ABD

[Mark Elder]

The manual says ...(I know, I keep starting posts with this[8|])...anyway the manual say that the ABD green light comes on when it's active. I've not seen the green light (except during self test etc when I switch on).

So I assume I've not yet done anything to cause it to activate.

But I have had a few occassions, when accelerating hard out of roundabout in the wet, when I have lost traction and felt the car slide a little. I little less throttle and it corrects perfectly, but all without any sign of attention from the ABD.

I was expecting this type of manual correction to be unnecessary (until the ABD was beaten - but it does not seem to be trying).

I'm I just totally naive and should not be expecting it to help me in these cases?
When does it help?
(ABS definitely works, so I'd imagine the ABD must be too)
Perhaps I'm just too busy watching the road to see a little green light come on for a couple of milliseconds....

 

[38F3E1]

My understanding is that ABD is only there to stop wheelspins when pulling away from stationary and turns it self off over 40MPH. Therefore unless you are travelling at less than 40MPH when this happens you won't get any help.

It's also not a stability control system just a simple 'loss of grip in one wheel' wheelspin stopper. Nothing like those namby pamby systems that came later

Ian.

 

[Guest]

I was persuaded to specify a limited slip diff, rather than go for a 4 wheel drive 993 in 1996.
Was told that up to 40mph, performance was identical.

It never seems to cut in.

Regardss.

 

[fergusond]

Hi Mark, not an answer to your query, just another point of view, I have a C4 and have only seem the green ABD light on when standing on ice or in snow with the rear wheels spinning and the front pulling the car off. The rears take a lot of spinning before the light comes on. There is a description of what ABD does in the 'owners manual' but Ian's version is about right.

regards

David

 

[vic cohen]

Go somewhere safe , whizz it down te road in a situation that wud induce ABD and i the green light will flash on ur dials if its working .............well i think its green !

 

[Richard_Hamilton]

Or look for option code 224 on the sticker!

 

[burrow01]

Hi,

If it is a C4 then I think it has it as standard, if it is a C2, then it should be listed as an option on the underbonnet/Service book sticker - no sure what the option number would be. My copy of Peter Morgans "Original Porsche 911" lists it as 224, but with the caveat "Tiptronic Only"

Pete

Edit - Should have typed faster []

 

[Mark Elder]

Back in the winter I went to a hill where a river of ice had formed a river down left side of the road.

Positioned left wheels on ice and right on tarmac.

Hit the juice.

Green light comes on and car accelerates forward in dead straight line just like its a normal dry road in summer - amazing. (Then I got worried because I realised I should have maybe tested the ABS first!)

 

[IndischRot]

Does the ABD light come one when you first switch on the ignition? If yes it's probably fitted; if no then either the bulb's burned out or you haven't got ABD.

The other thing you can do is check the ABD/ABS control unit part number; it's in the left front of the luggage compartment by the spare.