Anybody's quattro "binding" getting worse? I am at 27K KM and it is BAD.
04-12-2005, 05:10 AM
#17
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Re: It is normal and, FYI, the rear diff is open.
So is it only the center diff that locks? And if that is the case, how does it lock. I was under the assumption that it electrically locked and that they were not clutch nor gear types (not Kaaz or Quaffe).
04-12-2005, 06:24 AM
#18
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Actually,,,,
If I'm not mistaken, not every version of Quattro functions the same.
Quattro I: open front diff, open center diff (manual lock), open rear diff (manual lock). No ABS when locked.
Full-time manually engaged four-wheel drive.
original Audi quattro
Quattro II: open front diff, torque sensing ("torsen") center diff, open rear diff (manually lockable), automatically unlocks when speed exceeds 15mph.
on the Audi S2/RS2, Audi S4, Audi S6 until '95
"Urquattro"
Quattro III: open front diff, torsen center diff (auto version: planetary gear center with electronically controlled multi-plate locking clutch), torsen rear diff.
Quattro IV: open front diff with Electronic Differential Lock (EDL), torsen center diff, open rear diff with EDL.
on all VW/Audi cars with longitudinally mounted engines, so A4/A6/A8 quattro, S4/S6/S8, RS4/RS6, Passat 4motion. Using the ABS/ASR sensors to detect slipping wheels (the EDL system).
Only Quattro that can simultaneously send power to all four wheels.
So that would make us (B5 S4's) "Quattro IV" which means the ABS/ASR sensors data is sent through the computer and then based on that info either locks the front, rear, or both. I am trying to find out how much of a difference in wheel speed is necessary for the EDL to start kicking in. Because of the 4wd truck-like feeling we get when we are making sharp turns, and the fact that I feel it more in the rear leads me to believe that it is not the front EDL locking, nor the center torsion, but instead the rear EDL kicking in. This leads me to think that the EDL system is set to look for a more conservative wheel speed difference in the rear when activating the locking diff.
Quattro I: open front diff, open center diff (manual lock), open rear diff (manual lock). No ABS when locked.
Full-time manually engaged four-wheel drive.
original Audi quattro
Quattro II: open front diff, torque sensing ("torsen") center diff, open rear diff (manually lockable), automatically unlocks when speed exceeds 15mph.
on the Audi S2/RS2, Audi S4, Audi S6 until '95
"Urquattro"
Quattro III: open front diff, torsen center diff (auto version: planetary gear center with electronically controlled multi-plate locking clutch), torsen rear diff.
Quattro IV: open front diff with Electronic Differential Lock (EDL), torsen center diff, open rear diff with EDL.
on all VW/Audi cars with longitudinally mounted engines, so A4/A6/A8 quattro, S4/S6/S8, RS4/RS6, Passat 4motion. Using the ABS/ASR sensors to detect slipping wheels (the EDL system).
Only Quattro that can simultaneously send power to all four wheels.
So that would make us (B5 S4's) "Quattro IV" which means the ABS/ASR sensors data is sent through the computer and then based on that info either locks the front, rear, or both. I am trying to find out how much of a difference in wheel speed is necessary for the EDL to start kicking in. Because of the 4wd truck-like feeling we get when we are making sharp turns, and the fact that I feel it more in the rear leads me to believe that it is not the front EDL locking, nor the center torsion, but instead the rear EDL kicking in. This leads me to think that the EDL system is set to look for a more conservative wheel speed difference in the rear when activating the locking diff.
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