Jonte

I was looking at upgrading the ABS to a 4-channel system from a newer 997 or GT3 as I’m converting my car from a C4 to C2.

Has anyone done this?

is it as easy as simply doing the plumbing and rewire the connector?

koenig_roland

quite interesssted, because i am also in the process of C2 conversion.. :-)

Spyerx

http://www.bosch-motorsport.de/conte...188716299.html

So this is one of those, could it be done? Maybe with enough effort? The ABS in the street cars in 997 series are integrated into CAN bus. So, if you retrofit an ABS system they connect to the CAN bus and communicate with the ECU and other systems (like TC/PASM). From what I can tell on the C2, the ABS is basically stand alone from the rest of the other computers/motronic. So depending what inputs the 997 module wanted to see, it may not work.

you'd really want to consider a system like the new motorsport m5 clubsport stand alone ABS unit. These use a generic harness that cost a few k less than the full system that is more plug and play for newer cars. They are about $7k. The full unit is about 10k. I believe you need their software which is another 1k or so to finish programming and run bleed sequences on it.

The only thing is, I can't recall if the rear brakes are plumbed with 1 or 2 lines, so possibly you'd need to run new lines from the abs pump to support 4 channels. You could also consider something like a Tilton pedal box and master. Rothsport has done these on their cars. You then get a nice way to adjust bias.

The great thing about the motorsport ABS unit is they are in-cockpit adjustable. I seriously considered one of these in my 997RS but stopped tracking it.

Jonte

The motorsport one is very nice, but is a bit outside of the budget for what I’m trying to do.

the Can-bus connection is mainly for bleeding the system as far as I can tell unless it is a cup version where the settings can be changed. Is that the same view you have?

Goughary

Take a look at the build neinmeister did on the gulf RS tribute car. They did a four pole system there.

I wish there were an easy way to do this. Our brakes suck. Big time.

So if anyone wants to take up the challenge in a c4 to make a plug and play setup. I'm sure many of us would buy it in the end.

Spyerx

The issue you’ll have with a non programmable unit is adjusting it for our cars.
the m4 or m5 are adjustable for the car
they can run on can bus or stand alone.

Jonte

What I’ve found is that you can get a GT3 pump unit fairly inexpensive.

this one will require some rewiring and possibly a new set of wheel sensors. The 964 has VR sensors for the wheels while the 996 and beyond is Hall effect.

it sounds doable as long as the sensors fit.

Goughary

I'm pretty sure the system neinmeister used was 996.

I could see it being worked out for the C2...but I'd be interested in seeing it get worked out for the C4.

Jonte

Seems like a lot of people take the MK60 unit from the M3.

the 996 GT3 unit is an Bosch 5.3 unit which seems to be something used in almost every car at the time.

There is also a Bosch 5.7 unit that is a bit newer.

It does not seem to be a big thing to do the job, but it would be cool to find someone else who has done it.

spartansix

Ninemeister says they have done it (and will do it) but it requires taking your car to their shop... in England...

Jonte

What I've found is that the MK20 unit from the E46 is a simple 4-channel option.

It's standalone and uses VR sensors for the wheels just like 964 with the same tooth count.

Thoughts anyone?

spartansix

There seems to be a fair amount of discussion on putting E46 ABS systems into earlier cars, although the general consensus seems to be that the MK60 is a superior system for the track. No personal experience with it, but I wonder how it would interface with the existing PDAS and ABS systems...

Jonte

In my case the PDAS is going away since I’m replacing the G64 with a G50.

This is the whole reason why I’m looking at this.

the MK20 is a pump, valve and control unit that replaces the two units your normally have in the 964.

Peteinjp

What exactly would be necessary to install the mk20? Is the mk60 that much more involved?

I know we’d need another line to the rear brakes but not sure about the other sensors etc.

Pete

Jonte

The major difference is that the MK60 has Hall effect wheel sensors while the MK20 has VR.

The 964 has VR from factory.

You would need to rewire the main ABS connector and pull one more brake line converting from 3->4 channel.

Actually, I don’t think it’s more than that. I’m happy to be proven wrong though.