Is X drive the same as haldex
Discussion
Monty Python said:
No - Haldex works as FWD until slippage occurs, then drive is sent to the rear wheels (at least in the case of Volvo). X-Drive is permanent with 40:60 front:rear split under normal conditions.
dododo said:
Unless I dreamt it I read on PH also that x-drive is electronic 4x4 rather than the mechanical version with haldex?
Well it can't be both, surely? Either it's part time or full time. So which is it?http://en.wikipedia.org/wiki/BMW_xDrive
BMW's current xDrive has a wet-plate central diff capable of adjusting the torque split between the front and rear. Normally, it's 60:40 R:F, but it can go to 100% either end. I s'pose you could call that "part-time"...
No, they don't buy it in from Haldex.
BMW's current xDrive has a wet-plate central diff capable of adjusting the torque split between the front and rear. Normally, it's 60:40 R:F, but it can go to 100% either end. I s'pose you could call that "part-time"...
No, they don't buy it in from Haldex.
I'm pretty certain x drive is considered permanent with a 40:60 F to R split and it can vary the amount between the front and rear axles depending on the amount of slip detected.
Haldex is primevally 2 wheel drive most common is front wheel drive and send power to the rear upon slip detected. It can be configured to be rear wheel drive and sending power to the front.
Which is better - not sure !
Haldex is primevally 2 wheel drive most common is front wheel drive and send power to the rear upon slip detected. It can be configured to be rear wheel drive and sending power to the front.
Which is better - not sure !
richs2891 said:
I'm pretty certain x drive is considered permanent with a 40:60 F to R split and it can vary the amount between the front and rear axles depending on the amount of slip detected.
Haldex is primevally 2 wheel drive most common is front wheel drive and send power to the rear upon slip detected. It can be configured to be rear wheel drive and sending power to the front.
Which is better - not sure !
Surely x drive?Haldex is primevally 2 wheel drive most common is front wheel drive and send power to the rear upon slip detected. It can be configured to be rear wheel drive and sending power to the front.
Which is better - not sure !
Monty Python said:
No - Haldex works as FWD until slippage occurs, then drive is sent to the rear wheels (at least in the case of Volvo). X-Drive is permanent with 40:60 front:rear split under normal conditions.
Haldex Gen 2 (which you refer to) is usually set up as a 90/10 or 85/15 (Audi) config and then sends torque to the rear as needed based on driveline slip. It is largely a traction aid.Haldex Gen 4 and 5 are different, and serve to improve dynamics as well as traction. The clutchpack is preemptively locked at 50/50 on acceleration or in sports driving, and driveline slip in this condition typically pushes the car into rear bias. Essentially, the systems function like the old Torsen 50/50s, but with better fuel economy for the times where the AWD does not need to be as active and the ability to transfer up to 100% of torque to either axle.
X drive is 40/60 and varies traction based on slip, and the latest versions are pretty good, but BMW does not offer a sport suspension on X-drive models.
scherzkeks said:
Haldex Gen 4 and 5 are different, and serve to improve dynamics as well as traction. The clutchpack is preemptively locked at 50/50 on acceleration or in sports driving, and driveline slip in this condition typically pushes the car into rear bias. Essentially, the systems function like the old Torsen 50/50s, but with better fuel economy for the times where the AWD does not need to be as active and the ability to transfer up to 100% of torque to either axle.
it can also torque vector by applying braking to individual wheels scherzkeks said:
Haldex Gen 2 (which you refer to) is usually set up as a 90/10 or 85/15 (Audi) config and then sends torque to the rear as needed based on driveline slip. It is largely a traction aid.
Haldex Gen 4 and 5 are different, and serve to improve dynamics as well as traction. The clutchpack is preemptively locked at 50/50 on acceleration or in sports driving, and driveline slip in this condition typically pushes the car into rear bias. Essentially, the systems function like the old Torsen 50/50s, but with better fuel economy for the times where the AWD does not need to be as active and the ability to transfer up to 100% of torque to either axle.
X drive is 40/60 and varies traction based on slip, and the latest versions are pretty good, but BMW does not offer a sport suspension on X-drive models.
Top quality post, chap.Haldex Gen 4 and 5 are different, and serve to improve dynamics as well as traction. The clutchpack is preemptively locked at 50/50 on acceleration or in sports driving, and driveline slip in this condition typically pushes the car into rear bias. Essentially, the systems function like the old Torsen 50/50s, but with better fuel economy for the times where the AWD does not need to be as active and the ability to transfer up to 100% of torque to either axle.
X drive is 40/60 and varies traction based on slip, and the latest versions are pretty good, but BMW does not offer a sport suspension on X-drive models.
The Nur said:
scherzkeks said:
Haldex Gen 2 (which you refer to) is usually set up as a 90/10 or 85/15 (Audi) config and then sends torque to the rear as needed based on driveline slip. It is largely a traction aid.
Haldex Gen 4 and 5 are different, and serve to improve dynamics as well as traction. The clutchpack is preemptively locked at 50/50 on acceleration or in sports driving, and driveline slip in this condition typically pushes the car into rear bias. Essentially, the systems function like the old Torsen 50/50s, but with better fuel economy for the times where the AWD does not need to be as active and the ability to transfer up to 100% of torque to either axle.
X drive is 40/60 and varies traction based on slip, and the latest versions are pretty good, but BMW does not offer a sport suspension on X-drive models.
Top quality post, chap.Haldex Gen 4 and 5 are different, and serve to improve dynamics as well as traction. The clutchpack is preemptively locked at 50/50 on acceleration or in sports driving, and driveline slip in this condition typically pushes the car into rear bias. Essentially, the systems function like the old Torsen 50/50s, but with better fuel economy for the times where the AWD does not need to be as active and the ability to transfer up to 100% of torque to either axle.
X drive is 40/60 and varies traction based on slip, and the latest versions are pretty good, but BMW does not offer a sport suspension on X-drive models.
The Nur said:
scherzkeks said:
Haldex Gen 2 (which you refer to) is usually set up as a 90/10 or 85/15 (Audi) config and then sends torque to the rear as needed based on driveline slip. It is largely a traction aid.
Haldex Gen 4 and 5 are different, and serve to improve dynamics as well as traction. The clutchpack is preemptively locked at 50/50 on acceleration or in sports driving, and driveline slip in this condition typically pushes the car into rear bias. Essentially, the systems function like the old Torsen 50/50s, but with better fuel economy for the times where the AWD does not need to be as active and the ability to transfer up to 100% of torque to either axle.
X drive is 40/60 and varies traction based on slip, and the latest versions are pretty good, but BMW does not offer a sport suspension on X-drive models.
Top quality post, chap.Haldex Gen 4 and 5 are different, and serve to improve dynamics as well as traction. The clutchpack is preemptively locked at 50/50 on acceleration or in sports driving, and driveline slip in this condition typically pushes the car into rear bias. Essentially, the systems function like the old Torsen 50/50s, but with better fuel economy for the times where the AWD does not need to be as active and the ability to transfer up to 100% of torque to either axle.
X drive is 40/60 and varies traction based on slip, and the latest versions are pretty good, but BMW does not offer a sport suspension on X-drive models.
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.
Edited by Scuffers on Tuesday 11th February 19:37
Scuffers said:
Except it's just marketing speak...
Handed 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.
Well it seemed very informative from the perspective of the ill-informed Handed 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.
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