[V6-12v] Understeer - suspension?

[James Whitehouse]

Ah, that would be a good scenario - I'd started imagining all sorts of
nightmare possibilities! It's easy for me to test that, actually, because my
FWD is exactly the same fitment and has all Michelin Primacys, so I can just
swap them over and see if things improve.

Cheers,
James


> -----Original Message-----
> From: v6-12v-bounces at audifans.com [mailto:v6-12v-bounces at audifans.com] On
> Behalf Of George Tur
> Sent: 29 December 2006 21:40
> To: v6-12v at audifans.com
> Subject: Re: [V6-12v] Understeer - suspension?
> 
> On Friday 29 December 2006 14:29, James Whitehouse wrote:
> 
> >
> > It's so bad that it's definitely worse handling than my FWD model. Now
> the
> > understeer could be tyre related, since the previous owner has premium
> > (Goodyear F1) tyres on the rear, and cheapo (Hankook, or some unknown
> > brand) on the front.
> *************
> James, that's your problem, you have mismatched tires. The torsen based
> quattro system is very sensitive to mismatched tires. The front and rear
> tires will have different slip/adhesion rates and the center torsen
> differential is going to react to it. Tires on a quattro based car have to
> all match.
> 
> I went through this some years ago with my wifes car. She had to replace
> the
> front tires on the A6 and even though she bought the same make they were a
> different model. When we drove that evening through a rain storm I
> couldn't
> drive the car over 50 miles an hour and had to take mild turns at very low
> speeds. After exchanging the tires the next day the handling returned to
> normal, which is mild understeer.
> 
> Regards
> 
> George
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