AWD a lie?
#11
12-21-2005, 09:58 PM
RE: AWD a lie?
yea, wasent sure what kind of diff the center was... but front and back are open...
#12
12-21-2005, 10:01 PM
RE: AWD a lie?
Yes open diffs on the front and rear
I think its called EBD Electronic Brake Differential??
I beleive one of his wheels was spinning because he doesnt have ESP
EDIT: My bad its EDL
I think its called EBD Electronic Brake Differential??
I beleive one of his wheels was spinning because he doesnt have ESP
EDIT: My bad its EDL
#13
12-21-2005, 10:22 PM
RE: AWD a lie?
Audi's use a mechanical or helical center diff based on worm and pinion gears, not a viscous. It has a 2:1 bias ratio, meaning it's 50:50 power split with a 60:40 transfer in either direction. And it is a limited slip diff (LSD). the front and rear diffs are open diffs that rely on the brakes to limit spin(EDL, electronic differential lock). those of us with bad abs pumps no longer have EDL cause it uses the abs pump to regulate spinning. A vicsous center diff is based on clutch packs and viscous fluid. most of the other AWD cars use viscous diff. (subaru, mitsu). power transfer in either direction can be almost infinite. the more wheel spin, the tighter the differential locks up in a viscous unit. In a mech unit like the audis, it can only go what the gears are ratio'd for, so if the fronts are spinning but the reas have grip, the torsen can only send up to 60% power to the rear. a viscous could send 100% if it was setup that way. Stasis engineering sells an upgraded torsen center for the audi's with a 4:1 bias or 80:20 for like $500, it can send 80% of the power to the gripping wheels as opposed to the stock 60%.
#14
12-22-2005, 12:05 AM
RE: AWD a lie?
ORIGINAL: acvega
Audi's use a mechanical or helical center diff based on worm and pinion gears, not a viscous. It has a 2:1 bias ratio, meaning it's 50:50 power split with a 60:40 transfer in either direction. And it is a limited slip diff (LSD). the front and rear diffs are open diffs that rely on the brakes to limit spin(EDL, electronic differential lock). those of us with bad abs pumps no longer have EDL cause it uses the abs pump to regulate spinning. A vicsous center diff is based on clutch packs and viscous fluid. most of the other AWD cars use viscous diff. (subaru, mitsu). power transfer in either direction can be almost infinite. the more wheel spin, the tighter the differential locks up in a viscous unit. In a mech unit like the audis, it can only go what the gears are ratio'd for, so if the fronts are spinning but the reas have grip, the torsen can only send up to 60% power to the rear. a viscous could send 100% if it was setup that way. Stasis engineering sells an upgraded torsen center for the audi's with a 4:1 bias or 80:20 for like $500, it can send 80% of the power to the gripping wheels as opposed to the stock 60%.
Audi's use a mechanical or helical center diff based on worm and pinion gears, not a viscous. It has a 2:1 bias ratio, meaning it's 50:50 power split with a 60:40 transfer in either direction. And it is a limited slip diff (LSD). the front and rear diffs are open diffs that rely on the brakes to limit spin(EDL, electronic differential lock). those of us with bad abs pumps no longer have EDL cause it uses the abs pump to regulate spinning. A vicsous center diff is based on clutch packs and viscous fluid. most of the other AWD cars use viscous diff. (subaru, mitsu). power transfer in either direction can be almost infinite. the more wheel spin, the tighter the differential locks up in a viscous unit. In a mech unit like the audis, it can only go what the gears are ratio'd for, so if the fronts are spinning but the reas have grip, the torsen can only send up to 60% power to the rear. a viscous could send 100% if it was setup that way. Stasis engineering sells an upgraded torsen center for the audi's with a 4:1 bias or 80:20 for like $500, it can send 80% of the power to the gripping wheels as opposed to the stock 60%.
if you didn't pull that off multiple sites... then kudos my man...
but can you explain this specific situation? it's definitely piqued my interest
#15
12-22-2005, 03:57 AM
RE: AWD a lie?
man ..my audi quattro is sweet through the snow!!!!! not one problem..i was the only one going the speed limit
#16
12-22-2005, 05:04 AM
RE: AWD a lie?
