strange sound from tubo

[mk3tattoos]

when i make full boost @18psi on the 57 trim ct26 it almost sounds like some one making a bollon scream, like when you stretch the mouth piece. should i be worried? there"s no smoke, not loosing oil, no shaft play at all. the turbo has about 6,000 miles on it. thanks for any help

 

[rayall01]

Sounds like a small boost leak, like a clamp is a little loose, or a small crack in your IC piping. I had a sound like that from a small boost leak before.

 

[TooGoode]

turbo death whine?!?!?! search for a sound clip and compare it

 

[GrimJack]

Turbo death whine usually happens at all speeds.

I'd say it's likely a boost leak. The stock plastic pieces in the IC piping path tend to fail after 20+ years and start to split. Good place to start looking, anyway.

I'd build the $5 boost leak tester and try to find any boost leaks you have with it.

Unless you have a smoke machine, of course.

 

[mk3tattoos]

i found a guy with a smoke machine, and from what i hear he is cool about letting you get in there with him and help. always a good way to learn something as well.

i have all had brand new hardpipes and a total of five coupler. my bov has a oring at the flange, i will check that as well. thanks for the tips so far. sure hope its not turbo death:nono:

 

[GrimJack]

Turbo death is usually pretty easy to spot, too. Pull off the accordion hose and spin the turbo by hand. If it scrapes, it's dying.

 

[mk3tattoos]

^^^^it spins smooth and free. Is it possible that the turbo is leaking boost?

i am going to check the bov o ring right now.

edit: ok bov oring is set, and checked the turbo again to see if it scrapes. it seem brand new like the day i got it.

 

[mk3tattoos]

just wanted to add something that i forgot. When i get into boost and let off the gas quickly, the engine seems to stumble or feel like i hit something like a rabit.

thanks

 

[rayall01]

^^^^it spins smooth and free. Is it possible that the turbo is leaking boost?

i am going to check the bov o ring right now.

edit: ok bov oring is set, and checked the turbo again to see if it scrapes. it seem brand new like the day i got it.

YES! It's possible you have a boost leak. What do you think I said before?

 

[mk3tattoos]

YES! It's possible you have a boost leak. What do you think I said before?

ummm i understand that it possible to have a boost leak....but from the turbo itself! that would be kinda bad, and hard to find. No smoke machine is going to help with that...or will it:1zhelp:

and there is some shaft play that i did not notice before, mabey I'm leaking boost through the turbo.

 

[Poodles]

Won't lose boost that way.

On the letting off hard issue, is your BOV recirculated?

 

[mk3tattoos]

Won't lose boost that way.

On the letting off hard issue, is your BOV recirculated?

the bov is recirculated with no surge to speak of. i am doing the smoke machine on monday.

 

[mk3tattoos]

so after i checked the turbo, to make sure it was spinning good and not making any noise. i go for a test drive and now the noise is louder and sound more like a SUPPER CHARGER!

so i have had this 57trim turbo that was done by performance technice for 6 months now. why did it fail so quickly, when i took very good care of it?

i would make a sound clip but i have the shittest cameras.

 

[Suprapowaz!(2)]

I once had an exhaust leak that sounded like a balloon scream, then later sounded like a supercharger. It turned out to be the exhaust manifold gasket had a leak. It only made the sound while in boost... at first. Later, I started to hear it at idle.

 

[Poodles]

Yep, exhaust leak pre-turbo will make that sound as well. Especialyl check the turbo to manifold.

Do you reinstall all the factory supports for the turbo?

 

[Mk3runner]

Them stock studs I bet if it is a leak.. My first thought was death whine..

Hmm, do you got stock studs??

 

[mk3tattoos]

they did back out a month ago. i did forget to put the brace back on after i retightend the bolts. thanks guys i will get a new gasket and go from there.

 

[Mk3runner]

Check those studs, might be time to upgrade if you haven't already. The brace is there for a reason. Also a flex pipe at some point on the dp helps reduce strain on ex mani studs.

 

[mk3tattoos]

Check those studs, might be time to upgrade if you haven't already. The brace is there for a reason. Also a flex pipe at some point on the dp helps reduce strain on ex mani studs.

down pipe is flex.and i will upgrade those studs as well. thanks again buddy!

and i will report back in a day or so

 

[grimreaper]

if the studs keep coming loose jump strait to the 7/16ths stud repair from driftmotion. Might as well if your puting a new gasket on. Once they loosen up again, it will destroy the new gasket in no time.