Timing advance?

[JoeB]

I'm reading and learning, not a mechanic. I have a 99 Toyota Solara with a 3.0L V6 1MZ-FE. The ECU Toyota used is not rewritable. I use a Split Second FTC1 piggy back to control fuel/timing. I've been told there is no way to advance the timing, I can only retard timing. I've read here that one of the things I should do is to advance the timing with water injection. Any ideas? Thanks -JoeB