NA 1.6L Anyone re-flashing the stock ECU?
 

I've tried searching, and it doesn't appear that anyone is doing it, except BEGI with the much later cars.

Is my search-fu weak? or is this accurate?

I've just picked up my first miata, a bit of a beater, but its going to be a track car (road course, not drag strip) so I'm in the planning stages for a budget build-up for 200-250 rwhp.

One of the biggest killers in the budget in my particular case (and many others) will be the piggyback/standalone ECU mods to control everything properly. I also prefer to avoid piggyback items that trick the ECU (think things like S-AFC, O2 Clamp, rising rate FPR), I know they work (some better than others), but I still view them as bandaids and would prefer to skip them if I can. That moves me to standalone, which there are clearly many excellent options out there, but even the cheapest will blow my budget as it sits right now.

As you can tell, I'm sure you guys are going to tell me no, it hasn't been done, and I'm crazy for not just sucking it up and buying a standalone.
I'm in a unique situation though, because I've got a good friend that has cracked a number of different OEM ECU's to allow recalibration, and he is willing to take a look at an ECU for me, and help me sort it all out.

I guess what I'm looking for here is knowledge on what has been done, and if anyone has a '90 1.6L ECU they want to donate to the cause it would be tremendously helpful.

There's a gigantic thread on miata.net search there for 'socketing', some people on there have hacked the stock ecu and managed to change the fuel and timing tables. It's quite crude though and not FI compatable as the AFM/MAF doesn't have the resolution and there's no on-board MAP sensor!

Yeah, I found the thread over there about an hour after I posted this, and my friend and I have been going through it all, and its becoming more obvious why it hasn't been done before. While entirely possible, it's looking to be a pain to do, and its not terribly suitable.

Fwiw, the on-board MAP sensor isn't an absolute necessity as long as you have an good MAF signal and the vol eff calcs don't fall apart over 100%. You can calculate load very effectivaly that way and have no need for the MAP. I know Audi does it that way in several of thier boosted applications.
It's a moot point anyway though, because like you said, there isn't much resolution to the AFM/MAF signal.

Dang it, now I've got to refigure the budget, lol.
Though, my friend suggested one of the Subaru Denso ECU's might be fairly cheap and easy to adapt. If anything comes of it, I'll let you guys know.

Realistically the easiest to adapt would be a dsm ecu since the timing whees are the same. Next would be to adapt a Honda dizzy and run chrome. By the time you do either you can build a megasquirt. If the $140 or however much the ms1v2.2 is will break your budget then I'm not sure what to tell you

Only if you want to weld on the Subaru crank and cam sensors...