I have GM Stage 2 installed I noticed for most of the winter I have been reading almost 120 kPa most of the time and have hit 120 sometimes (which is about 17.4 psi), it also went down to -20 C here somedays but even on warmer days it still would read about the same. From what I read on here thats too much for a GM Stage 2 pulley. Cloged exhaust maybe? Also today it was about 2 C and it was reading about 110 kPa (about 15.9 psi). Im also thinking my I/C pump might not be working now would that make a difference?

 

what exhaust set up do you have? sounds like a clogged cat

and no, a non-functioning IC pump will not raise boost levels

 

Sounds like its the cold air if you're showing around normal on warmer days..

 

Just stock , it should warm up a bit here soon so I will know then. What should i be running normally .. about 15 psi? I was only hitting about 15.9 psi tonight and its still pretty cold here so it might be nothing.

 

Yeah, I'm pretty sure GMS2 is 15psi

 

Alright thanks, I also noticed lately it doesn't seem to pull as hard. Im thinking maybe the I/C pump but im not sure. Also seems to be a ticking noise coming from under the hood, sometimes its worse then others. Maybe timing chain?