Hilton

Geoff, I believe any ABS unit from 86-89 will work outside North America.

PSD was only introduced in MY90, and the "s4 style" suspension and hubs was standard in all of '86 for most of the world.

Certainly my '89 has no PSD

BC

Worked for me. Yes - the hub diameter is different. But the radial and axial position of where the wheel sits on the spindle is the same - because the spindle is the S4 one, and the hub is for S4. We are NOT talking about putting the S2 hub onto an S4 spindle - thats clear, correct?

Made them a bit small, and carefully sanded it down until it went on hot onto a frozen hub. Worked fine. Just was too much at that time to deal with the wiring change or anything else that was required to go ALL S4 for the ABS. And there is no reason to really.

If someone is going to change wiring or sensors or ANY of that, they should be focusing on the computer and the pump - wire and plumb in newer technology - it means a world of difference according to the 944T turbo guys that have used Boxster and that kind of hardware.

BC

I miss being able to take those macro shots. Maybe I should buy a real camera again.

BC

So to be clear, I am talking about when someone owns an S2 928 with ABS. This is the 100+ tooth arrangement for the front hubs and the rear half-shafts (which is the bigger deal in some ways, depending on what is changing)

So this person buys an S4 front suspension to put bigger brakes on. But the S4 hubs have 60 teeth (most newer cars have less teeth - you would think one would want MORE teeth for more granularity)

I don't know if its would just work with the existing computer. Maybe. I didn't try that. I just put a ring on the S4 hub so I wouldn't lose ABS. And it worked fine. It needs to be an interference fit, but this is not the space shuttle (bad example - that thing is a box of parts built by the lowest bidder) - so some loctite never hurt anyone.

Done. No drama. It worked while I had that car together.

What I would like to do is put a much later ABS computer and pump with more circuits in. If its a different amount of teeth, the rear half shafts will be the more difficult project.

Dadddio

I'd be willing to give it a try.
Do you have the specs for the machining?
I would like to have some made.
Unless you would like to make them?
Your idea.
Are fronts and rears the same size?

Landseer

Yes, I stand corrected! Thought you had just dreamed it up, didn't realize you actually made it work.

Mine is an 84 Euro with ABS.
Now has 86.5 axles and front suspension. Old and new brains are on the workbench. Driving car without.

I need to finish the conversion of the ABS circuits and brain to the 86.5.
Have all the parts.

Mrmerlin

Thanks for answering this Brendan,
I knew Chis would consider this and there are also a few others that might chime in here

Maybach_Man

Hilton......you just dont know how much you just made my day

Geoff

BC

I dream many things up. Don't always do anything with them, and when I do, they don't always work. This worked fine.

Mrmerlin

Brendan I could use a set of these rings for my 85 Euro with S4 brakes and ABS, thanks
I know Chris (Daddio) and Chris (Landseer)could also use a set

Alan

The wiring & plug at the ABS module (before the switch to ABS/PSD combo module) appears to be exactly the same electrically - probably will work - but assume you need to modify the sensors for the new positions anyway.

Alan

BC

I am looking for the drawings.

Landseer

BC, any luck locating them?

This would be the perfect solution for another S2 I'm dealing with.

Neil Forn

It looks like you could machine the s4 hub to take early ring without too much difficulty. I'd want to see what the wall thickness is on the early hubs. I could do that with one setup on my mill with the rotary table. It would be much easier than making new rings with gear teeth.

Dadddio

I had the rings made.
Although not cheap, they work flawlessly.