Very nice project and great writeup!
How much weight was added? Does the bike handle any different? Any plans/is there room to add a small intercooler?
10.5 AFR at WOT is excessively rich, did the tuner try leaning it out some and see if it makes more power safely?
I told him I wanted 10.5:1. More fuel = safer. Keep in mind it's pushing about 8-9psi, more than I originally shot for so being on the richer side is not a bad idea.
The subaru community generally tuned to the 10.5 mark at peak torque, so this is what I went off, that is what my Subie was tuned to.
If you're firmiliar with NA engines, yes, 10.5 is excessively rich, but for turbo applications, that is a good safe place to be.
weight, it added around 20lbs at most, I would imagine. Cant say for sure as I didnt weight the componants. It is a bit more front heavy with weight added before center of the frame, and weight removed from behind center of the frame (header sections, muffler...)
It still handles very good, but you have to be careful with the throttle, it had a stuttery hesitation between 4-6k RPMS which can easily be avoided with driving pattern.
Yesterday I had to be careful coming into the onramp, i rode first gear light, then started to wail on second, the front end got squirly, backed off, added a little, squirly again, 'course the road wasnt perfect, but it does have alot of power to used to, I was over 110 by the end of the ramp and only stayed on it a little longer to 130. It doesn't even seem real to be going that fast, because of how quickly it gets there.
135 by the end of a quarter mile from dead stop with a poor poor start kinda shows the amount of power this thing makes.