That's nice to know that a MAF system adapts so
well to the increased flow.
10-12 PSI might be a bit too much for the stock
CR pistons, you might have to use LC forged at
about 7:1 CR to get the most from the turbo at
higher boost pressures.
There comes a point at which no matter how much
fuel you supply the engine will ping, stock CR of
8.9:1 at 10 PSI will ping, but you have to remember
boost and flow are two different things, higher boost
will not give more power by it's self, you need more flow
to get there too.
The IHI turbo you have is probably good for 9 PSI, much
more than that and it will just start running out of flow.
I pulled the waste gate line off to see how much more
I could get, not any more boost and ping city, I was really
disappointed with the result.
What size engine did your turbo come from
I matched the turbo from a 1.6L Mazda MX3 for
my swap/install, I didn't want to loose low end
from too big a unit.
Wild