Rep Power: 0

after I reconnected a wire under my hood that seemed to have accidentally come undone I was driving around and when I reached 6000 rpm (when I usually feel the power drop off, I felt an enormous Surge in power and I accelerated alarmingly fast, this now happens every time my rpm reaches that level, I like it but.... what the hell is going on?why does it kick in at such a kick RPM? is this adjustable