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The caster settings are not the only things that change from model to model. The SAI changed dramatically from the 911 series to the 964/993 series. This was to be able to achieve a zero scrub radius on the 964, and later, a negative scrub radius on the 993.
This is the primary reason for the caster change, not the advent of power steering.
(SAI= steering axis inclination)
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'69 911E coupe' RSR clone-in-progress (retired 911-Spec racer)
'72 911T Targa MFI 2.4E spec(Formerly "Scruffy")
2004 GT3
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