limited slip for 996s: is it possible and is it necessary?
06-24-2002, 08:14 PM
#1
Instructor
Thread Starter
Join Date: Feb 2002
Location: Boston, MA
Posts: 136
Likes: 0
Received 0 Likes
on
0 Posts
limited slip for 996s: is it possible and is it necessary?
am curious about this.
posted at the 996 mainpage and did not get an idea of why LSD is not standard on the 996? just curious.
does not seem like PSM would be all that great compraed to a true mechanical limited slip for track usage.
any input is appreciated!
posted at the 996 mainpage and did not get an idea of why LSD is not standard on the 996? just curious.
does not seem like PSM would be all that great compraed to a true mechanical limited slip for track usage.
any input is appreciated!
07-02-2002, 12:25 AM
#2
8th Gear
Join Date: Jul 2002
Location: Atlanta
Posts: 8
Likes: 0
Received 0 Likes
on
0 Posts
The reason the 996 doesnt have a mechanical lSD is because it used advanced traction controls that are linked with the ABS system.Based on the abs 5.3, traction control is a combination of the
-ABD[automatic braking Differential] similar to the 993
-ASR[drive slip control] ie, reduction in torque due to engine intervention on the spinning rear wheels on both sides,active over the whole speed range.
The ABD system works by monitoring the abs sensors and when it detects a differant speed it applies brake to the wheel that is spinning. By the addition of residual driving torque and braking torque a higher driving torque can therefore be transmitted to the non spinning wheel.
This is a very smart setup and has all the benefits of a open diferential without the downsides of a traditional mechanical limited slip. Sorry about the long message.
-ABD[automatic braking Differential] similar to the 993
-ASR[drive slip control] ie, reduction in torque due to engine intervention on the spinning rear wheels on both sides,active over the whole speed range.
The ABD system works by monitoring the abs sensors and when it detects a differant speed it applies brake to the wheel that is spinning. By the addition of residual driving torque and braking torque a higher driving torque can therefore be transmitted to the non spinning wheel.
This is a very smart setup and has all the benefits of a open diferential without the downsides of a traditional mechanical limited slip. Sorry about the long message.
07-03-2002, 10:36 PM
#3
Rennlist Member
Note that Porsche's more track oriented cars like the 996 GT2 and now defunct 996 GT3 do not have ABD traction control and use a regular LSD instead. This indicates to me how Porsche feels about ABD for track use.
07-12-2002, 12:47 AM
#5
8th Gear
Join Date: Jul 2002
Location: Atlanta
Posts: 8
Likes: 0
Received 0 Likes
on
0 Posts
Yeah all of the electronic traction control devices do add up to alot of weight. Especially if you look at a PSM equiped car, it has a large motor to apply brake pressure without your foot, not that this has anything to do with traction control but just thought that I would throw it out there.
Trending Topics
07-15-2002, 11:17 AM
#8
Addict
Rennlist Member
Rennlist Member
[quote]Originally posted by Luke:
<strong>Sloth,
Why the Sad face
? that's what I would want in a P car.</strong><hr></blockquote>
I like the lack of an electronic traction control, however, I do wish I had a mechanical LSD.
Other than that... nothing to do but smile, smile, smile.
<img src="graemlins/burnout.gif" border="0" alt="[burnout]" /> 
<strong>Sloth,
Why the Sad face
? that's what I would want in a P car.</strong><hr></blockquote>I like the lack of an electronic traction control, however, I do wish I had a mechanical LSD.
Other than that... nothing to do but smile, smile, smile.
<img src="graemlins/burnout.gif" border="0" alt="[burnout]" />
08-04-2002, 01:32 AM
#10
Three Wheelin'
y 1999 996 (C2) has a mechanical LSD and traction control. Coming from driving Audis for the last three cars, I had to make certain that I would have an LSD. I love being back in rear wheel drive.
