Very few cars run with any real degree of toe out and it certainlly doesn't
help stability
A touch of toe in is more common as it does
help stability and helps cars turn in better.
particularly crucial on cars that wear the insides of tyres......
Soild cupra bushes for back of wishbone and poly fronts is the best starting point
Toe in only helps straight line stability, Toe out helps cornering. When a car accelerates generally on a straight road the car normally lifts which in turn has a slight affect on Toe out bring it in slightly. However you will find all racing cars and those who want good corning stability and turn in will use Toe Out on the front.
Search on the net for information. For e.g, Googles first hit:
"The toe setting on a particular car becomes a tradeoff between the straight-line stability afforded by toe-in and the quick steering response promoted by toe-out. Nobody wants their street car to constantly wander over tar strips-the never-ending steering corrections required would drive anyone batty. But racers are willing to sacrifice a bit of stability on the straightaway for a sharper turn-in to the corners. So street cars are generally set up with toe-in, while race cars are often set up with toe-out."
"If the car is set up with toe-out, however, the front wheels are aligned so that slight disturbances cause the wheel pair to assume rolling directions that do describe a turn. Any minute steering angle beyond the perfectly centered position will cause the inner wheel to steer in a tighter turn radius than the outer wheel. Thus, the car will always be trying to enter a turn, rather than maintaining a straight line of travel. So it's clear that toe-out encourages the initiation of a turn, while toe-in discourages it."
I agree a lot of cars are likely to use Toe In, but nowadays people are looking for good handling and a lot of these faster cars are more likely to be setup for cornering stability and turn in. After all, straight line speed will get you locked up easy these days where as if you can maintain a nice steady speed through the twisties while sticking to the limit it's much more fun
As as mentioned about the rear Toe settings which generally are Toe In: Most road going cars will Be Toe in at rear as must people can recover from Under steer.Toe out on the rear will induce over steer which many drivers have an issue wth.
"With four-wheel independent suspension, the toe must also be set at the rear of the car. Toe settings at the rear have essentially the same effect on wear, directional stability and turn-in as they do on the front. However, it is rare to set up a rear-drive race car toed out in the rear, since doing so causes excessive oversteer, particularly when power is applied. Front-wheel-drive race cars, on the other hand, are often set up with a bit of toe-out, as this induces a bit of oversteer to counteract the greater tendency of front-wheel-drive cars to understeer."
As I said, Toe Out provides better turn in, response etc which is how a lot of hot hatches/performances car's are set up which is a compromise between comfort and running costs.
Quotes from
http://www.ozebiz.com.au/racetech/theory/align.html
