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Car sounds supercharged?

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Old Feb 18, 2013, 10:34 PM
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Car sounds supercharged?
I noticed this evening that when applying load to the car in mainly 2nd-4th gear im getting a loud whining sound similar to a supercharger whine, starting at like 3.5k rpms to redline.

I just had my timing belt changed about 150 miles ago.
Transfer and trans fluids changed back in October. So prob like 6k miles ago.

All I can think of at the time any similar things happened to anyone else?
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Old Feb 18, 2013, 10:35 PM
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happen when you're on the throttle and off the throttle?

if so, might be tcase
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Old Feb 18, 2013, 10:39 PM
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Just when load is being applied so only on throttle.
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Old Feb 18, 2013, 10:51 PM
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what turbo do you have ? because my GTX3582 has a whine/whistle at low rpm and with almost any throttle input.
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Old Feb 18, 2013, 10:55 PM
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Stock 9 turbo. I've always heard the turbo spooling. This is more or a whine similar to a kenne bell whine
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Old Feb 18, 2013, 10:57 PM
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does boost still set in as normal? no jerk or boost spikes? if so the turbo could be going bad? check shaft play.....
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Old Feb 18, 2013, 10:58 PM
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Boost hits fine. No sputtering or cutting out. Will check shaft play tomorrow.
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Old Feb 19, 2013, 05:13 AM
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Are you certain its not your walboro 255? They can whine pretty loud especially if you remove the rear seat.
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Old Feb 19, 2013, 05:21 AM
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Did you change to an open air filter recently? Maybe that's what your hearing. The Turbo is a lot more audible with an open air vs. the stock air box.
Last edited by petersk2; Feb 19, 2013 at 05:24 AM. Reason: More detail
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Old Feb 19, 2013, 08:03 AM
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Originally Posted by TommiM
Are you certain its not your walboro 255? They can whine pretty loud especially if you remove the rear seat.
Nope that's a very faint whine in my car.

Originally Posted by petersk2
Did you change to an open air filter recently? Maybe that's what your hearing. The Turbo is a lot more audible with an open air vs. the stock air box.
I've had an open air filter forever.
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Old Feb 19, 2013, 08:11 AM
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Maybe your alternator. Mine got a pretty nasty whine when it was failing. It would defiantly get louder (worse) when RPM's went up. Good luck!
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Old Feb 19, 2013, 08:58 AM
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transmission?
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Old Feb 19, 2013, 09:11 AM
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Transmission, center
or rear differential. Did you upgraded to urethane bushings?
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Old Feb 19, 2013, 09:50 AM
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I had a boost leak once at the recir valve's flange. It sounded like a high-pitch whine similar to a supercharger.
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Old Feb 19, 2013, 12:56 PM
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Originally Posted by chintrebor
Transmission, center
or rear differential. Did you upgraded to urethane bushings?
Stock bushings.

Looks like I'm gonna check the fluids just to be sure.
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