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Old 04-16-2013, 09:18 PM   #1
C J
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Member#: 132587
Join Date: Nov 2006
Location: Lincoln, NE
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2006 JrTuned STi
Stock engine 9.77@147mph

Default 2006 STi 6mt/fx400 driveline whine

Currently the car is making north of 500whp with stock transmission and Clutch Master FX400 4 puck clutch and it has developed a whine in the driveline somewhere. I have been unable to locate it so I am hoping for a few ideas or see what people have ran into in the past.

I know it is not common to trash a 6mt but maybe some guys who have can chime in as well.

So the car runs and drives fine, transmission shifts smoothly and can still run through the gears hard with no problems. The sound is most noticeable under very very light load or no load (trans out of gear). The noise is not RPM based and is 100% related to wheel speed, the faster you go the more you notice it but it is audible all the way to a stop and at low speeds. As far as I can tell it is not wheel bearings and not tire noise as I have swapped wheels tires.

Please post up with any recommendations or similar experiences.

I found a video online that is pretty close to the noise I am hearing and it is in another high hp stock transmission car. You notice the noise under deceleration and is wheel speed related.

https://www.youtube.com/watch?v=_MsdakJ5WiM

Let me know what you think!
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Old 04-18-2013, 01:37 AM   #2
Uncle Scotty
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cant watch the vid at work

this may sound dumb...but ive heard wheel bearings do that...no play or any other normal wheel bearing noise...but change it out and the noise was gone

how about the center carrier bearing for the driveshaft??

when was the last time the fluid was changed in the rearend and trans???

was the car ever jacked using the lil triangle plates that mount the rearned carrire, foreward, outboard??
if so, and they got bent they can touch the body and the carrier and make noises like that...inspect carefully

inspect all heatshields for security/vibration
is the reverse lockout cable rubbing on the driveshaft???

is a brake line rubbing on something ???

Last edited by Uncle Scotty; 04-18-2013 at 01:51 AM.
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Old 04-22-2013, 08:49 PM   #3
C J
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Member#: 132587
Join Date: Nov 2006
Location: Lincoln, NE
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2006 JrTuned STi
Stock engine 9.77@147mph

Default

Thanks for the response Uncle Scotty.

So I checked the wheel bearings and found no play, have no other way to really check them other than replace them I guess...which I really don't want to do unless I run out of ideas.

The sound seems to be coming from the front but it has developed since having the transmission out for a clutch install so the driveshaft was out a long with the shifter linkage so I will take a look.

The rearend has only ever been jacked up on the differential it self, I am not sure what triangle plates you are talking about but again something to look at.

One thing I can tell you is that it isn't the brake lines, I triple checked them just to be on the safe side when I had the wheels off.

The noise is audible even while very slowly backing out of the driveway so it is there at all speeds.

Might be worth noting but when at speed the noise is much louder, something that is very strange...I can at times (not every time) change the tone or make it higher by ever so slightly tapping on the brakes but also braking heavily will cause it to make the noise as if I am loading the driveline differently and causing something to rub harder possibly...if it is after all a rub.
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Old 04-22-2013, 10:14 PM   #4
EROCS04SBRUSTI
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Sounds like the transfer gear(s) bearings in the tailshaft.Can you jack it up safely with 4 jack stands or a lift and check?Just a guess but you did say out of gear.
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Old 04-22-2013, 11:42 PM   #5
C J
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Yea it will make the noise out of gear as well as in gear. Do you recommend running the car in gear on a lift? Or am I misreading the recommendation?
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Old 04-23-2013, 07:19 PM   #6
EROCS04SBRUSTI
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Yes on a lift if possible,or 4 jack stands lifted but do not recommend(unsafe) but if you do make sure there is another person there and a pair of balls, but it makes it so easy to find where the problem is ,hoping it doesn't need a workload or preloaded suspension. In 1st gear.
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Old 04-23-2013, 08:49 PM   #7
C J
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Stock engine 9.77@147mph

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Yea I won't have anyone climbing under my car while on jack stands. I am putting it on a lift tomorrow albeit just a drive on lift but I am going to double check everything that there is no rubbing or something transmitting the noise through the chassis. This weekend I will get it on a 2 post lift and run it in gear if needed.
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Old 04-23-2013, 09:00 PM   #8
C J
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Stock engine 9.77@147mph

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I found this thread and it sounds a lot like what I am experiencing.

http://www.clubwrx.net/forums/transm...ff-noises.html
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Old 09-04-2013, 06:37 PM   #9
WhatTurboLag?
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Did you ever figure this out? I believe I have similar noises, same clutch. I'll watch the video later to see.
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