Good result - looks like a good drag setup, plenty of top end flow in the turbine, a stage 3 .63 is high flowing so which new compressor are you thinking of changing to? - something more modern than the T04b series but sizing wise?
I'll probably stick with the T04b and try a 60-1 compressor wheel which is massive in terms of flow. With a decent boost controller where I can set boost against rpm I want to drop the torque down to around 370lbft ( to save the gearbox and clutch from a battering) but hold it for another 500 rpm and try to keep it revving. Thats the plan, i'm not sure how its going to work in practice. I'm probably already at the limits of what the turbine and head is going to flow but theres no harm in trying.
