I Plan on using a t25 turbo to boost my b16 civic.

How do you think this turbo will respond to this motor?
about 7psi.

what rpm can i expect most power?

 

I found 327 threads by searching in the forced induction archives. This may help:

https://honda-tech.com/zerothread?id=1660631

 

A T25 is very small for a B-series. It will spool very fast but will definately limit power on a motor that flows as much as that one does.

I don't know Hondas well enough to tell you exactly when you'll see full boost or peak torque, but peak power will be lower than it should be because of the excessive restriction. 7psi is reasonable and the compressor can probably handle that, but it's the extremely smaller turbine that will be hurting you.

Any particular reason you want to go with a T25?