Originally Posted by AussieXFire
My Xfire does this and my previous car did this as well, a Peugeot 206cc, which had low profile wide tyres.
My other car is the exact opposite, a 1980 Citroen with Diravi steering, which is self centering hydraulic, I've read reports that you can have a front blowout at 100+ kms/hr(60 m/hr), and the car won't even pull to one side.
Terry
The reason for the steering 'hunt' is usually to do with the how far offset the 'king pin' axis is compared with the centre of the tyre contact patch. Since we don't have king pins these days it will be the centreline of the McPherson strut or in our case the line through the upper and lower ball joints. The more offset there is the greater the amount of influence any wheel deflections have on the steering - it all come down to leverage.
Citroen made a big thing of this on the GS (the DS et al may have been the same) as this had the steering axis directly through the centre of the tyre so that the forces either side of the steering axis were equal irrespective of what happened to the tyre. I seem to recall a TV ad in the 70's/80's showing a GS having a blowout at high speed and just carrying on in a straight line!