3100/3400/3500 Engine management for Fiero

[Ravant]

Hey everyone. I've got an '85 Fiero 2m4 and am looking to do a 3500 swap.

A bit of background:
I originally had a '99 Monte LS that I swapped a 3400 into and turbo'd. That car was totaled. I managed to get a couple of parts back from it, sold some a while ago for cash to get me through not having a job for a month or two, but retained the ECU.

SO! Here's my question:
The PCM's Service number is 16236757, Hardware number 16200870. Will this run an early 3500 (non-VVT, non-DoD) or should I just sell it and get a 3500 PCM and call it a day?

[young gun]

If that ECU ran the LA1 it will run the LX9. Nothing big in changes just that the LX9 doesn't have a low oil sensor

[caffeine]

You need an external crank trigger for a 3500 as well. The 3500 PCM can't be tuned.

[robertisaar]

would likely need to use the earlier DIS setup as well.

[Ravant]

If that ECU ran the LA1 it will run the LX9. Nothing big in changes just that the LX9 doesn't have a low oil sensor

The lack of a low oil sensor won't tell the ECU to enter a limp mode or anything? Only swap I've ever done was an LA1 into a '99 Monte LS, so you'll have to bear with me on the newer stuff if my questions seem stupid, as I haven't been in the loop for... about 6 years now.

You need an external crank trigger for a 3500 as well. The 3500 PCM can't be tuned.

Does WOT-TECH still sell their 7x external crank trigger? And - when you say can't be tuned, do you mean not supported by HPTuners? Or do you mean the database section of onboard memory is read-only?

would likely need to use the earlier DIS setup as well.

Earlier as in...? Any part #'s or an idea of what donor cars I could yoink one from?

Lastly - and this is probably a pipe dream (ahhah. hah. hah. No pun intended.), completely useless and an all-round terrible idea, but it's an idea, and I've got to ask. Long story short, in the future, I'd like to do a twin-turbo setup with two smaller turbos on this swap.* My thought was, rather than going with one large ceramic cat after the turbo, I could add a pair of pre-cat O2 sensors right off the manifolds, then a pair of the higher-quality metal substrate cats right off of that. Then up to the turbos, down to a crossover pipe, out to a resonator and muffler, then out the back of the car. This leads me to my question:

Does the 6757 PCM allow for input from two precat O2 sensors? Or am I going to have to build a sum circuit that will take the input from the two sensors and convert them to a single output that the PCM can successfully read?

*(GT25's, 60-trim or thereabouts. I don't have specifics yet, because this is still in the vapor stages. I want to get the engine in and running bone-stock first, then I'll worry about mods and forced induction later. Exhaust needs designed /now/ though, because I can't use the donor's exhaust.)