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Old 05-26-2013, 10:09 PM   #1
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Default Turbo makes a bad noise...Sadness ensues

So after my thread about my turbo sounding like a supercharger and discovering it was because I blew a fin off of my turbine I bought a used Turbonetics turbo. So after a brief description of the noise we will go through what has happened and how I've attempted to trouble shoot it.

The noise itself is similar to as if the blades were making contact with the housing, but its different. It sounds "choppy", but it's also really loud like it's over boosting. When I get into boost it gets the "choppy" sound, when I say choppy I mean image rolling a skateboard downhill across the sidewalk. A sort of whoosh, whoosh, whoosh, sound that gets louder and faster the more into boost I get. It's hard to describe I'll try and get a video of it.

After adapting the wastegate to the turbo I mounted it on my log manifold and everything was good. It ran fine at 7-8psi. A few weeks of that and I was getting a little bored so I decided to up the boost. I was now at approximately 11-12psi. The noise started after this. So I then got vvtuner working properly and backed off the pressure and it was sitting around 8-9psi. A few weeks of driving and the noise wasn't really an issue. The car felt fine.

I then decided to finally run my new exhaust manifold. I got that all fitted and with a few exhaust leaks got it to run. At first all was fine. Then as I put more miles on it the sound got louder, and worse. It also seems to be performing much more poorly then usual.

My first thought was bearings and turbo seals, because I wasn't running a restrictor and the turbo was used. So after doing a visual check on the compressor wheel and determining no damage had occurred I through an oil restrictor on and drove gently until I was able to diagnose further. Durning this phase the noise became really bad. So I figured it looked like there was a good bit of shaft play so I ordered a turbo rebuild kit.

Over this weekend I've:
-Pulled turbo, visually inspected for fin damage, found none
-Visually confirmed wastegate does not leak
-Rebuilt the turbo, the bearings were gross, but not significantly worn
-I pressure tested my intercooler pipe. No leaks other then my BOV popping open
-Re-decked both turbo and manifold flange, reinstalled with no exhaust leaks
-Re-attached oil feed. Now for some reason if I have the restrictor in it just dumps oil out. With no restrictor it's fine. So I left it without the restrictor and let it idle for 20-40minutes
-Test drove. Noise was still present.
-Pulled bumper, visually inspected all intercooler piping. No holes found.
-Pulled manual boost controller, which does nothing, test drove. Noise persisted
-Thought maybe my BOV wasn't holding pressure. I only had one washer to shim the BOV. So I put that in. Initially the noise was much less present. But when I drove further and boosted higher the noise persisted.

The car burns the slightest amount of oil. And out of boost drives just fine.

So any idea's? I'll try and stiffen up the BOV even more and see if that helps.

Thanks and sorry for the long winded post.
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Old 05-27-2013, 12:17 PM   #2
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Think your BOV might be bouncing???
Mine (forge) does this every now and then, and makes a violent whoosh whoosh sound... i dont have the spring set to replace it, i believe i have the green (12lb spring) and im running just over 17lbs, so it doesnt hold up under pressure too well, and sounds angry
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Old 05-27-2013, 02:36 PM   #3
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Hmm possibly. The thing is though I never had an issue with my BOV. Literally I could put one more washer in and get turbo flutter. I was also under the impression that I didn't need a spring rated for a certain psi because I have this style BOV

Aluminum Adjustable Billet Anodized Type H RFL Turbo Blow Off Valve BOV Gold | eBay

Where the spring is pretty much there just to return the piston and keep it from opening under vacuum...But I could be wrong.

Could I have possibly torn the diaphragm in the wastegate can?
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Old 05-27-2013, 02:41 PM   #4
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Could I have possibly torn the diaphragm in the wastegate can?
i dont see why this wouldnt be entirely possible... but idk how common or likely that is. do you have another one you can swap in to see?
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Old 05-27-2013, 02:44 PM   #5
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i dont see why this wouldnt be entirely possible... but idk how common or likely that is. do you have another one you can swap in to see?
I don't know why it would either but I only did two things before the noise really became obvious and that was, up the boost, and get vvtuner working. Since I dont think vvtuner is causing issues maybe I somehow broke my wastegate can. Idk I do have another I can swap and try out. I'm going to try and get a video right now then try the new can and new BOV spring.
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Old 05-27-2013, 07:42 PM   #6
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Old 05-28-2013, 04:07 AM   #7
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Quote:
Originally Posted by supercooper View Post
Think your BOV might be bouncing???
Mine (forge) does this every now and then, and makes a violent whoosh whoosh sound... i dont have the spring set to replace it, i believe i have the green (12lb spring) and im running just over 17lbs, so it doesnt hold up under pressure too well, and sounds angry
Are you running the forge with the 2 pistons? If so that 2nd piston, the plastic one is the problem. When there is too much pressure on the turbo side and too much vacuum on the intake side, the spring cannot close the large aluminum piston so there is not enough pressure on the little spring to keep the plastic piston closed.

