Welcome to the North American Subaru Impreza Owners Club Friday March 29, 2024
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Built Motor Discussion

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 05-10-2022, 05:40 PM   #1
Alistairh
Scooby Newbie
 
Member#: 268286
Join Date: Dec 2010
Chapter/Region: W. Canada
Location: Alberta
Vehicle:
2011 STi
Dark Grey

Default g30-660 noise

I've got a rotated G30-660, intake is pretty much a straight pipe with an elbow into the fender well with a 3" K&N filter.
Compressor cover is the standard G30 one, 3" inlet, 2" outlet.


It makes an absolutely ear piercing whining noise at high idle, and light/medium load, even cruising @ 2k rpm in 6th on the freeway.


I had a GT3076 before on this car and it only made noise when it got pretty spooled up, and even then it was different. I've had plenty of other turbo cars, with similar intake/filter setups and none made a noise this bad.



I've sent a few videos to my reseller and they say the sound is normal with this style of compressor housing.


Has anyone else with the G30-660 or any of the G30 series noticed a noise like this?


for reference.


Anyone have ideas on how to mitigate this noise if it is normal? I can hear it pretty distinctly in the cabin. Maybe if I went to a shorter intake the noise couldn't reverb as much?
* Registered users of the site do not see these ads.
Alistairh is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 05-10-2022, 05:50 PM   #2
benflynn
Scooby Specialist
 
Member#: 515308
Join Date: Jun 2020
Default

I can tell ya a g25-550 wheel is much noisier when not in boost than my gt30r
benflynn is offline   Reply With Quote
Old 05-10-2022, 06:09 PM   #3
Thorium06
Scooby Newbie
 
Member#: 254372
Join Date: Aug 2010
Default

They are loud, its probably going to blow up
Thorium06 is offline   Reply With Quote
Old 06-21-2022, 05:20 PM   #4
kantennichols
Scooby Newbie
 
Member#: 526591
Join Date: Sep 2021
Default

I have a rotated g30-660 as well and you can definitely hear it whistling away, though I love the sound. What kind of power did you make on yours? Would love to see a build list and some graphs if you have it.
kantennichols is offline   Reply With Quote
Old 06-24-2022, 07:32 PM   #5
subaru_gc8
Scooby Specialist
 
Member#: 29292
Join Date: Nov 2002
Chapter/Region: SCIC
Location: Orange County CA
Vehicle:
2004 WRX wagon
silver

Default

Quote:
Originally Posted by kantennichols View Post
I have a rotated g30-660 as well and you can definitely hear it whistling away, though I love the sound. What kind of power did you make on yours? Would love to see a build list and some graphs if you have it.
What did you make I have a g30 660 I'm thinking of putting in my spoolinator...or going rotated

I think the only way to get rid of that noise us going to be through a resonator or I've seen a few people use a extra snorkel to quiet it down
subaru_gc8 is offline   Reply With Quote
Old 06-25-2022, 04:56 PM   #6
Bariga
Scooby Specialist
 
Member#: 179846
Join Date: May 2008
Chapter/Region: NWIC
Location: Renton, WA
Vehicle:
07 STi Limited
EFR 8474 TS EWG

Default

is the comp cover fully seated? it sounds like metal to metal griding
Bariga is offline   Reply With Quote
Old 07-23-2022, 04:34 PM   #7
Alistairh
Scooby Newbie
 
Member#: 268286
Join Date: Dec 2010
Chapter/Region: W. Canada
Location: Alberta
Vehicle:
2011 STi
Dark Grey

Default

Comp cover was as seated as it can get, I think. The bolts were quite tight.


Anyone have thoughts on these scratches?

https://i.rype.ca/s/pMWcdgKfoqXmoQk
https://i.rype.ca/s/cZ8C6JMbE3TyLL5
https://i.rype.ca/s/irA6HgzFmSNT4qL

Thanks.

