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Answer for your and my question is Ackermann-steering.
But Iīm not sure how it make the effect of oversteer or understeer... It is somehow related to angles how much front wheels are turned..... For example if you turn right all youīve got your left front wheel turns letīs say 20 degrees and your right wheel 30 degrees. There is secret of that. BUT this will only happen (if Iīm not completely wrong) when you have angled steering arms, not ones which are pointing straight front or back. (like 944īs are pointing straight front)
Cars which have straight (parallel) steering arms does not have Ackermann steering, because both wheels are turned same angles.
Then when you have angled steering arms, you can draw a line from lower ball-joint via steering-rod end so long that it will reach the carīs centerline. Then you draw same line from another side and then you look where does these lines cut. Is it front or back of the rear axle center or just at center of that. Then youīll have 'More', 'Less' or 'True' Ackermann.
I donīt know how these make effect. Iīve found no information from the web and no one havenīt explain me this thing either.
For example 944 have parallel steering arms pointing front. 914 / 911 have angled steering arms pointing back. Why is that???
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