Quote:
Originally Posted by Cobalt
So I am trying to digest this and from someone who has done most of this already you have me a bit confused.
The 993 and 964 ABS has no compatibility if it was originally 964 you will need to replace the tone rings and pickups I see since you already have 993 fronts I must assume if they changed to multi link the same goes for the rear.. I don't recall the exact count but I believe the 964 has 52 vs 54 teeth for the 993. Then you will need to plumb a line for the 993 four channel ABS vs the 964's 3 channel system. The 964 RS came with a 25.4mm MC and the C4 a 23.81 At least the one I removed from my 90 C4 was. Replacing with the larger 25.4MC requires adapters and the cost is crazy these days it was $500 a few years back they are over $1000 today.
You will need to rewire your existing harness and you can purchase the correct connectors to use with the 993 ABS unit but it will be work.
These projects are far more complicated than most can imagine.
GL
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Hi Cobalt,
Thank you for your advise.
Complete 993 Undercarriage:
Yes. Essentially I’m on a full 993 setup, w the 964 C4 parts removed.
Full 993 undercarriage (front and rear) and on a G50 6-speed w LSD.
So the rear shaft having the 993’s teeth count, but I believe the front is a 964’s teeth count as the front arm were the damaged 964 C4 arms (with modified 964 coupling, since the
964 C4 transmission was removed & swapped with the 993 C2 G50 6-Speed).
Electro-Hydraulic ABS System:
And yes. I believe the 964 C4 is on the hydraulic ABS setup & so is the 993 RS (as opposed to the C2 Vacuum setup).
My entire harness is in very bad shape, and I chanced upon a used 993 C4S harness.
So I’m wondering if anyone has successfully plug-&-play the below “993 RS Setup”,
on a 993 C4S, or plug-&-play on the
993 C2.
Hence I intend to change the full ABS setup to 993 RS.
- ABS Control Unit 993.618.127.00: I have purchased that.
- Master Cylinder 993.355.903.00 (25.4mm bore): I am still sourcing, as I’m currently on 964.355.025.52 (20.4mm bore).
- ABS Hydraulic Pump 993.355.955.50: I am still sourcing, as I’m currently on 964.355.955.00 (4 Channel w LSD).
Question: With that, could you share if you successfully fit the RS ABS System, on a 993 C4S or C2 harness?
Sorry to trouble you for advice.