Ok this is going to be a strange one to describe, but I'll tell what mods I did.
AFE stage 2 PG7
Magnaflow 4" w/muffler
DP chip set on 80 econo
HPX
prepump filter & harpoon mod
boost buster thingy for MAF

Sounds like it is comeing from the intake/filter.......When I get on it pretty hard & let off it makes a poooof wooosh sound.........if I get on it & let it it shift under power, just after the shift, from the sudden rpm drop I assume, the pooof wooosh sound is alot harsher....more like a squaaak.....kinda reminded me of one of those party favors from a new years eve party, you know the ones you blow in & they unroll & make a squaaak sound.

The pooof wooosh I can duplicate by free reving to 2000-2500 & letting off, & you can tell its comeing from the intake.

Any ideas, normal ?? it just kinda scared me the first time I heard it hehe.

 

It's all good man - no worries. You are just hearing it now with the new open intake - that is completely normal turbo sounds. Enjoy!

 

It's your turbo barking at you. Nothing to worry about.

 

Hehe good to hear I kinda thought so but this is my first diesel & wanted to ask just to make sure.

Thanks guys.

 

Oh ya I forgot to list the CCV mod hehe.

BTW how do I get a SIG ? I looked & didnt see a way to make one in my profile.

 

Under "control panel" there is "edit signature". I get there quickly by clicking on "private messages", but you can get there by "user cp".

 

As spingerpop would say that is darth vader speaking to ya. You do want to make sure you dont get into a turbo surge/stall (chattering sound) situation.

 

Yes, that surge can hurt ya. The turbo is spinning then the RPMs drop off suddenly. Well that air has to go somewhere and what you are hearing is that air going through the vanes and out through the intake. This is hard on the turbo. I've learned to anticipate it and back off the throttle in order to manage boost right before the shift.

 

I was thinking about getting the ATS housing & Big Head actuator to upgrade the turbo & help prevent that surge.
Since I had never experienced it before I had no idea what to expect.
What do you all think about useing a WW along with the ATS housing ...... any benefits?

 

So this whoosh sound is bad or is it ok? I run the same intake and I also hear the whoosh that he describes but I never hear anything that sounds like chattering. Are we talking about two different sounds?

 

If you go with the ATS Housing you wont need the WW. Actually the WW will cause a loss of a couple of PSI on the top end.

The wooosh is excess boost bleeding off at the upshift and is non damaging
the chattering is surge/stall and can cause damage to the turbo.

 

The woosh noise is completely normal, learn to like it. Before with the stock intake, the box was so restrictive that it just muffled the sound. If you were really good you might have been able to hear it woosh very faintly.

The sound you DONT want to hear has been described as a "chuffa chuffa chuffa" or someone saying "what what what" as fast as they can. What is happening is that the air being pushed out of the turbocharger meets too much resistance due to restriction (how boost is made) and eventually the backpressure is too great, at that point it shoots a small amount of air backwards past the compressor wheel and back out of the intake. This can happen as the turbocharger is a centrifugal pump and not a fixed displacement. When the air passes back out through the intake, it slows the compressor wheel down very rapidly. However the exhaust flow is still the same or near the same, and this puts a very high torsional load on the shaft as the exhaust pushes it one way, and the boost pushes the wheel the other way.

Changing to a WW will only change the point at which it surges, because of the different blade count and pitch. There is a tradeoff to the cheap ($60) price, it loses about 2-3 claimed psi over a stock wheel. However i firmly believe you don't want to push the stock exhaust housing past a boost rating of 25psi, as the backpressure on the engine will be way too high and very inefficient. The other fix is the ATS compressor housing. It permanently fixes surge due to the design of the housing. However it costs more to do it the right way, around $405. I have both. I had the WW at first but wanted more whistle so i got the ATS housing. Boy does the combination scream, it's not for the person who likes to cruise quietly. Cruising at 70-80mph around 5-7psi of boost, there is a constant whistle from it that you can hear slightly over the radio. I've rode in a truck with the ATS and stock wheel and it is nowhere near as loud as the WW included.

 

Good descrition Kris!


Can we get you on video making the "chuffa chuffa chuffa" or "what what what" sounds! Merry Christmas man!

 

That was a good description. Good to know I do not have the surge problem. I do have the whoosh though and I like it.

 

If you are not loaded, the only time you may hear it is in OD, pulling a hill at a good pace running some boost at a low RPM..