Difference between Traction Control sub-systems?
06-24-2003, 12:56 AM
#16
Rennlist Member
Thanks for the quick reply. I understand what you are saying about 'mutual exclusive' with LSD and ABD.
I don't have the factory literature for the 1999 so I would like to get the facts so I can pick the appropriate car for my desired use.
I don't have the factory literature for the 1999 so I would like to get the facts so I can pick the appropriate car for my desired use.
06-24-2003, 08:50 AM
#17
Burning Brakes
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</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by 993_996_enthusiast:
<strong>I searched this set and the 06-23-2002 postings for 'traction control' systems but need to clear up the limited slip differential issue for the 996. (I might buy a 996 for street and track)
On the 1999 USA Spec 996 two wheel drive, manual transmission model...
It is a fact that there was an option of ' traction control' officially called Automatic Brake Differential (ABD).
Was there a traditional 'limited slip differential' for this car? If so was it standard or an option?
I think SPR and some others are saying there wasn't any factory rear LSD for the normal US Spec street 996, ever. If that is true my choices within the 996 C2 fleet are; no special traction system, ABD, and PSM (starting MY 2000)?</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">Traction control (not ABD) was an option on the 1999 C2, I had it on my car. It included a LSD as part of the package. 1999 was the only year this was offered and IMHO it is the hot set-up for the track.
Karl
<strong>I searched this set and the 06-23-2002 postings for 'traction control' systems but need to clear up the limited slip differential issue for the 996. (I might buy a 996 for street and track)
On the 1999 USA Spec 996 two wheel drive, manual transmission model...
It is a fact that there was an option of ' traction control' officially called Automatic Brake Differential (ABD).
Was there a traditional 'limited slip differential' for this car? If so was it standard or an option?
I think SPR and some others are saying there wasn't any factory rear LSD for the normal US Spec street 996, ever. If that is true my choices within the 996 C2 fleet are; no special traction system, ABD, and PSM (starting MY 2000)?</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">Traction control (not ABD) was an option on the 1999 C2, I had it on my car. It included a LSD as part of the package. 1999 was the only year this was offered and IMHO it is the hot set-up for the track.
Karl
06-24-2003, 11:48 PM
#18
Rennlist Member
I have a 1999 with both Traction Control and the limited slip differential. I can't remember the option codes, but they are posted under the trunk lid on a paper sticker. It is a nice feature off the track too (especially in the snow).
06-24-2003, 11:54 PM
#19
Really? interesting mercedes is different I guess. I wonder if I have the limited slip since I have traction control also. I will have to run the options. Yeah if someone could post what that code was that would be great!
06-25-2003, 12:01 AM
#20
Burning Brakes
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Option code was 476. As I said earlier, if you have traction control on a 1999 996, you also have LSD. LSD came automatically and only if you ordered the traction control option.
Karl
Karl
06-26-2003, 05:33 PM
#25
Race Director
</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by Karl S:
<strong>Option code was 476. As I said earlier, if you have traction control on a 1999 996, you also have LSD. LSD came automatically and only if you ordered the traction control option.
Karl</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">Karl is absolutely correct. I have the traction control/LSD option on my car. The electronic traction control is defeatable by a dash mounted switch. It must be turned off (if that's what you want) each time you start the car, but stays off as long as the engine is running. For the street it's usually not intrusive but at the track I always turn it off as it has a tendancy to shut down engine power in low traction situations. With the electronic system off, the mechanical LSD is able to provide maximum possible traction at the rear without interupting power delivery.
<strong>Option code was 476. As I said earlier, if you have traction control on a 1999 996, you also have LSD. LSD came automatically and only if you ordered the traction control option.
Karl</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">Karl is absolutely correct. I have the traction control/LSD option on my car. The electronic traction control is defeatable by a dash mounted switch. It must be turned off (if that's what you want) each time you start the car, but stays off as long as the engine is running. For the street it's usually not intrusive but at the track I always turn it off as it has a tendancy to shut down engine power in low traction situations. With the electronic system off, the mechanical LSD is able to provide maximum possible traction at the rear without interupting power delivery.
06-26-2003, 09:16 PM
#26
Interesting I have the traction control but it doesn't say limited slip as I noted above just locking diff and active brake diff. or whatever. I guess locking diff is the same as limited slip in terms of the friction on the cones inside but has the electronic coupling like some air diffs for off roading to play with the traction control stuff electronics?
06-26-2003, 11:51 PM
#27
Rennlist Member
On the 1999 996 the Traction Control (TC) system is based on two features 1) The Automatic Brake Differential (ABD); 2) Anti-slip control system (ASR) ie torque reduction through DME engine intervention if both rear wheels begin to spin. The ABD is only active to 62.5 mph, above 62.5 mph the ABD does not intervene. The ASR is active at any speed unless the TC is switched off manually. Ref. PNA 499 921
Info from the Porsche dealer...
