Is X drive the same as haldex
Discussion
Haldex is often dismissed on pistonheads as inferior; usually by those who have never used it. Aftermarket upgrades are also available that alter the bias for better balance/dynamics but at the cost of fuel economy.
Haldex 4wd is far better than any fwd, and a lot of rwd setups; but you have to adapt your driving style to get the most from it.
Haldex 4wd is far better than any fwd, and a lot of rwd setups; but you have to adapt your driving style to get the most from it.
Test driver said:
Haldex is often dismissed on pistonheads as inferior; usually by those who have never used it. Aftermarket upgrades are also available that alter the bias for better balance/dynamics but at the cost of fuel economy.
Haldex 4wd is far better than any fwd, and a lot of rwd setups; but you have to adapt your driving style to get the most from it.
That will be why on their flagship cars, Audi use torsen IIIHaldex 4wd is far better than any fwd, and a lot of rwd setups; but you have to adapt your driving style to get the most from it.
Haldex is used cause its cheap and easy to integrate on a fwd platform.
jaynana said:
Here is Borg Warners' detailed explanation of how generation 5 haldex works describing it as an electro-hydraulic clutch that is pre-memtive and immediate response enabler for disconected drivetrains.http://www.youtube.com/watch?v=fJeDgYHJjvs
And here showing how it works on the road.
http://www.youtube.com/watch?v=XZileWxZXbQ
jaynana said:
So X-drive has a transfer mech attached to the side of the gearbox(?), unequal-length front driveshafts, and an offset front diff?I thought they'd nicked the proper AWD design from the Range Rover, or was that just the X5?
Edited by Orangecurry on Wednesday 12th February 11:36
MaximumJed said:
The first X5 was basically the same as the Range Rover, parts could be swapped between the two. However, that wasn't branded as X-Drive. When they brought out X-Drive on the X5, they moved to an electronic system and presumably moved away from the Range Rover system.
That's an interesting random fact. I always thought the X5 was slagged of for zero off road ability but never heard anyone say similar of Range Rovers.MaximumJed said:
The first X5 was basically the same as the Range Rover, parts could be swapped between the two. However, that wasn't branded as X-Drive. When they brought out X-Drive on the X5, they moved to an electronic system and presumably moved away from the Range Rover system.
X5 uses an NV125 (or BMW copy of) transfer case, early ones were just mechanical diffs, later ones have an electrically operated clutch pack across the diff (to act like an LSD)
£ series (E46) have NV124's, similar to NV125 but gear transfer not chain, with a 38/62 static torque split.
both these are 'real' full time 4wd systems with centre diffs.
Herman Toothrot said:
Yes but its the same 4x4 system so alter tyres and suspension and away you go (I am asking, sounds like it had more in common, lots of interchangeable parts)?
As said, somewhat more to it than that..Like axle design, diffs in the axles, wheel travel, arbs, tyres, etc....
Scuffers said:
Except it's just marketing speak...
Haldex is a clutch, and as such, cannot torque split as such, all it can do is join the front and rear axles together (with a variable degree of slip toothed rear)
A differential can deal with front and rear axles at different speeds
To try claim otherwise is just showing mechanical ignorance.
Even if it is a clutch, if the clutch is fully engaged and both axles are on the same surface, then there will be a 50:50 torque split (or however it is geared). It will remain 50:50 with an engaged clutch unless one axle is on mush in which case that axle will get (about) 0% of the torque and the other axle will get 100%.Haldex is a clutch, and as such, cannot torque split as such, all it can do is join the front and rear axles together (with a variable degree of slip toothed rear)
A differential can deal with front and rear axles at different speeds
To try claim otherwise is just showing mechanical ignorance.
creampuff said:
Scuffers said:
Except it's just marketing speak...
Haldex is a clutch, and as such, cannot torque split as such, all it can do is join the front and rear axles together (with a variable degree of slip toothed rear)
A differential can deal with front and rear axles at different speeds
To try claim otherwise is just showing mechanical ignorance.
Even if it is a clutch, if the clutch is fully engaged and both axles are on the same surface, then there will be a 50:50 torque split (or however it is geared). It will remain 50:50 with an engaged clutch unless one axle is on mush in which case that axle will get (about) 0% of the torque and the other axle will get 100%.Haldex is a clutch, and as such, cannot torque split as such, all it can do is join the front and rear axles together (with a variable degree of slip toothed rear)
A differential can deal with front and rear axles at different speeds
To try claim otherwise is just showing mechanical ignorance.
If the clutch is 100% closed, then you have no torque split, the shafts are locked together.
Actual torque each shaft will then be down to how much grip each axle has, irrespective of what the other axle has.
Seriously, you need to understand some basic mechanical principals, this is not rocket science
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