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Hey all - since I used this and a few others threads to gather some great information for my suspension refresh, I wanted to share what I measured on my 94 964.
Changing the longitudinals alone creates a 16mm increase, per side. I know I've read 12.5 and a few other things. I know there are different long part numbers for 964, so maybe they aren't all the same - but in my case, I used a plumb bob and it was reasonably accurate.
The other thing to understand is that the 993 uprights, both RS and non-RS move the ball joint location, resulting in the hub of the wheel moving INBOARD by 8mm per side. so when you combine a 993 upright and a 993 long on a 964, it actually moves each wheel outboard by 8mm per side (16mm - 8mm).
This is also the reason that when swapping in 993 uprights only, people have trouble getting enough camber; the entire upright and strut assembly is pulled inboard by 8mm.
So you have the choice of 993 uprights and then maybe wheel spacer and add adjustable camber plates/maybe trim the towers a hair... or you can do 993 longs with 993 uprights for a total increase of 8mm per side...and this is pretty tight for most cars. 18x8 ET50 (popular) cars are already pretty close and I don't see this an easy move. Oleg, at the time had 7inch wheels so he might have had all the room in the world.
I'm going to modify a pair of 964 longs to see if I can get exactly in the right spot.
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