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Lots of misinformation and idiots in here.
there are 3 4age 16V variants (4agze aside). Early bigports have smaller rods, smaller journals, and smaller wrist pins on the pistons. Late bigport have slightly larger rods, larger journals, and larger wrist pins, but have the same compression ratio. Smallport have the largest n/a rods, same size journals and wrist pins and the late bigport.
4agze's have an added oil squirter setup, as do the smallport n/a 4age's. US 4agze's have the same sized rods as smallport 4age's, but have lower compression, forged, ceramic top coated pistons.
The wiring of a standalone is easy -- messing with a stock harness of a car this old is pretty simple, everything is straightforward.
You can bolt SC12 pieces onto an n/a bigport 4age, it's been done time and again. Keep in mind that with higher compression and cast pistons the engine will be less reliable and if pinging starts you're pretty much done. That being said, it can be done for a relatively inexpensive cost if you watch ebay, since full SC12 setups go for $300-400 including harnesses, manifolds, brackets, etc.
Finding a supercharged MR2 at a junkyard is like finding a ferarri at a junkyard. You're really lucky if you found it, you're even luckier if there's anything still in it. Around here, even N/A's get pretty stripped down in less than a week.
Megasquirt has been done.... I like to believe I was the first to run it on a 4agze that retained the supercharger (by no means on an n/a or a turbo 4age). Tuning isn't hard and you learn a lot.
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