flexer

Just for curiosity sake, I have heard that the shrouded compressor housings give the turbo more of a whistle than non-shrouded housings. By whistle I mean that high pitched spooling sound that makes it sound like a jet turbine spinning up.

SO THE QUESTION:

Who in here has gone from a non-shrouded housing to a shrouded one and can comment on if the turbo made a different sound, and if it did what was the difference?

I know that as you go larger on the compressor wheel this sound gets more prominent. IE, the GT35R starts to make the sound. The two GT40/88R's I have heard in town make it also only EVEN LOUDER. And there is one GT45R and it is so loud its all you hear, can barely hear any engine noise........it sounds like a jet taking off everytime. I used to think it was boost level, but not true. Both the GT40R's do it even if they are running 10 psi, and the GT45R is only running 8 psi.

BUT I want to know if the shrouded housing plays a part in this. I have heard it does but want some people to chime in that have had both housings on the same turbo and can comment.

J. R.

AndyFloyd

yea it does, even my 3076R which has a ported shroud spools loud as can be.

Terror

Yes, the shrouded housing makes for a louder spool.

AndyFloyd

the reason for the louder spool is because on a ported compressor housing the slits from the ports hits the exducer of the compressor wheel where its chopping up a lot of air plus its larger down there. The whistle is amazing in my opinion, one reason why I always loved the 30R...good for power and amazing sound.

flexer

Good to know. The GT30/71R I had was SILENT. No turbine sound. All you would hear is rushing air, but that was it. Then again it was not a ported housing. Makes sense then. THANKS!

J. R.

JoeyBalls

fuk me, do they make a divided housing 35r with a ported shroud hosuing or whatever.........................I NEED TO HEAR THE SPOOL

flexer

They do, but you need to hear a shrouded GT40/88R. Its crazy. Its sounds SO GOOD, and the GT45R that is shrouded I am not kiding, we can't hear the motor or the exhaust when that thing is on its 8 psi of boost. Just sounds like a F15 taking off the run-way!



J. R.

JoeyBalls

oh god I want it..............

Im not even kidding when I say the "sound" of my setup is way way up there on my list of important things

Hope the HKS BOV sounds ok

Terror

http://www.atpturbo.com/Merchant2/merchant...tegory_Code=GRT

There is an option for the Ported Shroud.

Edit:
There is also one from Pang's website.
http://www.pfabrications.com/inc/sdetail/445

fuel4blood

Hmmm... never knew this hows the little greddy turbo sound?