding the signal out, can you post up info on the veypor electrical, you need to reduce the input load to the curcuit, or as Joe indicates you need to do some thing else, I wonder if a resistor in line wit the gage will help reduce the current that the unit input is drawing from the tach circuit. just a guess here start at about 20K ohm in the line with the pink wire. | ||
| The4ork |
turns out there is two different rpm pickup wires for the veypor, and im using the wrong one :/ ill post back if the other wire works |
