New whistle on acceleration?????

[tinner]

Hopefully someone will be able to tell me where to start looking on this one. I have searched and searched but so far not found anything that sounds like what I am hearing on my truck this time.

A little background: 2006 F250, EGR Delete and head gaskets three months ago, new oil cooler 6 months ago, coolant filtration on the way. cat delete and straight piped stock exhaust.

Ok, here is the new issue. Upon acceleration, and it does coincide directly with turbo boost, but now hearing a loud whistle that I first thought might be electronic bleed through coming from the radio or radar detector, but with both off I still hear it. Now granted, after deleting cat and straight piping exhaust, I do get more turbo whistle than stock, but this is new and much louder and can be heard in the cab with windows up.

I have crawled under the hood and had my wife rev the engine til the boost gauge started registering. she can hear it inside but I am not sure I can hear it under the hood....hard to tell over the engine noise and exhaust noise, but will try again tomorrow when not so cold and frustrated.

Anybody have any experience with this or any ideas of what to check?? I was thinking possibly one of the boots off of the turbo maybe cracked etc, but have not been able to verify this yet. Any help would be greatly appreciated and all suggestions welcomed. Thanks.

[GregsSD]

Check your up-pipes that feed into the turbo, the flex joint is a common place to get a crack.

My passenger side up-pipe has a very small split in it and causes a high pitched whistle. I am going to change it out for a sneaky pipe from Elite Diesel!

www.elitedieselengineering.com - EGRUpPipewBlockerPlateSneakyPipe

[acarpen250]

Sounds exactly like the up pipe issues I had on mine. Motor had to warm up for it to be very pronounced and then would only whistle at certain pressures (I am sure it was leaking all of the time, though). I literally got my 2005 out of the shop for this yesterday. Get ready to spend another $750-$1000 if you get someone to replace both of them for you...

[fixxxer-upper]

Check all of the intercooler boots as well. They are prone to wear out from the oil build up from the crankcase ventilation. I also had a leak in the braided section of my turbo intake Y pipe that caused some extra whistle. You can also inspect the connection from the left exhaust manifold to the intake Y pipe. The bolts on my truck were damaged and there was a 1/4" gap there too!

[southend]

Mine does something similiar, its the radiator cap.