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Discussion Starter · #1 ·
I wonder if anyone has had a similar issue. I chatted to the head tech at my supplying dealer (not yet an R8 centre) at the weekend, and took him out with me, and he can feel the problem too... but after checking TSBs and speaking to the group's R8 centre, has no idea what the problem is...

Anyway, it started a couple of weeks ago. I noticed that the car seemed to feel 'buffeted', and originally put it down to the strong winds we had been getting. When they lessened, the problem was still there, and I focused on what it was doing, and discovered that the car was 'pulling', rather than being 'blown around'.

The first thing I did was check the tyres, and found that 1 of the tyres was seriously under pressure. I pumped it up, and parked up at home, but by the next day the tyre was 85% flat.

I replaced the tyre, and found it has a screw embedded in the treads.

A day or so later, to my surprise, I notice that the car is still not behaving properly. When I accelerate, the car seems to pull. Sometimes harder than others - sometimes just a little drift, other times it seems to dive. Worse still, when you back off the gas again, it corrects itself... so you can (by playing with the throttle) get the car to shimmy around. Obviously this has totally upset the balance of the car, and it really doesn't feel right. It is at its worst (of course) when making high-rev, high-speed gear changes, particularly on flowing roads - as when you back off the throttle to clutch, and then stamp on the gas again, the car ducks and dives around and unsettles itself. Not good.

I rechecked the tyre pressures at the dealership on Saturday, and they were out by maybe 2 psi in 1 tyre. We corrected this, and went for a drive, and it is the same as ever. You can feel it from the passenger seat nearly as much as when driving.

As the car will drive perfectly straight when you have neutral throttle input, I have effectively ruled out (in my mind) suspension, tracking, steering and (now) tyres. I'm thinking 'drivetrain' or the quattro / diffs - but VAGCOM threw up zero errors...

Audi want my car in later this week. They've offered to collect it tomorrow and replace with an A4, which I've declined... they can **** well do a bit better than that, if my £85k sports car is off the road, I'm not driving around in some £25k saloon car as a replacement.

So... has anyone else experienced similar? Please don't tell me it is a characteristic of the car!!! I truly hope not, but I'm certain it isn't, since I would have noticed in the first 500 miles, and would have felt the same problem at Rockingham when I drove them around the track for 1/2 a day.
 

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I'm wondering,
when was the last time you fueled up?
it could be that bad fuel was put in your car without you knowing,
that could definitely upset the balance and the nature of your car, especially during acceleration...
if this is the case, you would probably have to siphon out the gas and refuel, but that also causes your ecu you act up and may need resetting.

good luck.
 

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Discussion Starter · #3 ·
Interesting theory, but I've refuelled probably 3 or 4 times since the problem started (I fill the tank on a weekly basis) so its unlikely to be the cause.

I would also expect fuelling problems to give a dodgy ride on neutral throttle, and for the problem to be felt through the 'engine' rather than what feels like the chasis swaying...

interesting left-field idea, though...
 

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Is the replacement tire you put on an exact match for its mates in every respect? (obviously allowing that front and rear do differ)

If you're not sure it matches the (original factory?) tire on the opposite side, and nothing else obvious presents, I would put on a matched pair of replacement tires, on whichever end had the flat. On very sensitive suspensions, tire mis-match may produce strange handling behavior.
 

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Discussion Starter · #5 ·
Yep - replaced like for like, a Pirelli PZero R01 295/30/ZR19

The original had covered only 1000 miles, and I've covered probably 200 or so since, so a) not enough original miles for the replacement to be significantly different and b) enough miles since the replacement to bed-in the new one...
 

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It does sound like a tracking problem. I used to compete in stage rallying in an Escort Cosworth. Tracking problems were common due to the rough terrain , hitting rocks,clipping banks ,ditch hooking, etc. We had to reset the suspension geometry between events. The handling quirks you describe sound like the problems we'd have with the car late on in the day, Audi dealers have a laser system for aligning suspension on Quattro models . See if they will check your car out with that if it will fit.
 

