Turbo bark (compressor surge)

[R.O.R-2.0]

i don't know that it's such a big deal, so long as it's not surging while you're accelerating.

only time it surges, is when i let off the throttle.. i can get it to surge in neutral.. but i can never get it to surge under power.. not yet atleast.

[theman53]

Hey guys, lets be a little more calm. I think we are all trying to help here, so I think we are on the right track, just remember tact and that everyone can have a bad day.

ROR I think once you get a DP fabbed up you will not hear the bark. It will probably still go on, but you won't hear it like the rest of us don't. I could only hear my turbo at all when I was behind the car. That 3" that I ran was .190 wall and really deadens any higher pitched sounds.

[R.O.R-2.0]

CRSMP5 turbo is living and IIRC his barks every shift.

and his turbo does not ever surge either..

[theman53]

I don't know if CRMP5 has bark, I was talking to him on the phone one day and from what he described I thought he did. Sorry if I confused anyone. It gets to a point and our turbos or at least mine made a real big noise, I thought we were talking bark but maybe not.

I really think if you get a DP on there you will do well.

[CRSMP5]

CRSMP5 turbo is living and IIRC his barks every shift.

and his turbo does not ever surge either..

when i set up my boost regulator, did my first road trip to mk1 madness i played with boost levels... below 18-21psi it surges... if the waste gate is set lower.. but cruizin at say 10-15psi no surge..

[foxracer1]

This has been discussed many times. What your hearing is NOT surge. It's the pressure difference from having intake manifold pressure and also exhaust manifold pressure then removing the exhaust
(drive) pressure.

You say you have no downpipe. What your hearing is the exhaust side making the noise from what i explained above. Surge is what the compressor does when under load you are pushing too much psi with too low of air flow(i.e. really big compressor wheel)

Your turbo and engine are not at harm.

[jb86]

My duramax has a chamber connected to the intake
Look at the center top of the engine
There is a black plastic chamber with letters imprinted on it to say duramax 6.6l
On the duramax forums- diesel place.com people block it off the make the turbo sound louder
The reason for it as I understand is to provide a place for the extra air so you don't get hammering against the turbo
So even though it may sound better to others to delete it
I'm going to leave it the way Gm designed it
Jon

[R.O.R-2.0]

This has been discussed many times. What your hearing is NOT surge. It's the pressure difference from having intake manifold pressure and also exhaust manifold pressure then removing the exhaust
(drive) pressure.

You say you have no downpipe. What your hearing is the exhaust side making the noise from what i explained above. Surge is what the compressor does when under load you are pushing too much psi with too low of air flow(i.e. really big compressor wheel)

Your turbo and engine are not at harm.

THANK YOU!!!

thats EXACTLY the answer i was looking for!!

because it sounded like it was barking from the exhaust side, not the compressor..

ok, so i just need a downpipe..

and JB86, thats an intake RESONATOR.. it quiets the intake air going to the turbo.. it has no performance gain/drawback..

[vanbcguy]

When my exhaust was open at the end of the downpipe for a while I'd totally hear my K24 bark on shifts.  Whatever you have for your intake and exhaust will greatly change what you hear.  Lots of sounds disappear in to the factory parts, kinda like they planned it that way...

[R.O.R-2.0]

When my exhaust was open at the end of the downpipe for a while I'd totally hear my K24 bark on shifts.  Whatever you have for your intake and exhaust will greatly change what you hear.  Lots of sounds disappear in to the factory parts, kinda like they planned it that way...

i have the stock turbo intake pipe (the one that connects to the actual turbo) and there is nothing more than a cone filter on the end of that..

then for exhaust, im prolly gonna build a downpipe today..

kinda interesting, but i drove the car yesterday, wanted to see if it would bark, and it didnt.. soo weird.

[steve_1995]

well i wouldent say that you are in no danger of failure. i have seen what you guys are talking about snaping the turbo shafts off, alough the things i work on are slightly larger, caterpilar c15 and alot of detroit 50 series, but the things that usually break are the ones that are running 40-50 psi. as for what is causing your issue i dont know just wanted to say that it "CAN" cause problems down the road

[vanbcguy]

When my exhaust was open at the end of the downpipe for a while I'd totally hear my K24 bark on shifts.  Whatever you have for your intake and exhaust will greatly change what you hear.  Lots of sounds disappear in to the factory parts, kinda like they planned it that way...

i have the stock turbo intake pipe (the one that connects to the actual turbo) and there is nothing more than a cone filter on the end of that..

then for exhaust, im prolly gonna build a downpipe today..

kinda interesting, but i drove the car yesterday, wanted to see if it would bark, and it didnt.. soo weird.

Mine was running with the stock intake tube and a cone filter, FWIW...