MS3 and sdcard

[jsmcortina]

No, the inputs and outputs aren't the same.

James

[nibblet787]

No, the inputs and outputs aren't the same.

James

Ok, are these jumpers, that I mentioned I'm missing earlier, the ones you're referring to? I looked through the manual in it's current form, as well as the printed manual I used 6 years ago, and I simply can't see what other jumpers I'd need:

a) Solder a link between VRIN and TACHSELECT
b) Solder a wire between VrOUT and TSEL
c) IGBTIN to JS10 and IGBTOUT to IGN

My research agrees with what's posted here: https://www.diyautotune.com/support/tec ... tributors/
Where it says:
"Using the MegaSquirt-II PCBv3 or V3.57

These will also work for an MS3 without the MS3X.
If you’re assembling your MegaSquirt-II from a kit (Part# MS230-K):

For the most part, stick with the standard assembly documentation and well cover any departures from that doc here.
Step 51: You’ll be installing the VR input circuit (currently all steps under 51). You do not need the components in step 50, although it’s handy to install them in case you ever use the Megasquirt on a different car (or decide to convert your Mopar to a ignition system that uses this circuit).
Step 52: Set the jumpers for VR input. That would be TachSelect to VRIN, and TSEL to VROUT.
Step 65: You will use IGBT High Current Ignition Driver Circuit. That means you complete step 65. Install everything just as this step directs you to (which does mean no R57) and install the jumpers to enable the circuit. (IGBTIN to JS10 and IGBTOUT to IGN).
That’s it!"

[juansh2385]

Take pictures of your v3 board without the processor top and bottom of the board it will help identifying how it is assemble. This will help us configure you ms3 also and msq from ms2 can help to ID what you had before.

Sorry you explanation is not clear to say the least.

[jsmcortina]

a) Solder a link between VRIN and TACHSELECT
b) Solder a wire between VrOUT and TSEL
c) IGBTIN to JS10 and IGBTOUT to IGN

a,b are the input side
c is the output side

Your settings do not match your wiring in c.

You need to configure your spark output to use JS10 (so the settings match your wiring) and make sure nothing else is configured to use JS10. In the MSQ you posted it was being used by tachometer output which is incorrect, disable that.

James

[nibblet787]

a) Solder a link between VRIN and TACHSELECT
b) Solder a wire between VrOUT and TSEL
c) IGBTIN to JS10 and IGBTOUT to IGN

a,b are the input side
c is the output side

Your settings do not match your wiring in c.

You need to configure your spark output to use JS10 (so the settings match your wiring) and make sure nothing else is configured to use JS10. In the MSQ you posted it was being used by tachometer output which is incorrect, disable that.

James

I think I'm getting it now. Under the Tacho Output menu, I changed it so the output pin is also Tacho. Is that correct? I'll tackle the jumper soldering tomorrow. I'm attaching a couple pics of my board here, but they're low resolution due to the size limit for attachments. If higher res is needed, then I can supply my Google Photos link. Thanks for your patience, James.

[jsmcortina]

I think I'm getting it now. Under the Tacho Output menu, I changed it so the output pin is also Tacho.

You aren't using that, just turn it off.

James

[juansh2385]

ok the board is configured for vr input I do not see a pull up for the hall sensor.
ign out shoud be like james said js10 (If i remember correctly the bip373 sometime does not trigger the 6al correctly so i recommend changing your ign output configuration in the board).
turn of tach ou
you do not have anything installed to d14 so turn off the d14 led output

I modded the posted msq try it.

Also James does ms3 work with a trigger angle of 43? i remember that the range from 16 to 54 were not compatible or had limitation in the code.

[jsmcortina]

Also James does ms3 work with a trigger angle of 43? i remember that the range from 16 to 54 were not compatible or had limitation in the code.

Same deal.

James

[nibblet787]

Man, things just got a lot more stupid. It turns out that I did jump all those points. I just did it on the component side instead! I'm attaching a pic for illustrative purposes, but essentially I stripped a solid core wire (likely a leftover resistor leg) and inserted it into the adjacent holes. Much like how one would solder in a resistor, but just a bare wire instead. All points were confirmed connected with an ohm meter. I was so fixated on the lack of wires on the underside, that I didn't think to check on top.

ok the board is configured for vr input I do not see a pull up for the hall sensor.
ign out shoud be like james said js10 (If i remember correctly the bip373 sometime does not trigger the 6al correctly so i recommend changing your ign output configuration in the board).
turn of tach ou
you do not have anything installed to d14 so turn off the d14 led output

I modded the posted msq try it.

You're right there was never a setup for a Hall sensor. I was struggling to remember which I had done, back when I first mentioned this, but had since focused on the VR setup. I apologize for not more clearer on that point. The only thing I've seen about not triggering the MSD box correctly involved swapping out the bip373 for different component. But if there's an easier way to fix that, I'm all ears. Thanks for the msq, I'm about to go try it now.

Also James does ms3 work with a trigger angle of 43? i remember that the range from 16 to 54 were not compatible or had limitation in the code.

Same deal.

I'm not sure I understand what you mean. Same deal as in if my timing was controlled, the trigger angle would be fixed? In light of what I just posted above, what would your opinion now be regarding what juansh2385 asked about the trigger angle?

[juansh2385]

You trigger angle is 43 it will limit the amount of advance you can use. MS trigger angle should be between 0 to 15 or 55+ you should not use the range from 16 to 54. to solve this you need to re-phase you trigger source. (example instead of 43 trigger angle you should change it to 55 and rotate the distributor until your ignition advance timing measure with a strobe light match your command spark advance in megasquirt)

For the output test your setup first no point changing it if it works i was you pointing out that it could be an issue.
a posible solution is to configure your ign output to led in the ignition setting then using a jumper take you ign out from the negative side of the d14 led leg connect this directly to spare output pin

[nibblet787]

You trigger angle is 43 it will limit the amount of advance you can use. MS trigger angle should be between 0 to 15 or 55+ you should not use the range from 16 to 54. to solve this you need to re-phase you trigger source. (example instead of 43 trigger angle you should change it to 55 and rotate the distributor until your ignition advance timing measure with a strobe light match your command spark advance in megasquirt)

For the output test your setup first no point changing it if it works i was you pointing out that it could be an issue.
a posible solution is to configure your ign output to led in the ignition setting then using a jumper take you ign out from the negative side of the d14 led leg connect this directly to spare output pin

Awesome. I thought there would be a bit more to changing the trigger angle, but I did what you said and turned the distributor a little bit. Now, my trigger angle is 58 degrees. I loaded up your modded msq and that works perfectly, too! So thanks to everyone, I have an awesome running engine again! Now I just need to drive it around a lot and let autotune work its magic.