Engines run best at 14.7:1 - whether it is under boost or not.
In the past, lower AF ratios under boost used excessive fuel as a detonation control - the additional fuel acts in the same way that water spray does - it cools the incoming charge.
It's a band-aid fix, in my opinion, to run excessively rich. Detonation control starts with the engines cooling system - to the way it was built - cam specs - etc etc etc.
Gonna have to get back to a meth/water spray here again (me = broken record). It will work for you.
Guy is on my Jeep forum. He makes a lot of sense and has been very successful with his turbo projects. I know hes injecting a 7:1 ratio of meth/water to his fuel at WOT under boost also.
So I was wondering, do you guys agree with him? I see most guys get tunes for around 12.5:1 at wot.