Back end feels loose. S3 8p 2006

Daveyonthemove

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My S3 doesn't feel right at the moment, at high or low speeds. Almost like the rear wants to topple when cornering. Over rough town roads at 30mph or less, it feels unsettled.

Early this year we discovered that the rear shocks were past their best. Bump stops were turning to dust and rebound was non existent. New shocks and bump stops were ordered and due to poor weather they weren't fitted until March. The kit was ordered from Ebay and was listed as suitable for my car, and the seller also confirmed this. When compared they looked identical to the parts that were removed.
It's important to note that the car never felt bad in any way. Handling felt secure.

When fitting the shocks we discovered a broken coil, so we sourced a pair from a local parts shop. Having provided a numberplate/chassis number and part OEM part number, all results came back as the same coils on the system, so happy that the number was correct they were ordered and fitted the same day. Comparing the springs confirmed they were identical in size but didn't have the Audi coloured dots.

After having this work done the car started to feel loose. We investigated the work carried out and it all looked as it should. Nothing had come loose or was incorrectly fitted.

At this point i booked the car in with a local garage for a 4 wheel alignment, which was long overdue looking at the print out. However, during the alignment it was discovered that the rear bushes were shot and this prevented the rear being aligned.

2 weeks later, the car has gone back to the same garage for new rear arms (bushes couldn't be sourced individually) and the alignment was done correctly. The garage also checked all other joints, bushes and ARB's at my request and reported that all were fine.

This weekend thanks to the eased restrictions I have managed to use the car again, and it's still no better!

Obviously at this point I've spent a fair bit of time and money on this and can't figure out what the issue could be, so i'm hoping someone may have an idea of where to look next?
Any help/advice would be appreciated.
 
Did you source used or new shocks & tbh you need to either match the colours & part numbers for your chassis or a suitable aftermarket set, as used shocks are ways a risk tbh, that's if they are of course.
 
Did you source used or new shocks & tbh you need to either match the colours & part numbers for your chassis or a suitable aftermarket set, as used shocks are ways a risk tbh, that's if they are of course.
Brand new parts, I would never put used parts on the car, especially not suspension or brake components.
Parts were matched to the car using OEM part numbers to cross reference, and the numberplate/chassis number too.
I checked and double checked as i know there are several A3 platforms with different components fitted and didn't want the incorrect parts.
 
What tyres have you got fitted to the back, and more importantly, what pressures are you running?
 
What tyres have you got fitted to the back, and more importantly, what pressures are you running?
Uniroyal Rainsport 3.
Front 34 psi
Rear 38 psi
Changed last summer, done approx 5-6000 miles. Lots of tread, even wear. This is the second set of this tyre I've fitted all round so I don't think the tyre is a factor, it certainly wouldn't explain the sudden change months after they were fitted.
 
Uniroyal Rainsport 3.
Front 34 psi
Rear 38 psi
Changed last summer, done approx 5-6000 miles. Lots of tread, even wear. This is the second set of this tyre I've fitted all round so I don't think the tyre is a factor, it certainly wouldn't explain the sudden change months after they were fitted.

OK, but in my experience this is the #1 cause of complaints of poor handling. Those tyre pressures are the wrong way round for me. The heaviest part of the car is at the front (the engine) to I personally would put 38 up front and 34 at the back (36 if you carry passengers in the back). I agree, it's not going to solve your issue. Are you sure that the drop links on the back are OK as the bushes are known to fail?
 
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OK, but in my experience this is the #1 cause of complaints of poor handling. Those tyre pressures are the wrong way round for me. The heaviest part of the car is at the front (the engine) to I personally would put 38 up front and 34 at the back (36 if you carry passengers in the back). I agree, it's not going to solve your issue. Are you sure that the drop links on the back are OK as the bushes are known to fail?
I'll try lowering the rear tyre pressure, it might help. Thanks for the tip.
 
I've lowered the rear tyres to 34psi, and left the fronts just because they feel fine and I want to make minor adjustments so any difference is easier to spot.
On a quick test drive on local roads i feel a difference, but it's not significant. There's certainly more cornering grip, but the car is still very crashy over bumps, far more than i've noticed prior to the new parts being fitted. I still can't put my finger on the issue, but I'm confident that something isn't right with it. Very frustrating.
 
Hi Dave, my tyre pressures are set to 40/38 and it feels comfortable at this. I do find the rear can be tail happy at speed but think this is common on the S3 - the rear ARB helped settle this a little. Sorry I know this doesn’t help explain the handling of stock suspension but give the tyre pressures a change as a start.
 
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I run my prefacelift S3 with 39 psi in the front and 30 psi in the rear.

From what you are saying, I think the strange handling came after you fitted the rear springs and shocks.
Is the ride height much the same as before indicating the spring tension is fine?
That brings you to the shocks. Not genuine? Can you vouch for the quality of the parts? Whilst it will handle like a boat on a rough sea, have you tried removing them for a short test drive over a known road surface?
Also, did you tighten the lower bolt for the shocks when the car was on its wheels on the ground with at least one person sitting in the back? This makes the lower bush sit in the correct location so it’s not fighting the movement?
 
