Turbo problem?

[tcourse]

When I lift the throttle I get what sounds like a large exhaust of air from the passenger side. Much more noticable when truck is warmed up and under load with heavy throttle. This is new, was not there a week ago. Could it be wastegate dumping air?



Where should I start looking? Hoses seem to be intact.



Thanks for any help,



TC

 

[Bob Wagner]

did the air mask drop?

Terry, The sound is completly normal. Its your turbo "Barking"

 

[tcourse]

Really

So how could I drive this truck 70,000 miles and not notice it.

Do my mods have anything to do with it?

 

[tcourse]

BOB

I have been driving a lot mor agressively since my



trip to Abbotsford

 

[Bob Wagner]

Re: Really

Originally posted by tcourse

.

Do my mods have anything to do with it?

 

[MikeR]

Since you put in the brass boost elbow you now can build and hold more boost with your added power. When you power up, then jump off the throttle the built up boost has to go somewhere. Before, it would go out the wastegate. Now, the gate essentially no longer opens.



I went up t Bill's shop last monday thinking I might see you there, but all I saw was your truck up on the rack.

 

[tcourse]

Mike

Thanks for the info, you to Bob.

Anytime I hear something out of the ordinary, I like to idenify it.

I know to many people that ignore things and end up with a lot

more broken parts than if they just pay attention and fix things

as they arise. Glad I have this wealth of knowledge to draw from.



Thanks again guys,



TC

 

[bigbrassmonkey]

sometimes called turbo choke, turns heads like my harley

 

[CumminsAholic]

Somebody was working on a fix for this a while back. Has anybody heard anything yet? They were going to add some sort of pressure relief valve, so when the pressure backs up its "disposed of properly", instead of trying to spin the turbo the other way. I can't remember who was doing this, but I think Marco was involved... maybe I'm wrong though. I do know that somebody was working on it though.

Corey

I found it. Nothing came of it. https://www.turbodieselregister.com/forums/showthread.php?s=&threadid=20930&highlight=turbo Marco was involved... by the way, what happened to our Italian friend?

 

[Steve Campbell]

Could it be you just sucked your air horn into the bottom of the air box and now the barking is more noticeable?

 

[Bandit1]

can turbo barking cause any damage?

 

[SEmerson]

yes it can brake the turbo. It is very hard on the turbo.

 

[juicedcummins]

Possible cracked exaust-manifold. they crack in the centre buy the turbo mine started at the bottom and came around the top.

 

[R.ebel]

When you power up, then jump off the throttle the built up boost has to go somewhere. Before, it would go out the wastegate.

MikeR,

Not trying to flame you or anything but there is NO WAY that excess boost can go out the wastegate.

Unless you burned a hole through a piston



What happens is that when you lift out of the throttle to rapidly, the drive pressure (on the turbine side) becomes less than the boost pressure (on the compressor side) and the boost pressure turns the turbo backwards blowing air out of the air cleaner making a barking sound.

 

[hammong]

The sudden back-rush of boost through the turbo dramatically increases your turbine/thrust-bearing wear. You turbo will be happier in the long-run if you back off the throttle a little slower to prevent the "barking" noise.



Gasoline turbocharged engines typically make use of a "blow-off valve" to release the pressure. The BOV is actuated by a vacuum/boost line that is tapped off the intake manifold. When the throttle closes, vacuum is produced in the manifold, which sucks the valve open, providing a path for the boost charge to be vented either to atmosphere ("whoosh!") or to be re-circulated around the turbo.



I don't think a BOV will work on a turbo diesel because there is no butterfly valve (in a throttle body of a gasser) to cut off the intake airflow, which would produce the vacuum. I suppose somebody could produce a complicated version that was solenoid-actuated from the truck's vacuum pump supply, and trigger it off of boost and throttle position sensor conditions.



Greg