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Join Date: Apr 2002
Location: Cambridge, MA
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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 07:34 AM..
Old 09-07-2017, 07:32 AM
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The only difference between the 964 & 993 control arms is that the pressed-in balljoint mounting stud is larger on the 993 arm.




Andreas
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Old 09-23-2017, 05:41 PM
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I have seen evidence from BVerburg that the lower longitudinals on the 993 have added strength
and negligible width where the mounts for the Aarms bolt up.
This added width I believe is where the 993 gains in wheel span ...Bert
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Old 09-23-2017, 06:00 PM
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Quote:
Originally Posted by budge96 View Post
I have seen evidence from BVerburg that the lower longitudinals on the 993 have added strength
and negligible width where the mounts for the Aarms bolt up.
This added width I believe is where the 993 gains in wheel span ...Bert
The 993 longitudinal push the front end out 12.5mm per side
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Old 09-23-2017, 06:23 PM
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