cars making this loud high pitched whistling noise under boost, not there until the turbo starts building boost. Does anyone know wtf is going on?

2005 Sti mods are:
-AEM CAI
-Helix Up
-Invidia DP
-Perrin EL Manifold
-Srs catback

 

It's your turbo spooling.
Good one.

 

i can hear the whistle sound over the turbo spooling......... really annoying high pitched whistle, has to be related to boost because the more boost you build the loud it gets.

 

Welcome tot he up pipe exhaust leak. Mine leaks, we used the AP Street Tuner software to see if I was hitting target boost and I was so I don't care. Only happens to whistle under boost, either it will close after enough carbon build up happens or you could double gasket the header to up pipe section or try other gaskets until it goes away. GL

-Gio

 

Yup, mine does that all day too. Lols. You lose some boost sometimes - sometimes you dunt. Getta uppipe with a flex joint. Thats what Speedelement told me when i went there haha.

 

thanks guys, its holding boost just fine, so i'll just let it be.

 

maybe i have the same thing, except mine starts whistling since start up. any one know whats wrong?

 

Yup sounds like an exhaust leak. I think it is due to the 2 bolt after market up pipes. I use to get it until the piping heated up. After I switched to a 3 bolt design (which included headers) the noise never came back.

 

Use some better gaskets. I fixed mine using a copper gasket set.

 

One time I had a leak from my BPV to my TMIC and it made this super duper loud high pitched wine - so you might want to check the bolts on your BPV and TMIC.

 

Also check the intercooler hoses.

 

mine does it too..but goes away after the car warms up a bit..

 

maybe it would be better if you put your stock intake box on.

 

hai, i had the same problem couple days ago, sounded like a supercharger going with the boost, not rpms. it could mean leaky uppipe or boost leak after the turbo if it sounds like this http://www.youtube.com/watch?v=wS-x472vFJs

i thought it wasnt untill i tightened everything [even though everything LOOKED tight] the sound went away due the a leak at the intercooler hose. i thought it was the rip in the turbo inlet pipe but it wasnt, but it gave me a reason to upgrade the turbo inlet anyways. good luck.

 

yeah, I got that once when I had to use a friends BOV so he could use my BPV for the state ref. It was the most annoying thing ever.