it kinda will but the EDL kicks in and stops the wheel spinning and effecivly feeds the power back to the wheels with grip.
Torsen isnt open. Its a locking diff.
The diffs in the axles are open though.
So if one front wheel loses traction, the entire axle in effect loses traction (until EDL does its thing)
If you floored it on some sheet ice, you'd spin up one front and one rear wheel, again until EDL tried to help out.
Torsen isnt open. Its a locking diff.
The diffs in the axles are open though.
So if one front wheel loses traction, the entire axle in effect loses traction (until EDL does its thing)
If you floored it on some sheet ice, you'd spin up one front and one rear wheel, again until EDL tried to help out.
are you sure -- i thought a normal Torsen "open" diff (as fitted to A4 quattro's) will send power to the wheel with the least grip
i.e in extreme conditions you can have one wheel spinning
I always feel safer with esp left on... however in the more mental conditions it wasn't any help at all... here is a thread I posted last year after an expedition to glenshee:
http://www.audi-sport.net/vb/showthread.php?t=67169
I was looking a month or so ago, but QJames persuaded me that I wouldn't need them!! BAH! FOOOL!!!!"
someone mentioned that the rear diff on a sport (quattro) was an LSD too
Not strictly true
rolling road goes faster than the mot rollers.!
quattro does not activate the rear diff untill approx 12mph
They wont put torsen quattro on 2 wheell MOT rollers as they will dammage the centre diff ! Either that v8 model you seen in the vw museum was an older version or its not running well. Torsen quattro will transmit drive equaly between the axles, only when the centre diff senses slip then it will transfer power between the axles.haldex is electrically activated, quattro is mechanically activated! thats what i have put above. rolling road goes faster than the mot rollers.!
Doing brakes and oil services ? You have 3 torsen diffs in a quattro, 2 built in the gearbox and the rear diff. If you said the front is driven 1st why the car wont move IF you remove the propshaft off the gearbox ? In a conventional quattro with locking diffs, you can do just that. As the diffs on the quattro are efectively open, you need slip for them to engage. Thats why you loose traction if you only have traction across the car 1 wheel per axle. The car will move nowhere. Now, you dont have no transfer box to switch from low to high range like in a proper 4x4. I found a good test on the net a few months ago wich compared different 4x4 including some haldex and some torsens...Let me find it !oh mate after 15 years workin on audis i know exactually what im talking about, its about time that this age old mith is put to rest all that is left for me to say is
byzan, if you have requested them not to put it on the rollers then they wouldnt do it anyway, you are correctt hey would use a decelerometer.
but do you think he has never done a quattro before, he must jnow that it can be rollered.
if by proper quattro you mean generation 1 it good to know that you have a ur quattro in working condition
there are about 4-5 different variations
Doing brakes and oil services ? :sign_unfair:QUOTE]
not everyone just does services, in fact us mastertechs barely do any at all!
i find that sort of comment very offensive!!!
you can research whatever you want on tinternet but that will not change the fact that if you put the car on a rolling brake tester the front wheels can move independently from the rear, (lets forget haldex, that is not 4 wheel drive until activated by the cntrol unit we all know that) if you have issues with this i suggest you look it up in official manuals and not by the old wives tales read on the net! IM BORED OF THIS NOW!
yes if you are on gravel and pulling away the car will be 4 wheel drive this is due to the forces acting on the diff. but in audi's development eyes the only true 4 wheel drive running gear setup as i know it is the Q7.
No mate, you dont understand your sentence. You are not driving the wheels of the cars with the engine you will drive them with the rollers, yes ? You keep stoping them in turn then you will just hear the EDS(diff lock) trying to stop the spinning wheel but the torque is not high enough to move the car forward. Spin the engine at 2000 rpm and you will hear and feel the centre Torsen diff locking up. You gave a bad example in the first place and dont forget the front diff on the Torsen audi is also an open viscous diff. You will do dammage by testing the brakes on 2wheel rollers thats why a good MOT garage will use an decelerometer to test brakes on these models. You must be one of them old school master techs -no offence mate but i have seen a big bunch of techs in dealers garages wich i wont trust them to wash me car let alone fixing it ! Your knowledge of the Audi marque might be beyond mine but i do know a thing or two about them and i dont call me a mechanic ! The Q7 is a propper 4WD as it has a low range box and locking diffs and its been perfected on the Cayene and Touareg. For a road going car the torsen quattro is the closest mechanical 4wd - without the use of locking diffs and transfer boxes - there is ! Read the last link i have posted and it might make you understand me statement !exactually aragon on rollers, handbrake on, turn front wheels and car will not try to lift off the rollers, as there is no torque across it! so this means that it is not 4 wheel drive at that particular moment, why do you think i put in my first post about confusing people that dont quite understand lol, because that would completely confuse them more