so ive lost about 2 lbs of boost...any idea what caused this... thw car runs fine but a bit weaker does our bypass valve get sticky....my iats get really high but i did some runs withlow iats and it would stay 14.8 until 7100 rpms it would jump to 15.8, before it would be 16.50 to 18 psi

 

do you have any cats

 

same thing happen to me, im running ott stage 1 and i got their heat exchanger and dual pass with opt b, i thought it was just the warm weather lowering boost bc i used to get 17/18 and now i only get to 15. sucks car feels weaker thought that was just me getting used to it. Would also like to know like wtpcobaltss whats the cause or if it normal
yes i have stock dp w/ cat of course

 

I had the same problem. I went from 19psi to 15psi. I felt a huge difference. Im on a 2.7 pulley and i had the stage two belt. I eventually found out that my belt was slipping so i ordered the larger idler pulley. It bumped my boost back up to about 17 or 18psi. sometimes i do feel like the bypass valve is sticking somewhat. or it feels like it fluttersback and forth in second gear at about 50% throttle. Any one else notice this? maybe thats where my other pound of boost went.

 

the belt appears fine...but also wouldnt u hear some noise if the belt was loose?

screw it s20g here i come, im getting fed up with high ass iat2's and all the problems that come along with this damn supercharger...pump failures bypass valve fluttering, i rode in a 08 tc and with just a tune and he got his car brand new for a 1000 less then i paid for mine used...im mad. his car laid me in the seat and had no traction till 3rd

not to mention the interior is much more comfy and race inspired

 

I'm right there with ya. I doubt I could be any more fed up with these cars than I am now.

 

I lost boost when I took the cat out but that's because I was getting more air through, so get rid of the cat.