When does a T3/T4 60 trim work?, is it normal that it is at 4K revs? Options

[Conwa]

I recently installed a T3/T4 60 trim turbo on my 7afe, but is it normal that it start boosting at 4K revs?
I have a B16 manifold and a 2,5 inch downpipe.
It spools up @ about 3,5K but kicks in at 4K and stops at 6200 when it hits the rev limiter (of course)
Its running @ 0.45 Bar (7psi ?)

[dans_st]

not to try and steal the thread, but I am going to be runnig a ceramic moated GT32 in a 60A/R @ around 12-14PSI, and possibly a 35-shot of spray, do you think that this is also a proper sized turbo?

I was told that the GT series would spool around 500rpm sooner than the T3/T4 style and get me more output, is this true?

I was told here before that this turbo was pretty much useless on my car but I am fine with a 4K spool up, and going by the calculations in the book I though tit should have been fine.