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Need,s checking out-pos suspension /shock absorber problem BUT they do move about a fair bit during hard accelaration/gearchanges, You should try a R Tronic without lifting during hard acceleration.
 

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I had a similar problem when the rear tyre replaced was not an exact match. The car felt very dangerous to drive > 60 mph.. just felt I was driving on ice... and sweeping corners were scarey!

Anyway I replaced the tyre again for an exact match (purchased via Audi this time!) and the car now drives like a dream.

One other item to check... has the replacement wheel been balanced... ?
 

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Interesting theory, but I've refuelled probably 3 or 4 times since the problem started (I fill the tank on a weekly basis) so its unlikely to be the cause.

I would also expect fuelling problems to give a dodgy ride on neutral throttle, and for the problem to be felt through the 'engine' rather than what feels like the chasis swaying...

interesting left-field idea, though...
sometimes you have to think outside the box..hehe :D
of course that's not always right.
anyways, i hope you get this problem resolved asap...
and please update us.
 

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You can count yourself lucky that a replacement car is offered at all. Over here if I put my car in the service there are 2 choices: take the bus or the taxi!!!
 

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Yep - replaced like for like, a Pirelli PZero R01 295/30/ZR19

The original had covered only 1000 miles, and I've covered probably 200 or so since, so a) not enough original miles for the replacement to be significantly different and b) enough miles since the replacement to bed-in the new one...
Not to be tedious or to question your thoroughness, but since someone else raised the tire match issue also, I wanted to add a little more to my earlier comment about that:

You may have covered these points, but you don't mention it, so beside verifying the make, type and dimensions moulded on the sidewall, be sure the labelling on the tire is an exact match in every little detail. Also, you don't mention if they are the asymmetric PZero Rossos, but if they are, be sure the new tire is mounted with the correct orientation--the tread pattern should be a mirror image of the tire on the other side. Even if all that matches, you might actually measure the tire, just to be sure.

Please forgive me if I seem to belabor this point, but, as the other person who brought up tire match mentioned, I have experienced this and it can be a very sneaky way to upset the handling of sensitive cars. And your problem did begin with the flat tire and it's replacement. In the spirit of an old medical diagnostic aphorism: when things go wrong, look for one cause before you look for a second.
 

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Re: Car not driving right... :( try this...!

.... i have had similar handling problems of late....
and found that the tyre pressures are absolutly critical !
i made the mistake of running at 36 psi..... not the actual 39....
also tyres should be checked cold... all at the same time obviously
iv been told that a 4' difference of temp can effect the reading by 1psi...!
...im now running at all 39 psi which i check v regularly....
and the car seema better than ever.... hope this helps :)
 

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Discussion Starter · #14 ·
I will certainly get them to focus on the tyres first and foremost.

They're picking up from my work this morning, on a transporter, and bringing me a 5.2L V10 S6 instead.
 

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S6 is nice not bad! I don't think I will even get a A4 here.
 

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Discussion Starter · #17 ·
I'm now seriously pissed off with Audi.

They bought me an S5, not an S6...

But worst of all, they didn't bring a trailer. Fortunately for them (and in hindsight I wish I had been) I wasn't stubborn enough to send their guy packing - as, after all, it wasn't his fault - he was just the poor chap they sent to pick up my car.

So a car with a diagnosed HANDLING PROBLEM is now being driven about 50+ miles back to the R8 centre by someone who couldn't fathom either the electric parking brake on the S6, and seemed utterly confused by the R8 dealership.

I've already torn a strip off the chap at Audi (whilst sat with the driver) and followed up with a complaint to the R8 team.

How to piss off your customer, lesson #1.
 

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Discussion Starter · #19 ·
Tyre pressure,s should be39psi front---36psi rear not the same all round,--see the DATA sticker on the O/S door pillar.
The Audi tech at my supplying dealer agrees. I think 39 all round (not that I have the car to hand) is for optional winter tyres.
 
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