[delanta1992]

Ok so have a 2012 civic Si. Installed cte supercharger with the 3.15 pulley .. when I dynoed it had 310-3 hp ... i was getting knocks so Installed a I'm 2.25 after cooler kit. When i went to tune it again at the same place it had 260hp at6psi I replaced the drivebelt tensioner I still have same issue .. has anyone else had this issue or know how to fix?

 

[dpetro1]

What size belt are you using? Is the cte tensioner adjusted properly? Sounds like either belt slip or some type of air leak.
Check all your vac lines and the bypass valve.

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[Hyudryu]

Ok so have a 2012 civic Si. Installed cte supercharger with the 3.15 pulley .. when I dynoed it had 310-3 hp ... i was getting knocks so Installed a I'm 2.25 after cooler kit. When i went to tune it again at the same place it had 260hp at6psi I replaced the drivebelt tensioner I still have same issue .. has anyone else had this issue or know how to fix?

Tighten the belt.

This is how your boost should look, constantly rising till redline. Mine started at 3psi and ended at around 12psi.