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I remember hearing about it and now I've experienced it. Is it something to avoid? Is it hurting anything? What causes it?
 

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Here is the post I made a few weeks ago on this topic. Perhaps this is the same issue:

I called Audi USA about the low speed "chatter" that I noticed when at or close to full steering lock. I only noticed this when the car/tires are cold. They told me that, although disconcerting, this is "normal behavior" and is due to "asymmetry" in the steering which is "optimized for high speed cornering". It was also stated that it is due to tire scrubbing even though I thought it was something funny happening in the differential; that's apparently why it is more noticeable when the tires are cold.

Anyway ...that's what they said
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Its the front diff locking. Being limited slip, it cannot cope with the tight turning circle, hence the significant difference in speed of the two wheels turning.

Bottom line is that the drivetrain - gearbox, clutch, diffs are Lambo Gallardo, and about 2 generations behind RS4 Quattro - its all about saving money when building a car.

It's normal, but some cars are slightly worse than others
 

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Hang on, back on topic a minute..

Bottom line is that the drivetrain - gearbox, clutch, diffs are Lambo Gallardo, and about 2 generations behind RS4 Quattro - its all about saving money when building a car.
WHAT?
 

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From TSB 44-08-01 dated Feb 5, 2008:

Condition
A chattering/skipping sensation in the front axle during slow speed tight turns (e.g. parking maneuvers) could occur under the following conditions:
• Tires are cold or ambient temperatures are low.
• Road surface is wet/dirty.
• The vehicle has been parked for an extended period of time.

Technical Background
The R8 has the steering dynamic of a sports car. The inner and outer wheels are turned at approximately the same steering angle to ensure an even power distribution through the front self-locking differential during high speed cornering. This steering dynamic minimizes under steer and ensures vehicle stability in high-speed turns.

While maneuvering the vehicle through tight turns at slow speeds under normal conditions (e.g. vehicle parking) the steering angle difference between the inner and outer wheel is not noticeable because the tires' side wall flex is sufficient to compensate. Contact with the road surface is maintained.

However, under certain conditions (such as cold weather, wet/dirty pavement, or a long parking period), a front tire can scrub. The customer may complain about a shudder or a skipping sensation felt in the steering/front suspension of the vehicle during slow speed parking maneuvers.

This is normal performance for the sports car steering dynamic in the R8, and no repairs are required.
[Jeez guys, you are def "growing older but not up" ~ Jimmy Buffet :) ]
 
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