So im still trying to get my v3 working. I'm on a 420a Neon motor with the newest version of the msns-e code (q2). The v3 MS was working when I was using the VR input for the crank signal. BUT it would backfire and reset the MS under boost. So I switched to the Hall/Opto setup by following the instructions on the MSNS-e web site and now I'm getting Tach spikes. At idle they are not bad, it's mostly under load. The car will cutout and the MS will reset, please see the attached log file. My v2.2 board MS works flawlessly, So i'm pretty sure it's the MS v3 that is the issue. I've also see a few posts on 2gnt.com about this problem, but no mention of a solution. Please help! I've got to make it to the DSM shootout in 2 weeks and I took today and monday off work to try to get it running. Thanks!
Well, I'm running low imp injectors and that's why I wanted to upgrade to the v3 board with the built in flyback circuit. I am using PWM on the v2.2 board and it's fine. If I need to use high imp injectors i guess it defeats the purpose.
I was curious about the PWM settings on the v3, I got it down to about 48% now on the v3 whereas the v2.2 was at about 70%
I was getting tach spikes/resets too. To solve this I removed the XG1/XG2 jumper, ran a wire from XG1 to pin6 (Tach shield) and then grounded the shield at the distributor. This mod gives a seporate ground input for the opto isolator. After this mod ALL resets were gone.
MS1 V3.0 MSnS-e029q2
Ah cool, thanks for the relpy. How would I implement this on the MS v3 board with the neon crank decoder mods? My XG2-XG1 jumper is already removed. Based on the wireing diagram at http://megasquirt.sourceforge.net/extra/setup-neon.html I'm not really sure what to do.
Not sure how to implement in your situation. As your crank trigger is supplying this ground. Is your crank trigger wires (2) shielded? If not, use shield and ground at the same point as MS main ground. In your case I would try the "Dave Cap" and see if this helps. If not try to reverse the polarity of the crank trigger, some poles on magnets are screwy. Route your trigger wires away from the coil and ignition boxes. If your trigger wires are a twisted pair, you can try to twist them the other direction. In rare cases, twisted pairs can cause a reverse emf with a pulsating DC traveling on the wire.
