At sea level you should be making more than 7.6 on a 4.5" pulley at 9k. I'm at 8psi and I'm 300+ meters above sea level.

 

You should be making about 14 psi I believe. I make about 12.5 on a 4" pulley on my AP1 with the same kit. You have belt slip or boost leak.

As for hp depends on dyno but high 300's to low 400's.

 

I'll check for slipping belt,
how to check for boost leak ?
where exactly i should be looking at ?

 

Sure, you can loose boost if its not closing for some reason. It should be open/venting at idle and hit the throttle and you should hear it close. Put your hand in front of it to help verify when its blowing.

And check all your clamps and couplers for leaks.

 

https://www.s2ki.com/s2000/topic/874...#entry20690838

You can make or buy a boost leak detector. If in doubt, check it out.

 

How tight do you have the belt? What type of pulley do you have?

 

pulley bought from vortech direct
it's 3.8"

 

I got a vortech v3 with a 3.8" pulley from vortech and im making peak 10psi of boost

 

8k redline though right? 3.8" at 9k should be around 14 psi.

 

is your motor built? you should be seeing from 12-14. usually stock motor sees 14.

my motor is built and i see 12.