As the title says, guys. It seems, under normal operation, right around 15-1700rpm, especially in 4th-5th gears, this sound is loud. The second i lift off the pedal, it goes away, then comes back with depressing pedal again. Once pass the higher rpm, it goes away.

I remember a reading a member here, posting same thing, but not sureif it was the "titled" topic.

Anybody got an idea as to what it might be?

 

If you have an open intake that would be my guess the turbo sucking in the air.

 

Not sure where you live and the temp this morning but mine does that when its colder our. From the way it sounds it the EBPV closing to assist with warm up.

 

That might have been me.I am having what I call ''windnoise of a pipe rack'' coming from the turbo area.This all started when I install a ATS housing.The housing is fine but I am still wonderring what is causing this noise?It is not all the time but it starts between 10-18 psi boost.It is more noticable when pulling loads.I have tightened the wg rod,checked down pipe connection and up-pipe connections.The only thing I can come up with is that the up-pipe connection may be the culprit and it looks to flanged correctly.I have not read of anybody having tubo flutter but hell I may be the first.I am about to wits end and ready for a 38R.
Roland listened to it and did not have a clue either.

 

If it's the EBPV closing your truck would feel gutless acting like an exhaust brake is his happening all the time or when you first start running it.

 

If I had to guess... And I am I would think maybe the wg is blowing off too soon. I'm half deaf and I've heard the turbo that I sold to you a while back do it once. I know it's a normal problem for these turbos. The only advice I can offer is tightening up the rod on the wg 7 full turns, no more no less. If you want to throw some money at it you could get the banks big head wg. Good luck

 

I retract my previous statement. In the OP sig it states the EBPV has be gutted so it would be hard for that to be the cause when its not even there.

 

Thanks guys. Just got back from taking daughter to school..(45miles one way..good ol' divorce), anyway, its mid/high 50''s this morning, if not warmer, doesnt do it at idle, i have no EBPV valve, nor is my W.G. redline hooked up. I do have a FIPK kit, along with a 6637. I'm telling you, it DOES NOT matter what filters' installed, it will do it AT WIL, at those rpm range, then once at 1900+, its all gone. Really bad, keeping steady at 16-1700rpm, in 4th gear, pulling a little roller hear, by the house. I pointed it out to my daughter (7yrs old), and she says,..its a diesel..gotta love her.

Rat, i think it was you, and when reading your post, its exactly it, wind through a piperack. Its defintely from the turbo/filter area. No uppipe leak, flutter (only when loaded, above 12psi, but got w.w. for that fix, going in today)..etc I'm atta lose. Was thinking of choking off some of those openings in/around the inner fender. Also, was thinking, can the noise be contributed to the ZOODAD mod. Anyway, thansk so far, but the noise is driving me nutz.

 

Alright guys, installed my w.w yesterday ,and this morning was the first time to run her. Reacts great, BUT that da$# wind noise now, is at, "at wil" 1500rpm, and worse, a sound now, thats untolerable. Any of you think it possibly might be an "imbalance" in the turbo shaft, consisting of the new wheel and exhaust wheel. I puttng money on it now, that its defintly turbo related.

 

I really believe mine is turbo related.With 276k on mine I am going to buy a 38R from Clay when he get's more in.I do not have any other choice besides putting the stock housing back on with the WW and I am wanting to upgrade.

 

Your hearing harmonic resonanance through your intake tubing an increase in tubing size should eliminate (or drive it to a higher rpm range) but I don't think there's much else you can do for it, im assuming you do not have any funny restrictions in your intake stream, have you removed the CCV housing?
Jim & fat Monyt

 

Is this Monty or Jim barking...

Jim, what you mean "resonance"? I think i know what you mean, but increase in tubing size...where (wife would have an answer, )? Perhaps the foil delete wasnt a good idea???

No CCV, AIH, HBO, CNN...lol, got a few down already...

 

I am not real sure about that.Not saying it is wrong but I have a 4'' housing and 4'' all the way to the 6637.The noise on mine is at the turbo for sure and you can still hear the sing of the 6637.

 

Not Monty! He's sleeping on my feet, as usual (145lbs of sleeping lab is quite hard to move) I mean the intake tubing from air filter to turbo, you won't hear a resonance like that post compression, but in free air the " suction" sound can become quite annoying! Especially if there's a restriction in stream to set up a harmonic or whistle, if the CCV plastic fitting is still in the air stream you are most likely hearing the airflow disturbance caused by the CCV pickup.
Jim & fat sleeping Monty

 

With a quick unscientific calc. doing the math the volume of air flowing through that turbo inlet is mind boggling 7.3 litres per 2 crankshaft revolutions times 1500 rpm that's 5475 litres per minute of air through a 3" opening necked down from a 4" tube in free air you will hear a lot of air flow!
Jim & fat Monty