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-   -   3.8 Turbo/Engine Whine on Startup (https://www.gencoupe.com/3-8-v6-discussion-2013-up/733270-3-8-turbo-engine-whine-startup.html)

Sassmast3r 09-20-2018 03:09 PM

3.8 Turbo/Engine Whine on Startup
 
Hi!

I finally finished my turbo kit install on my 3.8. I started the 500 mile break in period a few days ago on the turbo. I've noticed a sort of whine on start up coming from the general area where the turbo is installed, which happens to be next to the throttle body. There's a lot going on in that small space.

When I drive the car, the dull whine does go up and down with the RPMs. After a while the whine quiets down as I drive and everything heats up, but it's always kinda there in some capacity.

Any idea what it could be??

I was thinking:
  • Throttle body is leaking a little? (I torqued these to spec though)
  • Charge tank is leaking a little? (again, I torqued these to spec)
  • The turbo's bearings are just whine-y?
  • Perhaps I am just super aware of the sounds of the engine now and it's normal?

I checked my vacuum lines, they seem fine. I know it's hard to give advice on a sound through text, but I figured I'd see what you guys/gals thought.

Thanks for any advice!

-Sass

bsbullie 09-20-2018 03:34 PM

You sure its not just the turbo? If it is that noticable, maybe make a youtube video and post it.

I am also a boosted 3.8 (as some others here are) and have no unusual whine.

Sassmast3r 09-20-2018 04:06 PM

Quote:

Originally Posted by bsbullie (Post 4714504)
You sure its not just the turbo? If it is that noticable, maybe make a youtube video and post it.

I am also a boosted 3.8 (as some others here are) and have no unusual whine.

Here you are.


Let me know what you think. Thanks for taking a look.

Gaijinn 09-20-2018 08:18 PM

Which turbo did you get. The prescision BB6266 or GEN2 wont sound like that. The Turbokinetics I dont know.

It almost sounds like your serpentine belt, a pulley or one of the utilities on the serpentine has a bearing going out. Doesnt sound like turbo, your in vac anyway, she wont audibly spool in vac. above -6 hg or so your way up there 12-18hg


Also if you installed a TB spacer I hope you used a rubberized fuel resistant gasket material on both sides. Those allen bolts have a tendency to loosen up and a small vac leak which is noisy and proportional to your rpm will occur,

Sassmast3r 09-21-2018 06:01 AM

Quote:

Originally Posted by Gaijinn (Post 4714576)
Which turbo did you get. The prescision BB6266 or GEN2 wont sound like that. The Turbokinetics I dont know.

It almost sounds like your serpentine belt, a pulley or one of the utilities on the serpentine has a bearing going out. Doesnt sound like turbo, your in vac anyway, she wont audibly spool in vac. above -6 hg or so your way up there 12-18hg


Also if you installed a TB spacer I hope you used a rubberized fuel resistant gasket material on both sides. Those allen bolts have a tendency to loosen up and a small vac leak which is noisy and proportional to your rpm will occur,

I thought it might be a pulley of sorts. I don't think it's a pulley. The car has 19k miles on it, and I would have noticed it pre-turbo.

I started the car this morning and ran around and stuck my head near the noise. It is seems to be coming from the passenger front bumper area, right where the intake is.

I have the precision 6266JB turbo. I know these turbos have a different wheel design and made out of a different material. Perhaps that is what is causing the noise?

Thanks for the advice.

Gaijinn 09-21-2018 07:04 AM

Quote:

Originally Posted by Sassmast3r (Post 4714596)
I thought it might be a pulley of sorts. I don't think it's a pulley. The car has 19k miles on it, and I would have noticed it pre-turbo.

I started the car this morning and ran around and stuck my head near the noise. It is seems to be coming from the passenger front bumper area, right where the intake is.

I have the precision 6266JB turbo. I know these turbos have a different wheel design and made out of a different material. Perhaps that is what is causing the noise?

Thanks for the advice.

Thats just what the noise sounds like.

Ok. I have the same. The turbo is silent. The whine is something else. I would venture to say its one of your turbo connections. Input or output. But my money is on input. When I say input I mean the exhaust gasses powering the turbo.
As you know the turbo connects on a small flanbge right where you speak of.

Going forward:
-You have the noise,could be an audible indicatior of a flange connection leak.
-Now keep watch, if you start seeing a blackish or grey spray pattern on the adjacent panels and engine near there.

If you find this you will have to dis assemble reset your flanges. (V-bands).

Tip. Use Ultra-copper/KW copper aerosol on your connections.

**You have just completedyour assembly and are starting your break in. Your input system is comprised entirely of V-bands. There WILL be some settling which will require to to re-seat them. Remember V-bands get there great seal from alignment, not gorilla torquing the clamps. Every V-band you re seat use the copper products. You will not have to redo them I promise.

