Haha fine what's the flow rate and efficiency on a 3sgte
Wernt we talking about turbo's a second ago ? now its the engine....i cant keep up mate
But to answer your question vaigly, it all depends on the work done to the cylinder head, as this is thought to be the "final restriction" after all the cheaper mods are done.
Pretty much when u get down to the nitty gritty on a stock head and cams the CT26 will flow low 20's for PSI but when u reach just over 4000rpm the size of the turbine A/R becomes the restriction and your boost levels fall very rapidly, in roughly 500RPM you can drop 6-10psi depending on your exhaust mods.
Its simple physics, too much stuff is going into a small hole, eventuly the flow will reach its limit and this is when your boost curve will run flat, unable to climb even if u paid it.
The turbo should compliemnt the cylinder head, so if u have a stock cylinder head no point buying a turbo that is mammoth balls like a garret GT45.
Dont worry about numbers and horse power and shit like that, just think logically and keep it simple when it comes to modding the ride.