Whistle/Whine with boost.

[Farmboy444]

Ok, I know its not boost. But I have a annoying loud whinish whistle when i get about about 8 pounds of boost. It first happened oneday I was pulling a load up a hill about 16k and never did it again. But now that i have put my SCT on it started back up even when it is revertted back to stock. Here is what I think it maybe a intercooler pipe coupling leaking? I have ditched all the plastic intercooler pipes and went with the metal ones for a 2003. I first thought it was air whistling into the filter through the ZOODAD whole but i cleaned up the air and took off any little burs and it still does it loud as ever. Any help is greatly appricaitated. Oh it does have head studs

[Snake]

Does it sound like its coming from inside the turbo? I think I have the same noise

[LHMissions]

Its the turbo whistle. Normal. Swap in a larger freer flow exhaust and the whistle will get louder

[Lilpooh]

Check the exhaust up pipes and Y pipe. Look for holes or soot at the flanges and the flex bellows. Your gonna need a small mirror to see around the pipes.

[Snake]

Like the OP said, its not turbo whistle.

[Restoman]

Maybe check for shaft play on the turbo?

[raisemhigh]

tea kettle whistle

[Gatorstroke 6.0]

i got the same sort of thing going on with my truck now just started noticing it tonight. there are definatly 2 different pitched whistles going on when it boosts around 5-10 lbs. there is the normal turbo whine and then there is a much more high pitched whine and it is definatly the turbo when building boost becuase as soon as i get off the throttle to let it roll and slow down on its own to a stoplight the noise is not there. any ideas on what this is. turbo problem? oh and just less than 4 months ago the turbo was rebuilt by ford because i had a problem with my unison ring and a new one was installed.

[DerwoodF350]

It could be a cracked expansion joint on the up pipe or Y pipe, that's what I had, it made a little whistle/hiss off and on then one day the whistle got loud to almost a squeel when rpms got around 1500, frigin annoying. You'll prolly smell exhaust in the cab when idling.
When truck is cold, I fired it up went under and could feel the leek in the expansion joint.
I replaced the complete Y pipe, problem solved.
Could be ur issue.....???
Check the blue rubber hose at the turbo intercooler tube for cracks...

[Farmboy444]

ok, its not the turbo whistle. I have a aftermarket exhaust but. I have recently replaced all of the boost hoses,and i rechecked them and its not them. I do have some more exhaust in the cab. To change the y pipe how big of a pain is it? I have also thought about it being the turbo maybe a bearing going out or the vanes not working correctly. The tea kettle whistle i had this winter and that was a blow head gasket. studs and new gaskets fixed that. I hope to get these problemssolved fast. Its getting old working on my 6.0 more than i did on my 7.3 and i had triple the miles