[Biturbos4] A whine from the rear
s_malt at yahoo.com
Thu Jul 13 09:34:25 EDT 2006
--- Chris Newbold <chris at newbold.org> wrote:
> o is loudest between 65-70MPH
> o is unaffected by gear: 3rd, 4th, 5th or 6th and
> the pitch is identical
> o is unaffected by steering inputs
> o is strongly correlated to throttle inputs:
> - it stops if you gently lift and coast
> - it stops if you dip in and accelerate
> - it returns in steady cruise
Have you already eliminated the wheel bearings?
I see your rationale - steering not effecting the
sound and the apparent throttle correlation ...
However, the throttle inputs will alter the weight
distribution and therefore the load on the failing
bearing - hence the correlation?
Lift and coast - weight transfers forward - load
Accelerate - the weight transfers rearward - load
Steady cruise - weight evens out - load relieved?
Personally, I'd be *hoping* it was the wheel bearing!
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