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That brings you to the shocks. Not genuine? Can you vouch for the quality of the parts? Whilst it will handle like a boat on a rough sea, have you tried removing them for a short test drive over a known road surface?
Are you suggesting removing the shocks and driving the car? [SHOCK EMOJI]

I think you need to double check the springs as these are easy to get wrong, especially if not bought from Audi directly. I had a set of rear springs via TPS and although the colour code looked correct they were an inch longer than my old ones - turned out they were from a A3 sport and not an S3. What's the ride height look like? Did you do a old and new side by side comparison?
 
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Are you suggesting removing the shocks and driving the car? [SHOCK EMOJI]

I think you need to double check the springs as these are easy to get wrong, especially if not bought from Audi directly. I had a set of rear springs via TPS and although the colour code looked correct they were an inch longer than my old ones - turned out they were from a A3 sport and not an S3. What's the ride height look like? Did you do a old and new
side by side comparison?

A very short, very slow test drive just round the block etc to see if the knocking disappears.
My money is that the new shocks coupled with the high rear pressures are causing it. Also possibly tightened the lower shock bolt with the wheel in the air?
Years ago I had new genuine VW rear shocks in my Mk 4 Golf and it was a bit crashy on uneven surfaces until they settled in.
 
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i must have to adjust my tyre pressures as i am running 42 front 38 back and going by what most off you are saying its not right , mine are PS4's all round . Cheers for the heads up lads
 
I ran two sets of PS4's on mine for over 30k miles - found a nice balance between comfort and handling at 38fr 34rr. No uneven tyre wear and took the edge off pot holes on ***** UK roads. The quoted tyre pressures on the filler cap are for smooth German roads or fully laden (5 ppl).
 
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Thanks for all the feedback guys, it's all appreciated.
The parts are brand new but not from Audi. All part numbers and VIN checks correlated to the same items so we did all we could to ensure they are correct, and I believe they are after comparing.
Ride height is different, but that could be due to completely knackered shocks and broken coils that were removed and the brand new stuff being put back on.
If i recall, the lower shock bolt was tightened whilst the rear was in the air and there was nobody in the car. This could be worth a look! That said, it had new arms and bushes just last week so I would hope the garage did this whilst aligning it all.
 
Thanks for all the feedback guys, it's all appreciated.
The parts are brand new but not from Audi. All part numbers and VIN checks correlated to the same items so we did all we could to ensure they are correct, and I believe they are after comparing.
Ride height is different, but that could be due to completely knackered shocks and broken coils that were removed and the brand new stuff being put back on.
If i recall, the lower shock bolt was tightened whilst the rear was in the air and there was nobody in the car. This could be worth a look! That said, it had new arms and bushes just last week so I would hope the garage did this whilst aligning it all.

It’s certainly worth slackening off the lower shock bolt and retightening with the car fully on the ground or on a 4 post ramp.
Even if it does not fix your issue it will prevent the lower shock bushes wearing out prematurely as they will try to almost turn if the bolt is tightened when the suspension is at max extension due to the arcing effect.
 
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We are hoping to fit a new thermostat and door lock module at the weekend, so I'll try and get that done at the same time.
Thanks again for the tip.
 
what brand are the new shocks/springs you installed?
Many manufacturers produce suspension parts for s3 but most of them will not be OEM quality because of the cost.
as an example Audi sells OEM shocks for around 650 euros in my country but I can still find shacks/koni/bilstein for a much better price and since I've tried those brands I mentioned I can tell you they're night and day compared to OEM shocks.
i drive an a3 but this is common problem on most VAG models.
I would suggest you go to local Audi dealers and order genuine shocks/springs and your car will be as new.
suspension is a mater of safety and the components we install should meet or exceed OEM quality
sorry for my English I hope that was helpful.
 
The car has been with an Ex VAG technician all day as he has kindly given up his saturday to replace the thermostat and fit a door lock module.
Whilst he had the car he inspected every bush and component and found no issues, so we can rule out worn/damaged parts.
So, that leads us back to the start, Springs and Shocks!
I have asked him to order the OEM rear springs and we will fit them at some point next week. This should hopefully rectify the problem and have the car driving as it should. If it doesn't then I'll get the OEM shocks and fit them too, but we are thinking that the springs are what's making the difference.
 
OK, but in my experience this is the #1 cause of complaints of poor handling. Those tyre pressures are the wrong way round for me. The heaviest part of the car is at the front (the engine) to I personally would put 38 up front and 34 at the back (36 if you carry passengers in the back). I agree, it's not going to solve your issue. Are you sure that the drop links on the back are OK as the bushes are known to fail?

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I looked at Bilstein website and can't even find the S3 in the drop down menu's.
In all honesty I want the car to behave like it used to, and the only way i know for sure that it will do that is to fit factory spec shocks and springs.
I'm not prepared to try the B8 shocks and discover that I don't get on with them and then need to buy yet another set.
 
just go for genuine Audi shocks from Audi dealer.No aftermarket parts.OEM only.
they are expensive but its the only way unless you go for Coilovers from a premium brand (Bilstein pss10,kw variant etc )
 
just go for genuine Audi shocks from Audi dealer.No aftermarket parts.OEM only.
they are expensive but its the only way unless you go for Coilovers from a premium brand (Bilstein pss10,kw variant etc )
Umm, I said that i was going to do that in the post above ;)