While I am trying to track the Cobb, Nasioc and IWSTI Forums on these topics, I figured I'd share what I am learning with my SECCS brethren.
If we are lucky, maybe Mike, Paul or Ed will chime in when I say things that are really stupid.
Please note that if you tune your own car, it is your fault if something breaks. Nothing anybody writes in this thread or tells you about should you blindly do to your car. Your Subaru ECU will do it's best to protect you, but you can destroy your engine or worse tuning your car. Proceed at your own risk.
There are other options, ECUTEK, and OpenECU /
Enginuity
I think OpenECU is a great thing, some great stuff for just the cost of an OBD2 cable, though the real time maps of AP/ST would make it my choice even today.
Probably the most important thing I have learned so far is.... LOG!!! Even if you only get professionally tuned, IMHO you should LOG!
Oh, and if you can't use a spreadsheet, stop reading, get a professional tune and be happy.
If you plan on doing you own tuning, you need a notebook, boost gauge, wideband O2 sensor and an EGT sensor. Don't even think about it without all of those.
My current setup is Cobb AccessPort V1 + Street Tuner + ProTune, LC-1 Wideband O2 sensor with gauge and Autometer EGT and Boost gauges.
Threads of note:
Street Tuner n00b Tuning Primer Oldie but good place to start.
Engine Management Is The Smartest Bang for The Buck on The STi More of a review, but some interesting info in the later pages.
All Sticky threads on Cobb ST page.
EFI 101 basic EFI primer.
Let's talk AVCS tuning.....anyone...?Everything there is to know about AVCS except what is still in Clark's head.
Tuning Timing With Street Tuner - By a Noob for a Noob
Engine Management FAQ: Read if you are thinking of buying one!Unibomber's summary of all such things.
Feel free to contribute others.
More to come...