ColbyMP

Thank you. That’s the one I figured he was referring to. I will surely check that out.

What is the reference line? Is that a port on the bpv or is it a hose? Which port or hose is it? Thanks

Agreed! Just wish the issue was solved. Gotta hunt around for a boost leak.

Yep, doing research I found that a boost leak is a high probability. I’ll check it out. Thanks for the info on how you did yours.

I will check all that out. Thanks!

About a week ago, I posted on this forum about a flutter whistle sound that my 2010 LGT (159k miles, some unknown tune, and some mods) was making between certain speeds. I got a lot of possibilities. So I did some more research and found that a bad TMIC to TB hose sound is what my car sounds like. I checked and sure enough, the hose was bad. I ordered an AVO TB hose, installed it, and the sound is STILL HERE...UGH! At this point, still not sure what the issue is. Maybe a bad BPV? Boost leak? I tried my best to capture a sound clip of it so attached is the clip. Not sure if you will be able to hear it or not. It is the whistle flutter sound right before shifting: http:// https://streamable.com/un7zax Please help. Thanks. The following link is a different person’s video of their 2011 WRX doing the same thing. Mine sounds just like this: https://streamable.com/3wkt7 Decided to post a new thread because I think my original thread got sent to the bottom of the forum.

So I did some more research and found that a bad TMIC to TB hose sound is what my car sounds like. I checked and sure enough, the hose was bad. I ordered an AVO TB hose, installed it, and the sound is STILL HERE UGH At this point, still not sure what the issue is. I tried my best to capture a sound clip of it so attached is the clip. Not sure if you will be able to hear it or not. It is the whistle flutter sound right before shifting: http:// https://streamable.com/un7zax Please help. Thanks. The following link is a different person’s video of their 2011 WRX doing the same thing. Mine sounds just like this: https://streamable.com/3wkt7

Thank you for the info. All great stuff to look into. Wish I had a boost gauge. It doesn’t do it between shifts.

It occurs before boost. I’m not giving it much more than half throttle. No noise when idling under the hood.

Thanks a lot, I’ll look into it.

I am unaware of what tune my car has. I was just told by the dealership that the previous owner tuned the computers. I think the timing belt is due for a change so I’ll look into that and the air box. Thanks.

Unfortunately, the previous owner has the stock exhaust. I am unaware of it having an aftermarket recirc valve but I’ll check it out. I’ve had the car for 4 months now and yesterday was the first I’ve ever heard this sound. Is it possible the valve just got tired over time and finally gave up? Or would it have been doing it the whole time if it was due to my exhaust and overboost? Thanks again!

Thank you for your detailed response and help. It’s great to know people care about each other and their cars on here. As far as getting an audio, it is a pretty quiet noise compared to my loud Invidia cat-back and Invidia Catless DP. I tried getting audio but the sound is inaudible. I will try a few more times. I will certainly try the methods you prescribed and see if it is the recirc valve. Would it just be worth it to instead replace the whole turbo since it has so many miles on it? Would a new recirc valve come with a new turbo? Thanks!

It is a pretty quiet noise compared to my loud Invidia cat-back and Invidia Catless DP. I tried getting audio but the sound is inaudible.

Okay, I am the third owner of a 2010 LGT with 159,000 miles. As far as I know, it has some tune to the computers but virtually all stock mechanics. Today, I noticed a brand new noise that resembles a turbo flutter. It occurs at specifics speeds in each gear when I rev higher than needed before shifting (around 2,500 RPMs). I hear it best in 4th from 40-45 mph, 5th from 50-55 mph, and 6th from 60-65 mph. It occurs both when accelerating (harder than normal; doesn’t do it when slowly accelerating) and coasting while the engine is breaking. It only occurs at those speeds and goes away beyond them. For example, I am in 4th accelerating around 35 mph and hear the typical, consistent turbo whistle. Then, I reach 40 mph and hear a flutter-like whistle or squeal until 45 mph, then it goes away. Then I let off the throttle and at 45 mph, I hear it again until 40 mph, but it is a fainter sound than when accelerating. It sounds like either the turbo or maybe a belt. Could it be a wastegate actuator? Or just a sign of an old turbo? (I think it’s the original turbo). I have no smoke coming from the exhaust and there is no obvious loss in power. I don’t have a boost gauge so I’m not sure what psi the turbo is producing. Please help diagnose the issue. I’ll post updates if I resolve it. Thanks!