Is this an MSPNP, or a DIY MS setup for PNP use on your Miata? If it's an MSPNP shoot us an email and link to this thread, include all of the information on the label on the bottom of the unit, we can tell from that if it's got that large cap on the 12v input already, which willl help make the units pretty reset resistant unless you've got major ground/12v issues or something else funky going on with your harness maybe. Shoot it over to websales@diyautotune.com

Matt and Jerry:

Thanks for helping out. I'm going to have Andy send you guys the version number in an email, its a PNP from you guys. At this point I'm seriously doubting its something directly with the megasquirt unit. We cleaned the ECU grounds and drove around all day yesterday in the shitty rain. Early in the day had 3 resets in pretty quick succession, then drove another 5+ hours total without a single one. Still on the list is to add another ground from the ECU ground to chassis and see if that helps things a bit.

I'm also happy to report with the factory loaded timing and fuel maps we've already started to tune for boost, and its been a piece of cake. I was really worried about how well it would work out since I've only tuned two N/A cars on megasquirt thus far. What you guys provided for the base maps with minor adjustments has been an excellent place to start for 8psi supercharger. :D

MSPNP MM9495 v1.01 rev C

Email has been sent.

That's currently the latest revision and should be fairly reset resistant. It's got a large cap on the 12v feed to smooth out the rather noisy 12v power available to the ECU which in most cases helps even if your grounds are weak. We'll still be glad to take a look at the ECU if you do suspect it at some point. Is it possible you have any damaged wiring, or noisy ignition modifications placing coils/plug wires along EMS wiring?

At any rate, glad to hear the base map was a good start for your tuning, that was the goal!

No damaged wiring as far as I know had a few cut wires from before but all is solid now, Just installed another heavy duty ground from the ecu grounding point to chassis, about to go drive some more and see if anything happens. Will probably install a 2nd heavy duty ground at another point later today. Thanks for all the support and replies guys!

Andy

I have another observation that has me scratching my head:

http://jugrnot.com/slippingbelt.jpg

Very bottom graph, the dark red... are those HUGE voltage fluctuations normal? I actually never checked voltage in logs from my miata...

That's pretty big. While MLV zooms in and that can make some signals look noiser than they should be, your battery voltage signal is pretty noisy. I think there's a charging issue here.

Well, I took my lovely 217K mile alternator in today to get tested, well it passed on Oreilly's machine, a few buddies work there so we hooked up a multimeter and ran the tests again to get specific numbers, well it's putting out 14.9 volts and jumps to 15.3 volts and it puts out a whopping 12 amps.

How about the voltage regulator - how well is it working?

Not sure how to test the voltage regulator in the alternator, but new alternator comes in tomorrow.

Tossed in brand new alternator unit. Changed nothing.

At this point, we've started adding grounds. The number thus far is around 10 new grounds in various places on the car. So far today since we stopped working on it, we haven't seen a reset yet. Will post back soon if that changes.

Guys I want to thank all of you for responding and helping me out with this issue. After adding a ton of grounds anywhere and everywhere the problem seems to have stopped the last two days the car has run AWESOME! If anything changes i will update. Thanks again.

Andy