Does anyone have more detail on this issue and suggestions as to what we should do? We are concerned about the long term impact and if the problem goes away with a different wheel spec then we figure Jaguar should change the wheels as the ones it was sold with are clearly not correct for the vehicle.
At the heart of this effect is the front suspension geometry. You may recall hearing about Ackermann angles for steering geometry where the inner wheel turns further than the outer for a given movement of the steering wheel. No car has ideal Ackermann steering geometry because the size of the space under wings would have to be enormous to cope and/or front wheel tracks would have to be narrower. Similarly, the angles adopted influence how the steering feels at higher speeds.
Consequently, real life engineering is a compromise and manufacturers use lower Ackermann angles for better high speed cornering knowing that tyres have to absorb the forces of conflicting arcs in low speed, large lock movements. Especially when it's damp, very low profile tyres are known to cry, 'enough' and skip sideways releasing rather than absorbing the energy built up in the manoeuvre.
The choice is between a fine handling Jaguar with good high speed feel and grip and a less capable machine but one which doesn't 'skip' during car park manoeuvres. I know which I'd rather drive. Mike.
Keep up the good work.
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