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Join Date: Apr 2002
Location: Cambridge, MA
Posts: 402
964 vs 993 caster

I've been wondering about this one for a while, caster angle specs are:
964 4*25'
993 5*20'

Where does the 993 find the extra degree? Are the strut top mount holes in the tower moved further aft? Or is the difference down at the control arm? I believe that the rubber strut top mount is the same between models? Is it a product of geometry changes in the front track width due to the differences in the longitudinals?

Many 964s struggle to reach the factory caster spec, is there room to go beyond 5*20' in the 993?

Side note- I swapped my 964 steering rack to a 993 rack and the steering effort became noticeably lighter. I wonder if the 993 caster increase was partly, or wholly, to add weight to the steering feel on the 993 with the different rack.

Last edited by nickd; 09-07-2017 at 06:34 AM..
Old 09-07-2017, 06:32 AM
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