Track off and noise now, whats up?
#1
Burning Brakes
Thread Starter
Track off and noise now, whats up?
07 Z06 R6 13K mi etc. had an off, was a tail around spin sideways into the dirt infield. Hi spd, and enough to get rocks way in the outside tire beads. Now I've got a whining sound that goes with driveline gear speed. Not engine, in all gears, much less in neutral coast, is worst under load. Clutch and brakes were put to the floor after correction attempt.
I don't think it's diff. Changed all 4 wheels, no difference, braking makes no difference. Steering swerves to shift weight don't change sound. I'm still thinking maybe I may have jammed a wheel bearing? U-joint issue? I'm going to take wheels off and give the hubs a spin to see if I can feel a bad one.
Any ideas or experiences?
Thanks in advance.
I don't think it's diff. Changed all 4 wheels, no difference, braking makes no difference. Steering swerves to shift weight don't change sound. I'm still thinking maybe I may have jammed a wheel bearing? U-joint issue? I'm going to take wheels off and give the hubs a spin to see if I can feel a bad one.
Any ideas or experiences?
Thanks in advance.
Last edited by nolimits; 08-17-2012 at 01:21 AM.
#3
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Sounds like it could be a rear wheel bearing. I had a similar issue after an off, but I couldn't track down a single bearing to replace. So, I replaced them all with SKF HD hubs/bearings. No more noise.
Would recommend checking everything out before throwing $1600 worth of hubs at it, though. It could be something simple.
Would recommend checking everything out before throwing $1600 worth of hubs at it, though. It could be something simple.
#4
Burning Brakes
Thread Starter
Sounds like it could be a rear wheel bearing. I had a similar issue after an off, but I couldn't track down a single bearing to replace. So, I replaced them all with SKF HD hubs/bearings. No more noise.
Would recommend checking everything out before throwing $1600 worth of hubs at it, though. It could be something simple.
Would recommend checking everything out before throwing $1600 worth of hubs at it, though. It could be something simple.
#5
Burning Brakes
Thread Starter
Dang, upgraded to SKFs all around but that didn't get it. Upgrade needed anyway. Based on symptoms that was likliest, right rear or rear. So now begins the wild goose chase to find the drive train whine or toss $ all at once and replace several things, ouch. Maybe alignment check, could that really cause a whine?
Last edited by nolimits; 08-17-2012 at 01:22 AM.
#7
Burning Brakes
Thread Starter
Also what did you use for video and sound, where were mic(s)? Good vid w/o wind noise yet getting engine. Windows up or down?
Last edited by nolimits; 08-17-2012 at 11:18 AM.
#8
Race Director
Dang, upgraded to SKFs all around but that didn't get it. Upgrade needed anyway. Based on symptoms that was likliest, right rear or rear. So now begins the wild goose chase to find the drive train whine or toss $ all at once and replace several things, ouch. Maybe alignment check, could that really cause a whine?
After listening to the vid it sounds like something I have on my 2004 c5z. After the headers and before the cat converters the pipe on MY c5z is of double wall construction (think of it as insulation to keep the inner pipe hot and get the cat hotter faster). It has sort of ripples on the outside pipe.
My inner/outer pipe touch each other at certain rpm and causes a rattley/vibration/resonance. If yours is stock, get under the car with a rubber/plastic mallet and bang on that section of the pipe and see if it makes a noise.
I have "pinched" the pipe with a big c clamp and it went away for a few months & came back. Or have an exhaust guy cut out the double wall pipe & weld in standard pipe, won't effect the cat.
#9
Burning Brakes
#10
Burning Brakes
Thread Starter
Thanks all, just test drove with a tech I trust, thought it was under console and might be more like torque tube shaft to trans bearing. Will scope and listen for more clues. Arrg.
#12
Burning Brakes
Thread Starter
Agree in general, and did rev in neutral test, no change, goes up with wheel speed. Its not independently direct with engine RPM only, ie neutral. This is a tough one with the noise transfer that can go on. Will find out more hopefully Mon listening to it with a scope running on lift.
#13
Drifting
#14
Burning Brakes
Thread Starter
Although mines out of track commission right now and he's running!
Last edited by nolimits; 08-18-2012 at 02:19 PM.
#15
Burning Brakes
Thread Starter
Well got the car up on the lift running and scoped it. Sound appears to be coming from rear of the trans, main output shaft/bearing maybe. Looks like a trans swap and new torque tube bearings to cover some other things. Slave and remote bleeder too. More after the swap in a week or two.
#16
Burning Brakes
Thread Starter
Well got the car up on the lift running and scoped it. Sound appears to be coming from rear of the trans, main output shaft/bearing maybe. Looks like a trans swap and new torque tube bearings to cover some other things. Slave and remote bleeder too. More after the swap in a week or two.
#18
Burning Brakes
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#19
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