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GardinerG
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Car: Audi RS6 Avant
Power: 510Bhp

Joined: 21 Apr 2008
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Location: Fleet, Hampshire

PostPosted: Wed Apr 23, 2008 11:44 am Reply with quoteBack to top

DRC What is it?
"Dynamic Ride Control". The system is a mainly mechanical suspension, and uses a pump to keep pressure in the shock absorbers during cornering to counteract rolling and pitching. The system can adjust the stiffness at each shock absorber constantly to maintain both a comfortable ride and high grip. The shocks are connected in two diagonal circuits each with a separate central valve. However, DRC's main advantage is that it operates without the need for most of the complicated electronics required in similar systems from Mercedes-Benz and other competitors.

DRC problems - symptoms.
This is by no means a definitive list but:
    Clanking from the rear shocks when going over uneven roads.
    Body pitch and roll more than normal
    Poor cornering - understeer
    Car become unstable under high speed braking (veers from side to side)
    More vibration through the pedals.
DRC problems - cause.
The above symptoms are usually caused by a loss of presure in the diagonal circuit(s) due to one or more shocks/pipes leaking. If the leak is sufficiently bad you will have to replace the central valve as well as the faulty parts. Note, it is believed that you also have to replace the other shock on the failed circuit, but I have not found any Audi tech info to confirm this.

DRC changes. (10/04/2008)
I emailed Jeremy Hicks on the DRC (and other) issues and he put me in touch with Paul Adcock (Customer Services bod who liases with Audi UK Tech). Paul advised me that Audi are aware of DRC issues with the RS6 and all Audi garages are supposed to order (and fit) a protective boot with all shocks ordered for RS6s now. The boot was available from 20/04/2007. This helps to prevent dirt getting in and breaking the seal (oh er). But it'll also hide the evidence!

Just spoke to Paul again and he said that the dealers were given a software update to their parts ordering system on the 17th July 2007 such that they cannot order a new shock without ordering a boot.

He also told me that the Central Valve can now be repressurised but this requires a tool that should be available in May 2008, part number ASE42501200000. Until then the central valve has to be replaced if it loses pressure. Note: The shocks and pipes can be repressurised now, it's just the central valve that can't.

So if you have had DRC repairs recently and you don't have the boot... then you need to shoot the servicing dealer as they are not doing as they were told.

Btw, they did say that they wouldn't retrospectively do this (by recall or otherwise) to non failed shocks in the interest of "not causing more problems by disturbing things".

HTH

Grant

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GardinerG
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Car: Audi RS6 Avant
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PostPosted: Tue Jun 24, 2008 3:48 pm Reply with quoteBack to top

Is it worth making this a "sticky"?

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GardinerG
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PostPosted: Tue Jun 24, 2008 3:50 pm Reply with quoteBack to top

Whilst I remember it there is no need to replace shocks as pairs.  Replacing the failed shock is enough providing the diagonal circuit is repressurised correctly (including the central valve where required).

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MarkB
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PostPosted: Tue Jun 24, 2008 3:55 pm Reply with quoteBack to top

GardinerG wrote:
Is it worth making this a "sticky"?


Sticky it is
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grizz
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Car: Rs4 , Rs6 ,T5
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PostPosted: Sat Jun 28, 2008 10:33 pm Reply with quoteBack to top

I've had a copy of a flow chat from Audi service , It states that the tech should replace BOTH shocks and the valve due to the internal damage to the valve when it's been run dry .

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Cornishmoocher
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PostPosted: Sat Jun 28, 2008 10:44 pm Reply with quoteBack to top

After talking to the chief tech at Tonbridge Audi this week, He told me taht they can now repressurise the valves, but there are only two machines in the country at the moment. One is in the training centre and the other is in Scotland somewhere, although he is not an advocate of doing it, he reckons that unless the valves have been run for ages they will be ok and can be repressurised.

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GardinerG
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PostPosted: Sat Jun 28, 2008 10:53 pm Reply with quoteBack to top

Thanks for the info Grizz and Alex.  Grizz can you upload a copy of the flow chart here?

Ta

Grant

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GardinerG
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Car: Audi RS6 Avant
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PostPosted: Wed Jul 02, 2008 10:45 am Reply with quoteBack to top

BTW, looking on KYB's site, they do recommend replacing shocks as pairs.  KYB is the manufacturer of the DRC system fitted to our C5 RS6s.

http://www.kayaba.co.uk/distributor/pr/2004-10.html wrote:
Kayaba's DRC System Used on Audi RS6 Quattro October, 2004

Kayaba's innovative DRC suspension system has been used in Audi's new RS 6 Quattro bringing even more agility and improved handling to this exciting sports estate. The DRC system had previously been used in the Audi RS 6 saloon and the RS6 Quattro - launched in 2002.

The DRC system (known as Dynamic Ride Control - DRC - by Audi) is a pure mechanical damping system which monitors road conditions and cornering forces, and adjusts the suspension accordingly. This advanced damping system counteracts movements of the vehicle along its longitudinal axis and transverse axis.

Both shock absorbers on the same side of the vehicle are connected with the diagonally opposed dampers on the other side, each by means of one central valve. By connecting diagonally opposed shock absorbers vehicle pitching and diagonal chassis movements are minimised. The result is that the car is more stable at high speeds, as well as offering greater ride comfort at any speed.

When a corner is taken, a flow of oil, and thus a supplementary damping force, is generated via the central valve between the diagonally opposed shock absorbers. When the suspension is compressed on one side, the damper characteristic is modified in such a way that rolling or pitching movements are almost entirely eliminated. As a result, this mechanically active damping system ensures that the RS6 Quattro maintains extremely good tracking stability when cornering and responds precisely to adjustments of the steering wheel.

Other advantages include: better handling, less tyre wear, lower maintenance costs, preventing any tendancy for over-steer and improved cornering ability.

Thanks to tombs for the link..

Grant

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grizz
UNIT 20


Car: Rs4 , Rs6 ,T5
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PostPosted: Thu Aug 07, 2008 6:53 pm Reply with quoteBack to top

Guy's ,I've just removed a system today that had all the "NEW " Style rubber boots fitted .
All 4 shocks were leaking , They were all almost new and were leaking from the cap on top the shock not the seal ...

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Cornishmoocher
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PostPosted: Thu Aug 07, 2008 9:02 pm Reply with quoteBack to top

Mart, you know your "theory" as how the DRC got to be on "everything", Andy Oram, the master tech at Tonbridge (the one I was telling you about yesterday and the 16bar!) confirmed it and also said that and I quote " the rubber boot is Audi clutching at straws, It is bollox, the DRc is bollox, but its on, and there is nothing that will be done except keep trying new fixes"

Thats where mine (new one) looked like it was leaking from its a silver crimped cap that the shocker shaft runs thru the middle of isn't it?

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You know that feeling, like when you've shagged someone you shouldn't have.........?

I need "RS fir my Bargehole"
Ok.... so a 3.0l TDI A5  will have do do for now..... (it is DD red tho!)
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