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D3 - Axles, Brakes, Suspension and Steering Brakes, Springs, shocks, steering racks, steering columns, suspension arms, wheel hubs etc.

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  #11  
Old 5th June 2015, 10:13 AM
NightOwl NightOwl is offline
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Quote:
Originally Posted by ainarssems View Post
Stiffer at the front will give you more understeer, stiffer at the back will give more oversteer (or less understeer)
That's true, but as its so easy and fast to replace the front bar, I'll probably do both. Should take less than 30 minutes. Also, I think the prices for the S8 spec anti-roll bars are relatively cheap, so why not go all the way.
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2006 Audi A8 3.0 TDI Quattro Sport
A8 W12/S8 Brakes front and rear (385mm/335mm)
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Xenon fog lights
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  #12  
Old 5th June 2015, 10:39 AM
NightOwl NightOwl is offline
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Quote:
Originally Posted by ScottD3 View Post
Not a massive difference.

Not as big as I was expecting.

Be interested to see what difference it makes though.
At a closer look, guessing yours is a non-sport.
Change in outer diameter from 30,3 to 31 mm is just an increase of 2%, but as the bar is tubular, the wall thickness has increased with almost 40%.

I'm not an engineer, but I'm pretty sure the stiffness of the bar is considerable more, and easily noticeable on the car.

For the rear, I've only found the thickness of 20 mm (solid bar) for the S8 spec, not sure about the others.
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2006 Audi A8 3.0 TDI Quattro Sport
A8 W12/S8 Brakes front and rear (385mm/335mm)
Focal and JBL speakers, Helix amps
S8 anti-roll bars front and rear
Complete rear LED taillight
Xenon fog lights
All interior LED
S8 rims 9x20"
Stage II tune
S8 Grill
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  #13  
Old 1st December 2016, 10:04 AM
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Conquistador Conquistador is offline
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Anybody happen to know the part number for S8 D3 front ARBs? Mine are creaking like an old Spanish galleon in the cold and they need to be replaced.
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  #14  
Old 1st December 2016, 10:54 AM
mattylondon mattylondon is offline
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4e0 411 305 ac, 31x4.7

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  #15  
Old 1st December 2016, 11:26 AM
snapdragon snapdragon is offline
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My new one fitted by Audi creaked after just one winter, I should have taken it back before the 2 years was up but the warmer weather arrived and I forgot.
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  #16  
Old 1st December 2016, 02:05 PM
Mechcanico Lee Mechcanico Lee is offline
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Audi a8 .....sports suspension , thicker roll bars ........all in the same breath




........... it would be like getting dragged along on a shovel .........
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  #17  
Old 27th June 2019, 05:01 PM
NightOwl NightOwl is offline
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Wow, four years ago I said this would be on my to-do list and only now last month I did it. The job was very easy and everything fitted just fine, little bit tricky to pull the old one out and the new one in in the rear but no real trouble. Just remember to mark where the eccentric washer is positioned.

I did the front first and I was surprised how much better the cornering became, as mentioned earlier in the thread, stiffer rear anti roll bar should fight under steer and stiffer front should increase it in a way. But that's not my experience on the A8, the under steer was surprisingly less after only replacing the front one. Then replacing the rear anti roll bar just added a little bit more as to reinforce the feeling of less body roll. I like it!

Remember, I came from Sport Suspension and the difference is not great, but easily noticeable. From a non-sport suspension I expect the difference to be much greater. I drive always in dynamic mode in the summer conditions (comfort mode in winter), and to be honest I would like the suspension to a little bit firmer in dynamic, but in the end it's an A8 so I'm very happy with the ride now with 20" wheels.
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2006 Audi A8 3.0 TDI Quattro Sport
A8 W12/S8 Brakes front and rear (385mm/335mm)
Focal and JBL speakers, Helix amps
S8 anti-roll bars front and rear
Complete rear LED taillight
Xenon fog lights
All interior LED
S8 rims 9x20"
Stage II tune
S8 Grill
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  #18  
Old 27th June 2019, 07:12 PM
snapdragon snapdragon is offline
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Nice, so what is the trade-off? I assume some kind of reduction in ride comfort?
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  #19  
Old 28th June 2019, 08:55 PM
NightOwl NightOwl is offline
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Not really, maybe on the edge of too stiff on uneven surface in low speeds like in low speed, bad maintained city streets, but then you might switch over to comfort mode on the suspension anyway. On the other hand I found that I'm driving faster on curvy roads because of less body roll. The difference is not great, but if you think your car has too much under-steer and/or body-roll, I recommend to go for it if you have the money.

What I really would like is adjustable and speed depended suspension. Soft at slow speed and gradually stiffer at higher speeds, with several fine tuning points and four or five presets.
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2006 Audi A8 3.0 TDI Quattro Sport
A8 W12/S8 Brakes front and rear (385mm/335mm)
Focal and JBL speakers, Helix amps
S8 anti-roll bars front and rear
Complete rear LED taillight
Xenon fog lights
All interior LED
S8 rims 9x20"
Stage II tune
S8 Grill
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  #20  
Old 29th June 2019, 01:42 PM
snapdragon snapdragon is offline
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Thanks for the additional feedback, yes that would be good. I wonder if they will ever 'virtualise' the ARB and just use damper control? I guess they probably wouldn't be able to react fast enough.
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