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A few random points:
- There are a number of cars where the rear wheels are closer to the inside of the corner than the front wheels are in steady-state cornering. I've clipped curbs in my parents' 2nd-gen Rx-7 because of that, for instance.
- Adding FRONT track can help reduce understeer, except when the track increase gives you a scrub radius that is too large. (In this context, I mean the distance between the center of the contact patch and where the steering axis intersects the ground.) When you go too far out, the extra scrub radius adds to understeer and makes the car drive like a truck. You can correct that by changing the suspension geometry so that the steering axis point moves outward. Usually a 10mm increase in track (and 5mm increase in scrub radius) won't be enough to feel, though.
- It is possible that other mechanisms than the above result in a feeling of less understeer in a Fiesta when you add 5mm spacers to the rear.
-soD
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