I should definitely have pointed out that I knew it should be replaced with a 1g *turbo with manual transmission* when asking my question, but figured that was pretty straightforward anyway. Thanks Paul!

Actually, if you've got some kind of fuel control, the injector size issue (due to different trannies) can be compensated for as well. It would just be an inconvenience if you lost all your settings and had to start from the base (which would be out).

Expert input needed! JDM ECU has arrived. Part number MD165808. Apparently it's from a 91/92 GVR4 (more info available here). I have no idea if I can just swap this with my non-eprom ECU and have it work, though if it's anything like a standard 1g turbo ECU from 91+ DSM, I know I might have to swap two wires for the tach to display and possibly purchase a pulse inverter.

Someone please tell me this will work... FWIW, the board looks the same as the photo on the DSMLink website (my only EPROM ECU reference material right now), but that doesn't necessarily mean it will function the same as a 1G DSM EPROM ECU...

http://otsmotorsport.com/dsmchips/viewtopic.php?t=121&sid=ed6613b2d3ef71fe0519ef38d1eb8cee

You might have to register to view it. There are a few differences. I'm sure Jeff O can help you out if you need more info.

Quoted from that thread:

Thats what I always assumed, but I was wrong. That board looks like it has an opamp on it that amplifies whatever sensor is connected to pin #15. On a US car, that would be an EGR temp probe, but I don't think thats what it is on JDM cars, because we don't need that extra amp.
However, back to your original question, YES, you need to remove the board if you want to make it 100% compatable with a US car. You also need to:
1) install jumper J101
2) remove jumper J102
3) install jumper J103
4) install jumper J104
5) install jumper J105
6) install 10K resistor R141
7) install USDM EPROM

The Cyclone on the 808 ECU is controlled by pin #53, the EGR solenoid on US cars. I just tested it this morning on my own car, and the Cyclone doesn't open until ~4600 rpm! I've been setting my US chips for 4093 rpm, which seems about perfect.

Thanks Reza. From reading that small chunk you pasted from the site, this looks like a lot more than I can handle. I'm no electrician... Should I even bother doing this or just get a standard 1g turbo DSM EPROM ECU? So very discouraging...

It will work. Removing/installing the jumpers, and adding a resistor isn't much work for someone who knows what there are doing.

I don't know if anything has even been done to that ECU or if has been socketed yet.
Maybe you should message Jeff O, or even Steve Kinnaird to see if they can get it going for you with a chip of your choice.

This ECU has not yet been socketed. I registered with that site which you linked and have yet to receive confirmation in order to log in and determine how difficult this process actually is. Jumpers are not bad, but adding resistors and soldering circuitboards is not something I've tried before...

Don't really want to mess up this ECU if it can be made to work. I'm sure they'll have a schematic or two I can bring to a local electronics specialist and get the mods done for a decent price.

Thanks again Reza!