Howdy y'all!

So for a while now I have been attempting to track down a troublesome gremlin/Bugaboo... which has taken the form of extremely loud/noticeable hissing whenever I am accelerating from already being at a high speed (50mph+).

It almost sounds like the Wastegate/Turbo fart, but instead of being a couple seconds, the sound is constant.

The mind tends to immediately jump to boost leak... so in addition to buying some brand spankin' new Intercooler Pipes (old ones had misshapen ends), I also purchased/installed a new Y Collector/Up-Pipes (what a horrible, horrible job that was), the sound remains.

For All I know, this could be a completely normal sound, but I just can't shake the feeling that something is amiss... so I busted out my high tech microphone and did a little recording for y'all, so have a listen!

https://youtu.be/D1lM7qu-Rqo?si=zeqa6EN6cJbdaDWA

 

Charge air coolers go bad too. Just because you changed out the pipes doesn't mean you don't have a leak between them. The plenums can also leak. The boots and their clamps can have failures also. All of these are fairly easy to diagnose and find.

 

This should fix the link so others can view your video easier (more people diagnosing).


Not sure on the sound. It doesn’t really sound like a boost leak to me, but doing a pressurized test is always recommended to confirm.

It sounds more like compressor stall if I had to guess. Not sure what would cause that (if that’s what it is). Your air filter clean?

 

In addition to above inspect the turbo compressor wheel for contact with housing. A tiny bit of motion when pushing it around is ok but it too loose the wheel can make contact.

Hope that's not it.

 

I did not watch before my first response, but that sounds like metal to metal to me. Does it seem to run OK?

 

Sounds like an ebpv opening to me.

 

Mine had a hissing sound under load ( towing 6k trailer) below 2k rpm. Above 2k hissing not noticeable. Up pipes and ebpv delete cured my hissing.

 

Sounds like my F350 with the KC s300 turbine wheel...I can here more air being moved through the down pipe.