The good thing about those bovs is that when at wot, the pressure on both ends is the same so the force of the spring keeps the bov shut.

Pat what are we suppose to hear in this video? Sounds like a little bit of a whine?
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Old 05-28-2013, 10:51 AM   #8
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Pat what are we suppose to hear in this video? Sounds like a little bit of a whine?
I was hoping to get the weird noise/high pitched screaming. Though I couldn't really. I'll try and get another video but maybe I'm just going crazy...I can hear it all the time, because I know what I'm listening for. However, when taking the video's my girlfriend would hear it sometimes but not others. It's really noticeable at WOT and full boost. Though clearly can't be heard in the video.

I'll take it to my mechanic to see what he has to say. If nothing still comes from it I'll either bug my buddy or rope thirdgen into this, haha

Edit: With my new turbo set up I had to clock the compressor housing to keep the outlet from hitting the hood, not a big deal except I didn't make a new wastegate bracket yet. So the waste gate is not perpendicular to the wg flapper. I assumed this would make me hit higher boost but by my gauge I'm hitting 7-8psi...
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Old 05-28-2013, 06:49 PM   #9
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I tried to record the sound again today. I could hear it but the camera could not. It doesn't do it all the time. It didn't do it when I first started driving, then it did, then later I floored it in 3rd to 6k and it didn't do it. Idk hopefully my mechanic will have some suggestions.
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Old 05-28-2013, 09:01 PM   #10
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New video, does that sounds normal? It just sounds like its spinning too fast. My old turbo with the filter off wasn't that loud.
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Old 05-28-2013, 10:32 PM   #11
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Pictures of camera girl.
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Old 05-28-2013, 11:38 PM   #12
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Pictures of camera girl.
She said no, sorry
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Old 05-28-2013, 11:54 PM   #13
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That doesn't sound that weird to me. My turbo is much louder but yours does sounds a bit choppier. Not sure if the camera is picking up the sound correctly.
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Old 05-28-2013, 11:59 PM   #14
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Idk maybe it could have something to do with the vvtuner...Maybe I need to change when it goes full advance, etc. My girlfriend did notice that this happened after getting that working but I think that's more of a coincidence.
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Old 05-30-2013, 06:35 PM   #15
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I literally cannot take the insanity. Today I was leaving class. Got on it, no noise. Like a mile down the road I hit it in 2nd and the noise is loud and clear. Later on the highway 4th gear no issues. Then when I'm almost home hit it through 2nd and 3rd and it's screaming away again.

I can't handle it. Sometimes I think my clutch pedal sticks but I've never be able to re-create it. My clutch is rated at like 320ft lbs or something, and the noise definitely changes with the turbo speed, so I don't think its clutch related.

However, I had washers in my BOV. I ran out of washers so I removed all of them, and put in a nut that was approximately one washer taller then my stack of washers. Then I threw another washer on top of that for good measure. I get a tiny bit of surge sometimes, but hardly ever. Could the spring just be worn out? I tried to through in one of the ones from my friends waste gate but they're just to big.
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Old 05-30-2013, 06:48 PM   #16
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The videos you posted really don't sound abnormal to me. It's really hard to tell via video though. Good luck with this..
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Old 05-30-2013, 07:06 PM   #17
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That thing is WAY quieter than my MSM... o_O


Try this out of curiousity if you have a spare pipe: Remove the BOV completely. Go for a short drive, see if noise still happens. (It won't hurt anything for a pull or two.)


Could also have a boost leak that's just barely rearing its ugly head.
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Old 05-30-2013, 11:53 PM   #18
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That thing is WAY quieter than my MSM... o_O


Try this out of curiousity if you have a spare pipe: Remove the BOV completely. Go for a short drive, see if noise still happens. (It won't hurt anything for a pull or two.)


Could also have a boost leak that's just barely rearing its ugly head.
I've thought about doing this. The thing is I boost leak tested it at like 20-30psi and couldn't hear anything. I also visually inspected all my pipes because I've had holes rub through before. If I can't jam a tool through it, its not leaking.

I'll try boost leak testing again tomorrow with more ears on deck. I'll also try removing the bov all together.

Literally nothing has changed about my setup except for the exhaust parts. Still pulls good vac at idle, etc. I'll also try listening with a stethoscope.
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Old 06-01-2013, 11:52 PM   #19
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I boost leak tested it with my friend. We both listened and checked every intercooler connection with our hands to see if we could feel anything. Nothing.

I blocked my BOV, no change.

Idk I'll try stethoscope-ing it tomorrow to try and hear something.

My mechanic suggested exhaust leak, but that wouldn't cause the turbo to over spin...would it?
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Old 06-02-2013, 11:55 PM   #20
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I noticed that turbo only seems to make the noise when its hot. The first couple of pulls will be totally normal. Then it just screams if I get on it hard. In addition to this I'm loosing like all of my top end power.

Could it be from not running a restrictor? I have one but every time I try to put it on I leak oil...
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