So this evening I'm driving home from the in law's and I noticed the turbo spool was 5x louder than it normally is (no lie). As I started giving it gas, I could hear the spool very clearly around 2k-2.5k RPM's. My 09 WRX is 100% stock so hearing the turbo spool and the BPV make any noise is very rare. So I started giving it a little bit more gas in 2nd and 3rd gear and the spool was really loud all the way up to about 3k - 3.5k RPM's. Once I got past 3.25k - 3.5k RPM's, the turbo stopped spooling (completely) and then started back up again around 3.75k to 4k RPM's. I did this a hand full of times and probably once or twice it made a very unusual fluttering sound. It almost sounded like a hose was loose and the greater the force, the hose was like completely getting blown off. I immediately backed off once I heard this. I pulled over, checked the BPV to see if anything was loose. Couldn't find anything. Got home and checked again in the garage and still couldn't find anything.
Is something wrong w/ my BPV? Turbo?
I will admit, on my way up to my in laws, I was behind a Astin Martin Vanquish and we got into it a few times (wow, that thing can fly). However, I didn't do anything that I haven't done before...just got her into the 5k-6k RPM range.
I'm going to try and get it into the shop Wednesday and have it looked at. Does anybody have any idea what the heck happened?