Join Date: Jun 2012
Location: Pittston PA/Atlantic City NJ
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3.8 Turbo/Engine Whine on Startup
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.
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.
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.
-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.
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.
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