OBD1 Engine swap - which computer?
 

1995 ti, going to be swapping in an i6. I have a bunch of parts, including an aluminium z3 2.8 block & crank and a complete M50. I was thinking I'd just use the 2.8 block and the rest of the M50, with the 325 ecu, but I realized I could use the 2.8 crank instead with the M50 head.

If I did the 2.8 block and crank, which OBD1 BMW ecu should I use? 325? M3? I'd like this beastie to be theoretically smog legal when I get done...

413.

Ah, ok, answering my own question here - 413's the E36 BMW 325i/is/ic through 9/92 to 12/94, for M50tu/B25.

I assume the 2.8 will need more air and fuel compared to what the 2.5 it's expecting to hook up to would, but again, guessing here I'll need some kind of custom chip to compensate...or at least get the most out of the engine, correct?