Originally Posted by spencerlinn
Ben, how on earth did you know that? I've been scouring the entire service manual library and have yet to come across anything that definitively says whether the programming in the two ECU's is different, let alone different triggers and other hardware. I've found plenty of references to the "ground a pin, now it's manual" trick on the internet, but none have been confirmed on the third gen, just second, and my service manuals don't mention a pin that serves that function. I do have a T30 with Subaru Select Monitor 3 and a TTL interface cable which supposedly will work for coding but not diagnostics. Do you suspect it's possible to change the "coding" on the ECU without changing the "programming"? I'm used to BMWs, which consider coding to be things like "am I a manual?", "What lights are DRLs?" and programming is the lower-level stuff like "what triggers do I use" and "what's my fuel map?", so I'm hoping there might be a way to code what we need into the ECU.
Well, I am a "Scooby Guru" afterall lol.
No, unfortunately I had to deal with this first hand when I turbo'd my car and was running an Autronic ECU. I was basically copying a friend who had a manual BE and we assumed they were the same. After 3 months of the car sitting because it would not run and having gone over my wiring to make sure it was correct multiple times someone suggested I change it to the "old" trigger configuration since I was using the manual BE trigger info. Switched one setting and it fired right up. You can see the differences if you look at the exploded engine view it should show two crank sprockets, or under the fuel injection section it will show the waveform of the crank and cam and has both I believe.
There is no grounding pin for the BE unfortunately so that will not work, or at least I am 99% sure it won't as I looked for it a while ago as well and it doesn't exist on the wiring diagrams. Your only real option may be open source tuning if anyone has done a BE and you can flash the different ROMs but your easiest and certain solution is to swap the trigger wheels and run the 5mt ECU.
Hope that helps.