Sassmast3r 09-21-2018 07:28 AM

Quote:

Originally Posted by Gaijinn (Post 4714606)
Thats just what the noise sounds like.

Ok. I have the same. The turbo is silent. The whine is something else. I would venture to say its one of your turbo connections. Input or output. But my money is on input. When I say input I mean the exhaust gasses powering the turbo.
As you know the turbo connects on a small flanbge right where you speak of.

Going forward:
-You have the noise, an audible indicatioor of a flange connection leak.
-Now keep watch, if you start seeing a blackish or grey spray pattern on the adjacent panels and engine near there.

If you find this you will have to dis assemble reset your flanges. (V-bands).

Tip. Use Ultra-copper/KW copper aerosol on your connections.

**You have just completedyour assembly and are starting your break in. Your input system is comprised entirely of V-bands. There WILL be some settling which will require to to re-seat them. Remember V-bands get there great seal from alignment, not gorilla torquing the clamps. Every V-band you re seat use the copper products. You will not have to redo them I promise.

Thank you for the advice. I will go over the v-bands over the weekend.

Gaijinn 09-21-2018 02:20 PM

The above is a distinct possibility, but watch and wait. A small flange leak wont harm anything. So wait and let the spray materialize before you start ripping stuff apart.

**I would do the following first:
Remove your bunper,...AGAIN.

Then other possibility is your inlet tubing/ elbow off the compressor wheel maybe causing a harmonic with the in coming air which is directly relative to your rpm/intake suction. Or the AEM dry filter itself.

To test this, remove the intake filter element only, run. If noise persists, remove the pipe section and connecting elbow too. Make sure the area is completely clean dust dirt free. Run with only compressor wheel drawing in. That will tell you for sure.

Odelagt 09-21-2018 03:50 PM

Spend an hour, feel the pulleys for any wobble or crunchiness, and then fiddle with the turbo once you've eliminated the more likely possibilities. And if it is a turbo related whine, have a friend shut down your engine for you and try to listen for something like this...
Or you can take off the turbo inlet hose and spin it with compressed air and see if you can detect any grind or whine as it spools down.

Importantly, that region of your engine bay is directly over your power steering pump. I know you're trying to disqualify an accessory drive noise here, but that's exactly what this sounds like. The pitch and volume seem perfectly synced to engine rpm and that's not how a large turbo works. An exhaust leak would sound snappy/sputtery, and a boost leak would sound hissy. This is a mechanical whine in perfect sync with RPM's man. I would double check the water pump, alternator, power steering pump, AC compressor freewheel, idler, and tensioner.

Honestly, it's worth your effort as just removing the belt and checking all the pulleys for play or minor grinding is an hour job, max. Just hope it's not the oil pump, which is a whole different nightmare. And from my somewhat extensive experience with engines in general, this sounds like a direct from crank belt or gear driven mechanism. That being said, I don't believe we have any direct gear systems in the Lambda engine architecture. All I can tell you with relative certainty is that this noise sounds directly proportional to engine rpm and therefore the accessory drive components are your most likely suspects.

Sassmast3r 09-21-2018 05:11 PM

Quote:

Originally Posted by Gaijinn (Post 4714678)
The above is a distinct possibility, but watch and wait. A small flange leak wont harm anything. So wait and let the spray materialize before you start ripping stuff apart.

**I would do the following first:
Remove your bunper,...AGAIN.

Then other possibility is your inlet tubing/ elbow off the compressor wheel maybe causing a harmonic with the in coming air which is directly relative to your rpm/intake suction. Or the AEM dry filter itself.

To test this, remove the intake filter element only, run. If noise persists, remove the pipe section and connecting elbow too. Make sure the area is completely clean dust dirt free. Run with only compressor wheel drawing in. That will tell you for sure.

So I put the car back on the ramps and took off the splash guards. I had someone step on the gas. When I put my head against the oil pan and sandwich adapter, the noise it is really prominent.

Do you think my oil temp sensor is causing the noise? It is screwed into the sandwich adapter.

Is the oil drain feed line causing a vibration??

I can't think of anything else. I used the right weight oil and it's filled to the correct amount.

Gaijinn 09-21-2018 08:34 PM

I dont have a sandwhich adapter so I cannot speak to whether its normal to have that sound you do. I kept my oem oil filter assy for now, and used the billet spacer with its plumbing.

Your sandwhich plate could change the sound I guess from the oil pulsating through. I would still check the compressor side stuff.

Remove the temp sensor,..plug it, see if it goes away.

Note my first impression was what Odelagt is suggesting,.....I hope its not though.


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