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There are lots of threads about installing 993 RS uprights (or the BBI/Elephant alternatives) on a 964, but I can't find any discussion of the standard 993 uprights.
I'm rebuilding the front suspension of a 964 Turbo (so the uprights already have radial brake mounts) and I'm thinking about using a set of 993 uprights instead of the 965 ones.
I know they don't offer any bumpsteer advantage, but they are way way lighter and have the 3-prong hubs which work easily with hubcentric spacers.
Has anyone done this? Can you use standard 965 ball joints and tie rods? Is the ABS ring a straight swap?
I have assembled the parts to do the same on a ‘91 turbo ,don't for see any real difficulty yes the ABS ring has to be swapped the 964 has a few less teeth .
I understand Cobalt has completed this on one of his race cars my opinion I plan on using the 993 uprights for strength , lightness and overall feel .
Yes the tie rod from the 964 can be used but why it’s weaker and has more rubber and a u joint , the 993 is stronger lighter and will last longer .
Yes the ball joint is the same part no gain there ..
thanks Bert
Also been reading some threads about top-mounting the balljoint on the control arm. In another genre of car that I have a lot of experience with (Mustang, ewww) - this small hack helped locate the control arm slightly lower in it's arch(close to what OE angle would be), resulting in improved bumpsteer specs.
Curious to learn what combo of longitudinals, mounting holes, ball joints and spindles you end up going with! Will be different for sure on WB vs NB but still some good info.
There's a thread on the other forum where @cobalt is asking about the same thing, but I couldn't find out if he'd come to some solution. http://forums.pelicanparts.com/porsc...r-993-hub.html
Looks like it might be possible to run the 993 upright but use the 964 wheel carrier and ABS ring, but not possible to use the 993 wheel carrier?
That's a shame, since half of what I was hoping to gain was the 3-prong wheel carrier on the 993 hub (vs the solid one that won't fit a lot of spacers on the 964 T)
I wish i had the time to get into this subject but it is involved and required a lot of custom fabrication. I have done many 993 upgrades on both my C2 and RSR track car. The RSR has 993 longitudinal's and RS or EVO uprights. This is a wide body build. So it uses the outboard top hat settings. I had to use a lot of ERP/Tarrett parts to make it work.
My C2 uses std 993 uprights, 993TT rotors and big reds (Black in this case). You have to use the 993 tie rods as well along with speeds sensors from the 993. I made a custom 964 RS style front bolt assembly by cutting the axle from a C4 cutting it at the CV joint. This gets complicated because for some reason they use a different setup for the C2 vs. the RS and the C4 front hubs.
The 964 C2 hub uses the tone ring washer on the left. All 993 and other 964's use the style on the right. The left unit centers the ring on the bolt and uses the inner race of the bearing to lock everything in place. The one on the right uses the hub itself and locks into the hub using the center shown. Hard to explain this early. 964 C2 front left, 993 C2 right.
This is actually a 993 front hub. Although the part number says 964 you can tell by the added bosses under the studs which have additional meat. As you can see the concave end is what the end of the right washer fits into and locks everything together. I used 993 hubs do to their greater strength.
This pic might be more helpful. 993 tone ring washer left. 964 C2 front tone ring washer right and a RS style setup I made from a 964 C4 front axle middle. I cut the end of the CV joint off and works perfectly but ruined a perfectly good axle.
Tone rings can be pressed off standard washers but are part of the axles for C4 front and both rears. 993 left 964 right
The other option is using the washers instead of cutting the axle. Here is a 993 washer with 964 tone ring installed. Using the standard bolt and the fabricated RS style I made.
C2 with 993 N/A upright installed.
You will need to use a 993 ball joint to make this work so no doubt they changed the hardware as well. As I recall it has been a while. You will need to modify the control arm to use the bolt for the 993 ball joint along with 993 tie rods. I recommend aftermarket since you are going this far and they will allow you to adjust toe in properly.
Sorry but I need to yell at my wife for serving me those Irish Coffee's last night.
PS: I believe the turbo and pic you posted shows the std 964 front setup which uses the bearing centered tone ring. I believe the C2 and turbo received the same front hubs. You can try to remove the bearing without damaging it but most of the time it is just best to replace. I also forgot i did use a 964 style front hub on the C2 the RSR received the 993 either will work. I have no room for spacers more than 3mm up front so it wasn't worth spending up for 993 front hubs on a street car.
Still not awake.
Contact me if you have specific questions.
Last one Blue meanie with RS uprights and 993 longitudinal. They push the front end out 12.5mm per side over the 964 version. I am also running a 9 and or 9.5" front wheel.
To the time-sert question: If you buy used 993 uprights it's better to assume you're going 'sert them all. Of the 8 pairs Ive worked with, every single set has stripped at least one caliper bolt upon removal.
Shameless plug, I have a set that are cert'd and vapor blasted with new bearings for sale. I'm motivated to sell them, make me an offer.
For the few and the proud running with 993 uprights and 993 longitudes on a 964 narrow body, what is the best wheel fitment and how wide a tire can you jam up front? Ideally 8.5” wide wheels with 245’s, if at all possible. See more details in my post in this 235/35 Thread.
A question just to understand. I did the "993RS setup" incl longitudes, but I re-used my 964 hubs. What is the real problem with that? I did this mod some +10 years ago and I almost only track my car and haven't noticed any problems at all.
03-16-2024, 11:00 PM
Standard 993 Uprights on 964 (965)
