Loud wooshing/sucking sound

I have a 2005 LGT. I removed the air silencer a while ago and you could hear a wooshing/sucking sound. It was not loud but you could hear it. Last weekend I started getting a VERY loud similar sound. I can hear it during accelleration above 3000rpm in all gears. There is no noticable loss in power, no check engine light and the car seems to run fine. I cannot hear it if I rev the engine in neutral. Does anybody know what the most likely source of the sound would be? How do I go about tracking it down if I can only hear it while driving around?

Put the silencer back on.

Judging by your symptoms, I would say you have a turbo in your car.

 

^+1 to above. Removing the silencer can cause some weird harmonics due to oscillations in the air pressure in the stock air box. I'd put it back on.

Roll your window up

I've had the silencer removed on my 05 since Aug of 2004. I think it sounds awesome...

 

OP You need to watch for signs of the turbo going. Unless a vacuum hose feel off somewhere, when you begin to hear a different sound, it could be the turbo going south.

 

Mine had the P0011 and P0021 codes, then the turbo began to whine, about a 1000 miles late the turbo began to whistle. I stop driving it and replaced the vf40 with a vf52 and had the banjo filter removed.

 

You may want to make sure the filter is removed now.

I've had the silencer removed on my 05 since Aug of 2004. I think it sounds awesome...

 

OP You need to watch for signs of the turbo going. Unless a vacuum hose feel off somewhere, when you begin to hear a different sound, it could be the turbo going south.

 

Mine had the P0011 and P0021 codes, then the turbo began to whine, about a 1000 miles late the turbo began to whistle. I stop driving it and replaced the vf40 with a vf52 and had the banjo filter removed.

 

You may want to make sure the filter is removed now.

 

Yes, anything that changes without you making any changes, means you should try to track down the cause. Similar to the advice i give to folks about gauges. They are relative. If your temp always reads 300 and all of a sudden it reads 315, you may have a problem. The delta is more important than the value displayed.

 

-mike

 

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I have a 2005 LGT. I removed the air silencer a while ago and you could hear a wooshing/sucking sound. It was not loud but you could hear it. Last weekend I started getting a VERY loud similar sound. I can hear it during accelleration above 3000rpm in all gears. There is no noticable loss in power, no check engine light and the car seems to run fine. I cannot hear it if I rev the engine in neutral. Does anybody know what the most likely source of the sound would be? How do I go about tracking it down if I can only hear it while driving around?

 

How do you NOT know you have a turbo on your car and this "problem" is your TURBO in action:mad:

 

Sorry as a 2.5i owner I so long for you "problem":rolleyes:

I cannot hear it if I rev the engine in neutral.

^ boost/load based. turbo related for sure id say.

 

IMO, put the silencer back on.

 

EDIT: and +1 to ditching the banjo filter if you havnt already... oh, and change your oil for good measure;)

the delta is more important than the value displayed.

+1

^ boost/load based. turbo related for sure id say.

 

IMO, put the silencer back on.

 

EDIT: and +1 to ditching the banjo filter if you havnt already... oh, and change your oil for good measure;)

 

 

May be get a can of engine flush from Subaru on run it through before the oil change. The stuff is like $20.00. I normally just use Gunk motor flush for 5 minutes once or twice a year.

^ definitely a good idea.

Auto-rx and amsoil make a flush as well

I know the car has a turbo. The silencer has been off over a year. This sound is new and considerably louder than it was when I first took off the silencer. The banjo bolt filter has been removed. The turbo was replaced not long before I purchased the car and other than a bad starter the car has been very reliable. I am going to put the silencer back on to eliminate that from the equation. Again, no check engine light and no loss of power. The car performs as it always has. I changed the oil two weeks ago.

Curious but why remove the banjo bolt filter? Does it clog?

Curious but why remove the banjo bolt filter? Does it clog?

 

 

It can. Search.

Did you recently install a new air filter? I just switched to the AVO panel filter, and there's much more wooshing and sucking up front. That's what she said.

I know the car has a turbo. The silencer has been off over a year. This sound is new and considerably louder than it was when I first took off the silencer. The banjo bolt filter has been removed. The turbo was replaced not long before I purchased the car and other than a bad starter the car has been very reliable. I am going to put the silencer back on to eliminate that from the equation. Again, no check engine light and no loss of power. The car performs as it always has. I changed the oil two weeks ago.

 

There we go...more info.

 

Tighten the bolts at the turbo to TMIC. Be careful, the threads are aluminum.

Curious but why remove the banjo bolt filter? Does it clog?

 

07+ do not have the banjo filters in question.

07+ do not have the banjo filters in question.

 

Oh thanks dude, wasted my time looking that up, I literally just read that on the "Turbo failure wiki" sticky.

Mine made the whooshing noise with my K&N. Drove me nuts on my DD so I traded for a stock intake. Now I'm stage 2 and its back. lol. Guess the FMIC just makes things louder all around. This is with the silencer on, too. Just replaced the filter and it did get a bit louder. Its hard to hear over my exhaust though.

Mine made the whooshing noise with my K&N. Drove me nuts on my DD so I traded for a stock intake. Now I'm stage 2 and its back. lol. Guess the FMIC just makes things louder all around. This is with the silencer on, too. Just replaced the filter and it did get a bit louder. Its hard to hear over my exhaust though.

 

no. it's the fact that the downpipe allows the turbo to flow more out thus taking more in. i still have this stock intake with my process west and 20g and it wooshes like hell and sounds more like an apache helicopter than rushing air due to the compressor blade design

The problem turned out to be the connection from the intercooler to the throttlebody, it had come off at the TB. Found a leaking coolant hose near the turbo also so I was able to take care of that at the same time. I also put the silencer back on while I was at. I suspect the connection that came loose may have been at least partially loose for awhile because the car seems to run better than ever now. I was having stuttering issues during acceleration that were intermittent. That issue seems to be mostly gone as it accelerates much smoother now.

best. thread. ever.

The problem turned out to be the connection from the intercooler to the throttlebody, it had come off at the TB. Found a leaking coolant hose near the turbo also so I was able to take care of that at the same time. I also put the silencer back on while I was at. I suspect the connection that came loose may have been at least partially loose for awhile because the car seems to run better than ever now. I was having stuttering issues during acceleration that were intermittent. That issue seems to be mostly gone as it accelerates much smoother now.

 

There we go...more info.

 

Tighten the bolts at the turbo to TMIC. Be careful, the threads are aluminum.

 

Glad you found it, that was going to be my next guess. I took the easy one first.

best. thread. ever.

 

apparently you havent found the proud to be NA thread yet

Do the N/A guys have one of those "pride" parades too?