Clunking on full lock at low speed.

[Mark_b]

Hi folks.

As the title suggests, im wondering what would cause a clukking noise from the outside front wheel when turning in full lpck at low speed (<10mph).

Any ideas?

Cheers,

Mark.

[Mark_b]

Anyone?

[Ian_C]

All permanent four wheel drive quattros with three differentials share this trait. All four tyres are trying to scribe a different radius when you turn on full lock. The castor on the front steering lifts the tyres onto their edges when on full lock, so it will usually be one of the front tyres that judders on the tarmac

[jamiej]

Yea. If you Google Ackermann Effect you'll be enlightened.

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[Rs6dan#rs6dan]

Control arms maybe

[Mark_b]

All permanent four wheel drive quattros with three differentials share this trait. All four tyres are trying to scribe a different radius when you turn on full lock. The castor on the front steering lifts the tyres onto their edges when on full lock, so it will usually be one of the front tyres that judders on the tarmac

That's a relief!

Makes perfect sense, and also mayches the wear pattern on my front tyres!

@jamiej thanks for that, i am familiar with the principle, but was concerned as i never experienced this issue on my jag or subaru. Although if i remember rightly those 4wd systems are different to the asymmetrical torsen utilised on my audi.

Panic mostly over but i might get it checked all the same, if only due to some of the posts about loose bilts on steering racks etc.


Thanks all.

[Mark_b]

Control arms maybe

Did occur to me, in between worrying about front diff, cv joints, etc etc. Thanks gor the reply.

Am going to have it checked anyway just for my peace of mind!

[Rs6dan#rs6dan]

Sorry mate lost me phone . Couldn't remember login details. I'd say 100 % control arms . It was the same as mine when I first got mine . Or just poly Bush every thing about £600 poly bushes but will be well worth it tho good luck mate anything else just add me on Instagram @rs6dan if I dont no my mate knows everything about the rs6 c5

[Mark_b]

Turned out just replacing the front tyres has completely stopped the noise from happening.