It sounds just like wind in a tunnel. Goes right alongside turbo boost. Stops when letting off the throttle and starts when getting into it consistently. IC boots look fine. Very little shaft play. What could cuase this? Thanks!

Silencer ring in place.

Here you go...

 

I can’t hear anything. Just a Cummins... ?

Edited September 26, 20186 yr by trreed

6 minutes ago, trreed said:

I can’t hear anything. Just a Cummins... ?

 

Barely hear the whistle... 21* degree of timing really keeps that turbo quiet and boost low. 

8 hours ago, Mopar1973Man said:

Remember the amount of drive time I put in. I can tell you 20-21* of timing will make the turbo near silent

Absolutely true, at 70 I'm at 21 and at 60 at 19.5 turbo is at 0-2 psi

Maybe you guys are on to something with quiet singles. I had a girl in the pickup a while back who said she loved compounds because “the more turbo whistle the better”. 10 miles later she was making me drive with a light foot cause it was too loud. There wasn’t a second date. 

Edited September 26, 20186 yr by trreed

With twin turbos, there is no way to avoid the noise I'm sure. 

 

 

There is. It’s called large injectors and a light foot. The 6 x 0.013’s did the most. Dropped from 10 psi cruise to 4-5. A quarter of the noise. 

With the BHAF on mine I don't hear the turbo until I get above 10 PSI ,that only lasts until about 16 then quiets down until I hit 20 PSI and then starts to howl above 23 PSI

1 hour ago, trreed said:

Maybe you guys are on to something with quiet singles. I had a girl in the pickup a while back who said she loved compounds because “the more turbo whistle the better”. 10 miles later she was making me drive with a light foot cause it was too loud. There wasn’t a second date. 

She's not a true friend then, good let her go, cause if she was this is what she'd look like. And I think she's cute.

 

If my turbo whistles I wouldn't hear it.  I turn my hearing aids off when I drive: this makes my truck nice and quiet.    

He also turns em off when she gets on his case for not going to church. 

On demand selective hearing