Quick question on Audi Quattro 4WD
Discussion
Just a quick one that's proving tricky to pin down using Google: A friend of mine's just got a brand new Q5 2.0TDi Quattro and he reckons it's rear wheel drive until extra grip is needed, then power is sent to the front. I thought modern Quattro systems were the other way around? Can anyone confirm? I'm also generally just interested in how it works, and how it compares in the RS models. Thanks.
The Haldex system fitted to my TT is according to wiki :
"The Haldex system automatically distributes power between the front and rear wheels depending on slippage, but normally sends 95% of the power to the front wheels."
So I would say front is given priority and your friend is wrong although I was under the impression 'Dynamic' driving mode selects a 60/40 front/rear split
"The Haldex system automatically distributes power between the front and rear wheels depending on slippage, but normally sends 95% of the power to the front wheels."
So I would say front is given priority and your friend is wrong although I was under the impression 'Dynamic' driving mode selects a 60/40 front/rear split
Zooks said:
The Haldex system fitted to my TT is according to wiki :
"The Haldex system automatically distributes power between the front and rear wheels depending on slippage, but normally sends 95% of the power to the front wheels."
So I would say front is given priority and your friend is wrong although I was under the impression 'Dynamic' driving mode selects a 60/40 front/rear split
Q5 uses a Torsen system as opposed to a Haldex system. "The Haldex system automatically distributes power between the front and rear wheels depending on slippage, but normally sends 95% of the power to the front wheels."
So I would say front is given priority and your friend is wrong although I was under the impression 'Dynamic' driving mode selects a 60/40 front/rear split
Can't verify the accuracy, but a fairly detailed explanation here:
https://www.carwow.co.uk/guides/glossary/audi-quat...
https://www.carwow.co.uk/guides/glossary/audi-quat...
annodomini2 said:
Fantastic, thank you. RobM77 said:
Just a quick one that's proving tricky to pin down using Google: A friend of mine's just got a brand new Q5 2.0TDi Quattro and he reckons it's rear wheel drive until extra grip is needed, then power is sent to the front. I thought modern Quattro systems were the other way around? Can anyone confirm? I'm also generally just interested in how it works, and how it compares in the RS models. Thanks.
Alternatively, you could just be pleased for him and play dumb, even though you ‘now’ know better...; )
I'm sure the new Q5 comes with the new Quattro on demand version of the system, if you go onto the configurator both the 2.0 TFSI and 2.0 TDI engines show the "Rear differential with uncoupling feature" under the safety & technology tabs but the 3.0 Tiptronic doesn't as this new version of the quattro system only works with engines producing less than 500Nm of torque.
I've got the new A5 coupe with the 2.0 Quattro engine but I've got the torsen system as only the TFSI engines have the on demand system for the A5 for some reason. I prefer the torsen system anyway like the idea of always on Quattro. I believe they market the on demand system as the quattro is on until it isn't needed, theres a youtube video of it in action.
I've got the new A5 coupe with the 2.0 Quattro engine but I've got the torsen system as only the TFSI engines have the on demand system for the A5 for some reason. I prefer the torsen system anyway like the idea of always on Quattro. I believe they market the on demand system as the quattro is on until it isn't needed, theres a youtube video of it in action.
My B7 S4 has the torsen centre diff which splits the drive 50:50 front and back. The B7 RS4 has the same torsen setup but biased to the rear, I think 60:40.
The smaller Audis which have transverse engines have the haldex system and are front wheel drive until loss of traction connects and drives the rear wheels.
The more modern cars are variations on the above and these work in conjunction with the traction control system to direct power to the wheel with more grip by braking the spinning wheel(s).
The smaller Audis which have transverse engines have the haldex system and are front wheel drive until loss of traction connects and drives the rear wheels.
The more modern cars are variations on the above and these work in conjunction with the traction control system to direct power to the wheel with more grip by braking the spinning wheel(s).
AudiSport said:
RobM77 said:
Just a quick one that's proving tricky to pin down using Google: A friend of mine's just got a brand new Q5 2.0TDi Quattro and he reckons it's rear wheel drive until extra grip is needed, then power is sent to the front. I thought modern Quattro systems were the other way around? Can anyone confirm? I'm also generally just interested in how it works, and how it compares in the RS models. Thanks.
Alternatively, you could just be pleased for him and play dumb, even though you ‘now’ know better...; )
Audi make it difficult to work out the quattro system, but this article advises.
http://www.caradvice.com.au/503284/2017-audi-q5-ge...
''The Audi Q5, however, uses a different version of the quattro system due to its MLB platform (MLB Evo for 2017 Q5) and longitudinal engine layout. The traditional torsen quattro system sends 60 percent of the drive to the rear axle, and 40 percent to the front making it a decidedly rear-biased system, under normal conditions.''
interesting sad fact for your friend is the MLBevo platform will be used by the Lambo SUV.
http://www.caradvice.com.au/503284/2017-audi-q5-ge...
''The Audi Q5, however, uses a different version of the quattro system due to its MLB platform (MLB Evo for 2017 Q5) and longitudinal engine layout. The traditional torsen quattro system sends 60 percent of the drive to the rear axle, and 40 percent to the front making it a decidedly rear-biased system, under normal conditions.''
interesting sad fact for your friend is the MLBevo platform will be used by the Lambo SUV.
dav_1991 said:
I'm sure the new Q5 comes with the new Quattro on demand version of the system, if you go onto the configurator both the 2.0 TFSI and 2.0 TDI engines show the "Rear differential with uncoupling feature" under the safety & technology tabs but the 3.0 Tiptronic doesn't as this new version of the quattro system only works with engines producing less than 500Nm of torque.
I've got the new A5 coupe with the 2.0 Quattro engine but I've got the torsen system as only the TFSI engines have the on demand system for the A5 for some reason. I prefer the torsen system anyway like the idea of always on Quattro. I believe they market the on demand system as the quattro is on until it isn't needed, theres a youtube video of it in action.
Agree with you about the torsen system best. I would deselect that box if I could do as they are ruining proper Quattro with this move. In extreme low grip situations like snow no torque transfer system is quick enough. They are now basically making proper Quattro as bad as bad as haldex.I've got the new A5 coupe with the 2.0 Quattro engine but I've got the torsen system as only the TFSI engines have the on demand system for the A5 for some reason. I prefer the torsen system anyway like the idea of always on Quattro. I believe they market the on demand system as the quattro is on until it isn't needed, theres a youtube video of it in action.
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