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Old 05-12-2019, 06:43 AM   #1
smoothdurban
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Default 15G Idle ring.

Hey.

I just finished a 15G swap on my B230FT and I noticed a ringing type sound and idle.

The turbo is used, I bought it from a member here a few months back. I know on the hot side of the turbo there is a cup or sorts that separates the turbine wheel from the cartridge. Is it possible this is rattling around. Perhaps I didn`t clamp the hot side housing to the cartridge sufficiently when I reclocked it.

when I blip the throttle it goes away and returns when the engine speed returns to idle.
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Old 05-12-2019, 10:32 AM   #2
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Are you certain where the sound is coming from precisely? Try using a length of hose or tubing up to your ear and try to find precisely where the noise is loudest.
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Old 05-12-2019, 11:48 AM   #3
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Sounds like you got a junk turbo like the past 3 turbos I’ve bought off of TB.
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Old 05-12-2019, 01:06 PM   #4
smoothdurban
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Quote:
Originally Posted by dbarton View Post
Are you certain where the sound is coming from precisely? Try using a length of hose or tubing up to your ear and try to find precisely where the noise is loudest.
Dave
I`ll check with a stethoscope next time I run it, it seems pretty certain its coming from the turbo.

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Originally Posted by iHateVolvoPeople View Post
Sounds like you got a junk turbo like the past 3 turbos Iíve bought off of TB.
Yikes! Last 3? If that`s the case any recommendations on where to buy a good cartridge?
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Old 05-12-2019, 06:33 PM   #5
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I went to a jy and got my 16t. You can examine the shaft play before you pull it! And usually a decent amount cheaper too
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Old 05-12-2019, 07:23 PM   #6
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Originally Posted by Mbeas96 View Post
I went to a jy and got my 16t. You can examine the shaft play before you pull it! And usually a decent amount cheaper too
Thats always an option but I am ok with buying something new (and paying for it) I just dont trust any of the ebay $168 cartridge specials.

I am about a 2.5 hour drive from Cherry Turbos in St. Thomas so I dropped them a line what I am looking for. I am curious if there are an other reputable online sources.
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Old 05-12-2019, 09:30 PM   #7
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Yeah I wouldn't either for 168 bucks lol. There was a thread on here not long ago that someone had bought just that from ebay and it was spewing oil everywhere within 500 miles
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Old 05-13-2019, 10:02 AM   #8
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I also rebuilt a blown 15g from here with a cheap $30 kit (huge mistake presumably) and then paid another $60 to have it ‘balanced’ and when i went to pick up the turbo from the balance shop it was still disassembled. It had small divets: one one the compressor wheel and one on the turbine wheel. Guy at the shop just told me to ‘line them up by eye and tighten it up’

In hindsight, you don’t need to balance a factory turbo that you rebuilt since the compressor wheel and turbine wheel (with shaft) are balanced separately from the factory. That’s what i was told at least. I should’ve just bought a better rebuild kit and rebuilt it and let it be. My $30 rebuild lasted 1500 miles.

Also, people should stop selling junk turbos on here.
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Old 05-13-2019, 10:12 AM   #9
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Default 15g

I've got a 15g that makes a ringing sound on the cup with I spin the exhaust wheel. I only noticed it when I took the housing off to port it. I'm hoping it stops when I reassemble it.
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Old 05-13-2019, 10:13 AM   #10
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Did you take it apart? A compressor or turbine fin brushing on their respective housing might make the noise you're describing.
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Old 05-13-2019, 01:26 PM   #11
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Quote:
Originally Posted by iHateVolvoPeople View Post
Sounds like you got a junk turbo like the past 3 turbos I’ve bought off of TB.
Rebuild kits are cheap and easy to install

Edit; you’re doing it wrong
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Old 05-13-2019, 01:37 PM   #12
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I've bought my parts for a rebuild from Gpop shop. Wasn't a cheap kit but wasn't over $100 either. Another choice they provide is a chra for exchange.
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Old 05-13-2019, 02:04 PM   #13
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Quote:
Originally Posted by Jack View Post
Rebuild kits are cheap and easy to install

Edit; youíre doing it wrong
I took extra caution as to do it properly, and followed a rather in depth video. It was just a **** rebuild kit.
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Old 05-13-2019, 02:22 PM   #14
smoothdurban
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This is the sound

https://youtu.be/xyclA81HXHI
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Old 05-13-2019, 04:04 PM   #15
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Sounds like the wheel is scraping? I would take the intake hose off and see / feel / hear if it's scraping.
It could be that the hot and cold side are not perfectly aligned when you tightened the clamp.
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Old 05-13-2019, 04:11 PM   #16
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A rebuild kit for 100 bucks and a whole chra assembly for 100 bucks is a different story lol

I'd go for the kit and do it yourself rather than buying a cheap center cartridge
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Old 05-13-2019, 04:51 PM   #17
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Quote:
Originally Posted by Fa182 View Post
Sounds like the wheel is scraping? I would take the intake hose off and see / feel / hear if it's scraping.
It could be that the hot and cold side are not perfectly aligned when you tightened the clamp.
I checked the compressor side and it is not scraping and spins freely.

I will pull the turbo and leave the turbine housing attached to the manifold and hopefully some more will be revealed.
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Old 05-14-2019, 03:09 AM   #18
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Carbon buildup
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Old 05-14-2019, 07:41 AM   #19
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Quote:
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Carbon buildup
I’ve seen this too. Lots of buildup on the turbine backing plate causing the wheel to rub. You can pop it off and wire wheel it.
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Old 05-14-2019, 12:30 PM   #20
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Quote:
Originally Posted by iHateVolvoPeople View Post
I’ve seen this too. Lots of buildup on the turbine backing plate causing the wheel to rub. You can pop it off and wire wheel it.
you cant even rebuild them. Best for you to get a golf
at this point this turbo is probably crap
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Old 05-17-2019, 10:13 AM   #21
smoothdurban
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Ok so i finally got around to removing the turbo from the turbine housing and I didn't find a smoking gun. However on the plus side the turbine blades were not in contact with anything.

After talking to Herman at Cherry turbos he recommend the mating surfaces between turbine housing and the CHRA be sand blasted, to ensure you get as clean / tight as a seal between these components as possible.

Not wanted to shoot a bunch of sand around my engine a settled for a dremel with a wire wheel.

After cleaning the surface as best I could I reassembled everything and everything is quiet as it should be.

I am pretty certain that noise was the heat shield wasn't seated properly and it was rattling around.

Needless to say I will not be in the market for a 19T just yet. . . unless someone has a screaming deal.

Cheers!
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Old 05-18-2019, 07:29 AM   #22
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Wait! That ringing is supposed to be there. It's critical to proper spool.
Did I get to you in time?
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Old 05-18-2019, 08:45 AM   #23
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Quote:
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Wait! That ringing is supposed to be there. It's critical to proper spool.
Did I get to you in time?

Too late its blown :(

Do you sell those electric turbos Dave?
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