I'm Need Some Help Guys (last time I try this.)

OK this will be the third time I have made a thread and not gotten a good answer some I'm gonna try one more time.

This is a picture of my boost gauge at WOT:



Anyone know what could be causing this. MAP sensor?

Here some info though:
When I bought the car, the supercharger was not connected. There was an idler pulley that was shredded and the S/C belt was just sitting there, for God knows how long... So when we put the belt back on it felt slow still, and over time (after the PCM put some more timing in) it got a little faster, but still doesn't quite feel as strong as my old black GTP. (I could be wrong though)

Any help would be appreciated guys.

I'd check for leaks, then replace the MAP. Maybe the S/C belt is slipping too? Check the air intake areas. What FWI tube are you using? I've heard of weak ones collapsing under load.

How tight is the belt?

The belt is brand new and the tension is tight. Forgot to add that in there.

I would bet that there is a vacuum leak somewhere. Have you checked all of the connections? Not sure about the map sensor, but i have an extra one. Shoot me a PM if your interested. I have to look and see if i still have it

Have you scanned it? Compare those to some stock numbers (bin).