^^^^^ i second that. we had an unexpected snow storm (it was called a snowricaine) Go figure, and everyone was all paniking except for the rest of the audi quattro owners on the road and of course the jeeps. i wasnt gettin stuck even with some not so new tires..
#17
12-22-2005, 12:07 PM
RE: AWD a lie?
ORIGINAL: CheckMyVitals
...i researched.... he's right... for what i could tell until i stopped looking around.
if you didn't pull that off multiple sites... then kudos my man...
but can you explain this specific situation? it's definitely piqued my interest
ORIGINAL: acvega
Audi's use a mechanical or helical center diff based on worm and pinion gears, not a viscous. It has a 2:1 bias ratio, meaning it's 50:50 power split with a 60:40 transfer in either direction. And it is a limited slip diff (LSD). the front and rear diffs are open diffs that rely on the brakes to limit spin(EDL, electronic differential lock). those of us with bad abs pumps no longer have EDL cause it uses the abs pump to regulate spinning. A vicsous center diff is based on clutch packs and viscous fluid. most of the other AWD cars use viscous diff. (subaru, mitsu). power transfer in either direction can be almost infinite. the more wheel spin, the tighter the differential locks up in a viscous unit. In a mech unit like the audis, it can only go what the gears are ratio'd for, so if the fronts are spinning but the reas have grip, the torsen can only send up to 60% power to the rear. a viscous could send 100% if it was setup that way. Stasis engineering sells an upgraded torsen center for the audi's with a 4:1 bias or 80:20 for like $500, it can send 80% of the power to the gripping wheels as opposed to the stock 60%.
Audi's use a mechanical or helical center diff based on worm and pinion gears, not a viscous. It has a 2:1 bias ratio, meaning it's 50:50 power split with a 60:40 transfer in either direction. And it is a limited slip diff (LSD). the front and rear diffs are open diffs that rely on the brakes to limit spin(EDL, electronic differential lock). those of us with bad abs pumps no longer have EDL cause it uses the abs pump to regulate spinning. A vicsous center diff is based on clutch packs and viscous fluid. most of the other AWD cars use viscous diff. (subaru, mitsu). power transfer in either direction can be almost infinite. the more wheel spin, the tighter the differential locks up in a viscous unit. In a mech unit like the audis, it can only go what the gears are ratio'd for, so if the fronts are spinning but the reas have grip, the torsen can only send up to 60% power to the rear. a viscous could send 100% if it was setup that way. Stasis engineering sells an upgraded torsen center for the audi's with a 4:1 bias or 80:20 for like $500, it can send 80% of the power to the gripping wheels as opposed to the stock 60%.
if you didn't pull that off multiple sites... then kudos my man...
but can you explain this specific situation? it's definitely piqued my interest
#18
12-22-2005, 06:38 PM
RE: AWD a lie?
on this specific occasion the front passenger side tire broke loose causing all the power to go to that wheel. Both rear tires were loose, so they were both spinning.
Im sure the quattro has its limits... going up a grass hill in a few inches of snow may not have been the best idea. A 4WD truck or SUV probably would have been more suited for that kind off application.
Im sure the quattro has its limits... going up a grass hill in a few inches of snow may not have been the best idea. A 4WD truck or SUV probably would have been more suited for that kind off application.
#20
12-22-2005, 06:56 PM
RE: AWD a lie?
are you sure about ESP only working when you are moving?? I dont know about the Audi's but it does function on my benz when its not moving. I had to turn it off to get it up the driveway when snow was on the ground becuase it prevents wheel slip and I needed to wheels to spin free to get it up the driveway. (It didnt help that the benz is rear wheel drive and has sport tires on it haha)