@Enki turned me on to Matchbot:
http://www.turbos.bwauto.com/aftermarket/matchbot.aspx
It takes a little while to learn how to use it, but there are YT vids on doing so and it is extremely helpful in letting you know what to anticipate with a particular BW turbo on your car.
You'll get output like this:
http://www.turbos.borgwarner.com/go/0GEM4A
The key is to input all of your car's variables and fine-tune the boost curve, etc., to see roundabout what to expect. It'll help you make sure you stay on the turbo's efficiency islands too, neither surging, nor choking.
[doublepost=1482305040][/doublepost]For instance, I'm not sure if I used the right compressor Phi curve, and I spitballed boost levels you may run; I also didn't enter your exact particulars, but you'll be well on the compressor islands @ 650/490 if you ran 35psi up top:
http://www.turbos.borgwarner.com/go/XJ7D79
Just have to not WOT too low to avoid surge...