MicroSquirt.com read only forum (Jan.15,2018)

I've made a little progress (I think). Now it will start up and run for about 30 seconds at most. It's not stable and I have to play the throttle a bit to keep it running. Then it quits without warning.

I ran a datalog on my last start attempt. Earlier today I downloaded the MegaLogViewer and I know I'm not "seeing" the meaning or clues in the datalog like some of you who have way more experience.

I'd really appreciate anyone who's willing to look at this datalog and .msq to give me any feedback or opinions they may have.

I may be wrong, but this datalog looks like a big mess. Right away I've noticed the RPM doesn't look good and I've wondered if I've got the "rising edge" or "falling edge" thing configured backwards. Could an engine even start if you had that part messed up?

Greg

Had a quick look before I go to work, your RPM is way out 46556 rpm!. You must have a settings issue, noise or your ignition "tapping" needs looking at.Plus when you zoom in the tachCount keeps resetting, goes to zero, and starts up again and your trigger± is not zero either (settings or noise).

First you need to get the RPMs closer to what your bike is reading on its tacho, and that'll probably take care of most of this. I will look at the msq later, but maybe somebody else will add their 2¢.

I have to admit I'm clueless about the whole ingition inputs part of MicroSquirt. I was just trying to fake my way through by doing what "seemed" right, but now it's obvious I've messed it up somewhere.

Here are the motorcycle's basic wiring diagrams for it's Ignition and it's Tach circuits.



Right now I've got the yellow wire (Y) from the Alternator (#12 in the diagram) wired to VRin+ (Ampseal pin 32) and the Black with Yellow (BK/Y) that comes out of the Igniter box (#14 in the diagram) wired to the coax casing of the VRin (Ampseal pin 33).

EWflyer wrote: Right now I've got the yellow wire (Y) from the Alternator (#12 in the diagram) wired to VRin+ (Ampseal pin 32) and the Black with Yellow (BK/Y) that comes out of the Igniter box (#14 in the diagram) wired to the coax casing of the VRin (Ampseal pin 33).

that's why your RPM is so high, you are wired to one of the alternator AC phases...

I have seen this on a French XT600 CDI ignitor box years ago, and I do not know anybody who has done this with a MicroSquirt, but technically it might be doable, if you knew how many ac spikes per crank rev exist. A ball park guess, might be look at your revcounter, then your datalog at 46K rpm and divide it, so that's your number of teeth. This is just a huge guess, and I'm sure others might add something more sensible, which would be use the negative side of the coil, and a resistor, Zener diode etc to protect the VR input.

I was in a hurry to make it to a dentist appointment when I posted my last message. I didn't mean to use the word "Alternator." What I meant to say was "Crankshaft Sensor." The association in my mind between the two items stems from the fact that they are two (very different) parts of the same mechanical assembly on the bike. Sorry.

Here I've uploaded a partial detail from the bike's overall wiring diagram.



On the left-hand side you can see the Alternator wiring, and on the right-hand you can see the wiring for the Crankshaft Sensor.

I was very careful during my wiring to avoid the three yellow wires coming out of the alternator. They were easy enough to identify because: #1-there were three of them, all yellow, and #2-they routed through the bike to a box marked "Regulator/Rectifier."

The wiring that comes from the Crankshaft Sensor is one yellow wire and one black wire, and they proceed through the bike to a box marked "IC Ignitor" and I chose the yellow one of the two as my VRIN1+ (Ampseal pin 32). I then wired the Silver Coax shielding (that routes to Ampseal pin 33) to the Black with Yellow (BK/Y) wire that comes out of the IC Ignitor.

So my question is: Do you see: #1-A mistake in this choice of wiring or, #2-If the wiring makes sense, do you think my problem has to do with my Base Ignition Settings in my .msq file from MegaTune?

Or.... I guess the third possibility (if my wiring is correct and MegaTune settings are right and it still isn't working) is that this bike's VR signal is just too noisy for the MicroSquirt. In that case I'd need to find another way of getting an ignition input to the MicroSquirt. Could I tap into the bike's #1Coil to Tachometer line? That should be a very clean, well defined signal.

I do remember reading a forum post where someone used a Tachometer line, and I think they wired it in through the OPTOIN. If this is an option you'd have to tell me exactly how to do it.

Hi again...never mind the confusion it made me laugh.
OK, so you are sharing the VR sensor with your ignition unit (ECU), but what does your crank wheel look like? (I can look at your previous posts and find out). It might be a problem sharing the VR sensor (crank) with your ignition, but unless you know what it senses, you can't use it.
The other option is your processed ignition side, so you use the revcounter (tachometer) or the coil negative, that is being switched on and off to give the MicroSquirt its' info.
Unfortunately, I cannot help any further, as I haven't done this, but there are people who have. Try a search for "fuel only" and see what comes up. The principle is the same, whatever the engine.

PS Try this http://www.microsquirt.com/viewtopic.php?f=38&t=22959

The other option is your processed ignition side, so you use the revcounter (tachometer) or the coil negative, that is being switched on and off to give the MicroSquirt its' info

This is exactly what I was hoping you'd say. Using the bike's Ingition Control output (to the Coil) sounds great because it's a "known" rather than the "witchcraft" going on at the VR sensor level.

I just don't know how to do it. I looked at the forum thread you linked to, but with all the opinions/results/ongoing problems in the vairous postings I can't get a clear and unequivocal picture of how to set it up.