MNZ

We look after a 996 Turbo that was converted to a race car by someone else. They have disabled the ABS and hence there is no brake distribution. We can fix the ABS situation, however I was wondering if a 996 CUP system would work and/or be an improvement on the stock turbo ABS?

Has anyone got any experience with this?

Viperbob1

996 Cup ABS can work but needs rewiring. Most likely as a race car they removed the MAF and the turbo ABS requires a HP reading sent by ECU that depends on the MAF. While motor will run fine on MAP, ABS freaks out. There is a tuner that programs ecu to send a false signal if you want to retain the turbo ABS.

MNZ

No this car still has MAF. They have removed some wiring and fuses and also steering angle sensor.

As I say it can be fixed, but is it worthwhile with stock ABS on track? Or is CUP system better?

powdrhound

All in all there is no comparison between the street and Cup ABS units. The Cup version is simply amazing and totally unflappable. No issues with ice mode or any of the other maladies that plaque the street units. Well worth the effort in getting it installed.

There is no need to mess with the MAF or ECU in any shape or form if you have someone that knows what they are doing. I had my 996TT ABS replaced with a 996CUP ABS on my car a couple of years ago. It does obviously require rewiring the ABS harness but other than that its plug and play using all OEM parts. The Cup ABS will work flawlessly but you will lose your speedometer and odometer info on your instrument cluster due to the fact that the street car (GT2/3/TT) ABS sends info to the cluster via CAN while the CupABS does so via K-line. I am using a Motec dash and we send all ABS info including failures directly into Motec so the loss of the stock dash speedo is a non issue and any ABS warnings pop up in Motec. Motec displays speedo and odometer info based on GPS.

MNZ

With a bit more work Today we have wired some items.
The only fault we currently have is due to steering angle sensor not being connected and currently the ABS is not operating. Just locks the front wheels.

So it would appear the stock ABS won't work without this.

coryf

http://www.bosch-motorsport.de/media...9151115pdf.pdf

If you end up deciding to upgrade. This is a better and easier solution than going with the 996 cup abs system.

al@cpt

Very few street car ABS systems work well on track as the calibration is not aggressive enough. The Bosch M4 kit is an excellent value and can be calibrated to your application. IMHO, this goes in the safety column of upgrades and will pay for itself quickly.

911racer

The 996 cup system is great. It works fairly stand alone. We have done several conversions. The 996 Cup system is great as Powdrhound has said. Completely unflappable. We currently have 3 996 cup ABS systems that we are converting for use with 997 cups. One is already spoken for. A converted harness and 996 cup unit would be included. You would not need special brake lines, since the bracket and lines are all in the same spot.

The only question that I can not answer is about the use of the current wheel speed sensors for other data like speed. Are you still using the stock dash for the car. On the 997 cup, the dash can be reconfigured to accept the change in signal.

Thanks

Ed

powdrhound

If converting a 996 Turbo, you will need all new brake lines that plug into the ABS unit as they are different. They are cheap though, about $100 for all 6 lines. The brake fluid reservoir needs to be changed also. The current wheel speed sensors are compatible.

MNZ

Some more info:

This car is RHD as we are in NZ, making the correct brake lines wouldn't bother us of course.
The car is still road legal, to allow use in Targa events, hence it still has the standard dash installed.
The car still has stock booster etc, we did contemplate the 997 bias master cyl setup, however we couldn't confirm it would fit RHD.
Current speed sensor are same part numbers as 996 CUP, having already checked this.

So essentially we can say:
996 CUP system can be made to work, but not with stock dash.
Bosch M4 is probably better and can also be made to work, but again not with stock dash?