Option Code M222 = Traction Control System
Option Code M224 = automatic limited slip differential
Info from the Porsche dealer...
Option Code M222 = Traction Control System
Option Code M224 = automatic limited slip differential
06-27-2003, 02:04 AM
#28
Race Director
</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by StephenB:
<strong>On the 1999 996 the Traction Control (TC) system is based on two features 1) The Automatic Brake Differential (ABD); 2) Anti-slip control system (ASR) ie torque reduction through DME engine intervention if both rear wheels begin to spin. The ABD is only active to 62.5 mph, above 62.5 mph the ABD does not intervene. The ASR is active at any speed unless the TC is switched off manually. Ref. PNA 499 921
Info from the Porsche dealer...
Option Code M222 = Traction Control System
Option Code M224 = automatic limited slip differential</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">The mechanical LSD was also part of this package. The 1999 order guide dated November 18, 1998 (the time frame when I ordered my car)lists option code P72- Traction Control with ABD and Limited Slip Differential- for $1215.
<strong>On the 1999 996 the Traction Control (TC) system is based on two features 1) The Automatic Brake Differential (ABD); 2) Anti-slip control system (ASR) ie torque reduction through DME engine intervention if both rear wheels begin to spin. The ABD is only active to 62.5 mph, above 62.5 mph the ABD does not intervene. The ASR is active at any speed unless the TC is switched off manually. Ref. PNA 499 921
Info from the Porsche dealer...
Option Code M222 = Traction Control System
Option Code M224 = automatic limited slip differential</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">The mechanical LSD was also part of this package. The 1999 order guide dated November 18, 1998 (the time frame when I ordered my car)lists option code P72- Traction Control with ABD and Limited Slip Differential- for $1215.
06-28-2003, 01:50 AM
#29
Rennlist Member
Thanks folks for your interest and support. Looks like another Porsche AG option code puzzzzzle. So... from all of your comments here is my summary.
The USA spec 1999 Porsche 996 two wheel drive coupe with the "Traction Control" option has; locking differential, ABD, and ASR. The option code(s) supporting this vary depending on when the MY 1999 car was built.
ABD/ASR systems are a package; ABD uses brakes, ASR uses the engine computer (DME)
I think Porsche uses the term "locking differential xx%" and we USA folks use "limited slip differential" but they are the same darn mechanical thing. There is no evidence that one could buy just the locking differential from the order guide for this USA spec car.
It appears to me that they stopped using the 220, 224 option codes later in the 1999 production period and went with the P72 (Mike in LA). I am considering buying a 1999 which the salesman claims has traction control. He sent me the option codes and P72 is listed.
476 is used for PSM in model year 2001, and I have seen it mapped to "traction control" but without a model year specified. The only 996 year with traction control is 1999? cause 2000 and newer went to the PSM system.
From this set of postings the following have the "traction control" (with on/off switch) on their 1999 996 C2 but option codes vary.
Mark Wheeler 220 yes 222 no 224 yes 476 no P72 no
Karl S
SPR 220 yes 222 no 224 yes 476 no P72 no
Mike in CA
car I am ??? 220 no 222 no 224 no 476 no P72 yes
What do you think?
The USA spec 1999 Porsche 996 two wheel drive coupe with the "Traction Control" option has; locking differential, ABD, and ASR. The option code(s) supporting this vary depending on when the MY 1999 car was built.
ABD/ASR systems are a package; ABD uses brakes, ASR uses the engine computer (DME)
I think Porsche uses the term "locking differential xx%" and we USA folks use "limited slip differential" but they are the same darn mechanical thing. There is no evidence that one could buy just the locking differential from the order guide for this USA spec car.
It appears to me that they stopped using the 220, 224 option codes later in the 1999 production period and went with the P72 (Mike in LA). I am considering buying a 1999 which the salesman claims has traction control. He sent me the option codes and P72 is listed.
476 is used for PSM in model year 2001, and I have seen it mapped to "traction control" but without a model year specified. The only 996 year with traction control is 1999? cause 2000 and newer went to the PSM system.
From this set of postings the following have the "traction control" (with on/off switch) on their 1999 996 C2 but option codes vary.
Mark Wheeler 220 yes 222 no 224 yes 476 no P72 no
Karl S
SPR 220 yes 222 no 224 yes 476 no P72 no
Mike in CA
car I am ??? 220 no 222 no 224 no 476 no P72 yes
What do you think?