Last edited by Alistairh; 07-23-2022 at 04:51 PM.
Alistairh is offline   Reply With Quote
Old 07-23-2022, 06:08 PM   #8
K3rm1tth3fr0g
Scooby Specialist
 
Member#: 508105
Join Date: Nov 2019
Chapter/Region: NWIC
Location: Greater Seattle Area
Vehicle:
Link G4X flex tuned
02' EJ205 20G 6MT wagon

Default

Quote:
Originally Posted by subaru_gc8 View Post
What did you make I have a g30 660 I'm thinking of putting in my spoolinator...or going rotated



I think the only way to get rid of that noise us going to be through a resonator or I've seen a few people use a extra snorkel to quiet it down
Spoolinator will NOT fit the G series. They tried.
K3rm1tth3fr0g is offline   Reply With Quote
Old 07-24-2022, 02:11 PM   #9
benflynn
Scooby Specialist
 
Member#: 515308
Join Date: Jun 2020
Default

Quote:
Originally Posted by Alistairh View Post
Comp cover was as seated as it can get, I think. The bolts were quite tight.


Anyone have thoughts on these scratches?

https://i.rype.ca/s/pMWcdgKfoqXmoQk
https://i.rype.ca/s/cZ8C6JMbE3TyLL5
https://i.rype.ca/s/irA6HgzFmSNT4qL

Thanks.
does the comp wheel have a lip building up on it?
benflynn is offline   Reply With Quote
Old 07-24-2022, 05:25 PM   #10
Alistairh
Scooby Newbie
 
Member#: 268286
Join Date: Dec 2010
Chapter/Region: W. Canada
Location: Alberta
Vehicle:
2011 STi
Dark Grey

Default

https://i.rype.ca/s/bRmKQqRxbWbZ5nb
https://i.rype.ca/s/DtobDXmfFk57rLx
https://i.rype.ca/s/4xPWCDLMRgXcQBE

On this one you can see some heat discolouration on the outside diameter of the base of the comp wheel?
https://i.rype.ca/s/ZgpB8mmtXmC6BRj

I dunno.

The leading edge on the outside of the fin tips aren't all the same. I have a feeling I'll be told my 1,300 km turbo ingested something and there's no warranty.
Alistairh is offline   Reply With Quote
Old 07-24-2022, 05:25 PM   #11
Alistairh
Scooby Newbie
 
Member#: 268286
Join Date: Dec 2010
Chapter/Region: W. Canada
Location: Alberta
Vehicle:
2011 STi
Dark Grey

Default

https://i.rype.ca/s/bRmKQqRxbWbZ5nb
https://i.rype.ca/s/DtobDXmfFk57rLx
https://i.rype.ca/s/4xPWCDLMRgXcQBE

On this one you can see some heat discolouration on the outside diameter of the base of the comp wheel?
https://i.rype.ca/s/ZgpB8mmtXmC6BRj

I dunno.

The leading edge on the outside of the fin tips aren't all the same. I have a feeling I'll be told my 1,300 km turbo ingested something and there's no warranty.
Alistairh is offline   Reply With Quote
Old 08-20-2022, 12:43 PM   #12
Alistairh
Scooby Newbie
 
Member#: 268286
Join Date: Dec 2010
Chapter/Region: W. Canada
Location: Alberta
Vehicle:
2011 STi
Dark Grey

Default

Just for followup:

I replaced the factory hard line with the IAG braided line kit. literally any banjo bolt to -4AN adapter would have worked w/ my setup, and would have been much cheaper, but yeah.

At the same time I also noticed the bolt for the boost reference on my external waste gate was loose.

prrrrrrretty sure it was an oiling issue. :shrug: between those two things the turbo is way quieter.
Alistairh is offline   Reply With Quote
Old 08-20-2022, 12:43 PM   #13
Alistairh
Scooby Newbie
 
Member#: 268286
Join Date: Dec 2010
Chapter/Region: W. Canada
Location: Alberta
Vehicle:
2011 STi
Dark Grey

Default

Just for followup:

I replaced the factory oil hard line with the IAG braided line kit. literally any banjo bolt to -4AN adapter would have worked w/ my setup, and would have been much cheaper, but yeah.

At the same time I also noticed the bolt for the boost reference on my external waste gate was loose.

prrrrrrretty sure it was an oiling issue. :shrug: between those two things the turbo is way quieter.
Alistairh is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -4. The time now is 03:28 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2024 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.

When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission
Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.