[V8] Noise under load @ 1800 RPM

[Dave Saad]

I have a 5-speed and the center diff is a Torsen - no electronics  
involved - so I am unfamiliar with your setup. But you have an  
electric locking unit so somewhere there is a fuse to pull or wire to  
unplug.  Just remember, if you you can pull a fuse on a scooby and  
cause the center diff to turn off, you can pull a fuse on a V8 and  
make the whole car turn off :-)

Dave

On Mar 5, 2009, at 8:37 PM, Seamus O'Carey wrote:

> It seems like the mounts are good, since I don't notice any excessive
> movement, but I'll have to check more closely.
>
> And, yeah, I was hesitant to mention the "other", but I figured  
> since the
> shop guy brought it up first I merely quoting someone else.  It's  
> like how
> when you're a kid you're allowed to swear as long as you're quoting  
> someone
> else!
>
> So is it possible to pull a fuse to disable the center diff or not?
>
> On Thu, Mar 5, 2009 at 6:37 PM, Dave Saad <dsaad at icehouse.net> wrote:
>
>> On the 5-speeds, there is a removable cross member under the car - at
>> about the middle of the car.  If you have the same cross member, and
>> you have worn out motor mounts (likely) then the drive line clanks on
>> the crossmember under hard acceleration and it is very audible in the
>> car.  No one outside would hear a thing though.
>>
>> One easy way to check for worn motor mounts is to look at the "torque
>> stop" thing that looks like a motor mount up near the alternator.  If
>> that is broken, you need new mounts.
>>
>> I will ignore the fact that you mentioned scuberdoo in the same
>> sentence as V8, but be warned - the Audi gods never sleep....
>>
>> Dave
>>
>>
>> On Mar 5, 2009, at 7:17 PM, Seamus O'Carey wrote:
>>
>>> I've been trying to get to the bottom of this noise issue since I
>>> bought the
>>> car.  I thought maybe it was just a loose exhaust hanger, but I just
>>> had it
>>> checked out and the entire exhaust system is solid and all the  
>>> hangers
>>> intact.
>>>
>>> We did discover, though, that the noise comes on only under load
>>> (whether
>>> accelerating or while standing still with the car in gear) and very
>>> suddenly
>>> just before 1800 RPM, and goes away a little after 2k.  Inside the
>>> car, it's
>>> a loud grumble that you can feel through the seat/floorboard.  What
>>> confounded us, however, is you can NOT hear the noise from outside
>>> the car.
>>> Not even a hint of it, even with the window open.
>>>
>>> The guy at the exhaust shop thought maybe it was coming from the
>>> center
>>> differential, just behind the transmission (even though he listened
>>> to it
>>> with a stethoscope and still couldn't hear anything).  He mentioned
>>> something about how Subaru owners can pull a fuse that will disable
>>> the
>>> center differential in their cars, which would help them diagnose
>>> something
>>> like this.  Do we have something similar in the V8?
>>>
>>> Seamus
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